Dihydroxypropyl-Terminated Polysiloxane Modified UV Cure Water-Borne Polyurethane

2011 ◽  
Vol 197-198 ◽  
pp. 1281-1284 ◽  
Author(s):  
Sui Lian Luo ◽  
Chao Dong Liu ◽  
Guo Fei Gong
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Water Resistance ◽  
Improve Water Resistance ◽  
Water Borne

In this paper three kind of water borne polyurethane are synthesized. FTIR identify the structure of 2-hydroxypropyl acrylate terminated water borne polyurethane with block PDMS. It is found that Si-WPUA has excellent water-resistance, good toughness, and good tensile strength. So, the work has been found the method which could improve water resistance and not decrease mechanical properties. It is hoped that the modified polyurethane could be used as coatings superior to the solvent-borne systems.

scholarly journals Bio-Based Thermoplastic Starch Composites Reinforced by Dialdehyde Lignocellulose

Molecules ◽  
2020 ◽  
Vol 25 (14) ◽  
pp. 3236
Author(s):  
Peng Yin ◽  
Wen Zhou ◽  
Xin Zhang ◽  
Bin Guo ◽  
Panxin Li
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Tensile Strength ◽  
Water Resistance ◽  
Thermoplastic Starch ◽  
Contact Angles ◽  
Sem Images ◽  
Elongation At Break ◽  
Injection Process ◽  
Oxidation Damage

In order to improve the mechanical properties and water resistance of thermoplastic starch (TPS), a novel reinforcement of dialdehyde lignocellulose (DLC) was prepared via the oxidation of lignocellulose (LC) using sodium periodate. Then, the DLC-reinforced TPS composites were prepared by an extrusion and injection process using glycerol as a plasticizer. The DLC and LC were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the effects of DLC content on the properties of the DLC/TPS composites were investigated via the evaluation of SEM images, mechanical properties, thermal stability, and contact angles. XRD showed that the crystallinity of the DLC decreased due to oxidation damage to the LC. SEM showed good dispersion of the DLC in the continuous TPS phase at low amounts of DLC, which related to good mechanical properties. The tensile strength of the DLC/TPS composite reached a maximum at a DLC content of 3 wt.%, while the elongation at break of the DLC/TPS composites increased with increasing DLC content. The DLC/TPS composites had better thermal stability than the neat TPS. As the DLC content increased, the water resistance first increased, then decreased. The highest tensile strength and elongation at break reached 5.26 MPa and 111.25%, respectively, and the highest contact angle was about 90.7°.

scholarly journals Karakteristik Bioplastik dari Pati Buah Lindur (Bruguiera gymnorrizha)

2018 ◽  
Vol 7 (1) ◽  
pp. 49-59
Author(s):  
Johan Budiman ◽  
Rodiana Nopianti ◽  
Shanti Dwita Lestari
Keyword(s):  
Mechanical Properties ◽  
Weight Loss ◽  
Tensile Strength ◽  
Degradation Rate ◽  
Water Resistance ◽  
Block Design ◽  
Percent Elongation ◽  
Starch Concentration ◽  
Randomized Block Design ◽  
Biodegradation Test

This research studied the characteristics of bioplastic from large-leafed mangrove (Bruguiera gymnorrizha) starch. This research was arranged used Randomized Block Design (RBD) model, with different starch concentration (0.5%, 1%, 1.5% and 2%) as treatment. The parameters observed were mechanical properties (tensile strength and percent elongation), thickness, water uptake and biodegradation test. The result showed that the starch concentration was not significant, (P>0.05) affected tensile strength and water resistance. Different between treatments was observed as for elongation, thickness and biodegradation test significant (P<0.05). The results obtained from the bioplastic research of large-leafed mangrove starch for tensile strength ranged from 24.59 MPa – 32.91 MPa, percent elongation 2.93% – 4.88%, thickness 0.05 mm – 0,11 mm, water resistance 108.06% – 111.09% and biodegradation test with percent weight loss 17.91% – 54.40% with the highest degradation rate 18.13 – 3.62 mg /15 days burial. The best treatment was obtained by using 1,5% starch, 4 g chitosan and 15% glycerol or equal to starch : chitosan 1.5 g : 4 g and 0.9 mL glycerol.

scholarly journals PENGARUH PENAMBAHAN PLASTICIER GLISEROL TERHADAP KARAKTERISTIK HIDROGEL KITOSAN-GLUTARALDEHID UNTUK APLIKASI PENUTUP LUKA

2014 ◽  
Vol 14 (1) ◽  
pp. 18 ◽  
Author(s):  
Djony Izak Rudyardjo
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Acetic Acid ◽  
Surface Structure ◽  
Wound Dressing ◽  
Water Resistance ◽  
Glycerol Concentration ◽  
A Value ◽  
Glutaraldehyde Solution ◽  
Hydrogel Surface

PENGARUH PENAMBAHAN PLASTICIER GLISEROL TERHADAP KARAKTERISTIK HIDROGEL KITOSAN-GLUTARALDEHID UNTUK APLIKASI PENUTUP LUKA ABSTRAK Telah dilakukan penelitian untuk mengetahui pengaruh penambahan plasticizer gliserol terhadap karakteristik hidrogel kitosan-glutaraldehid untuk aplikasi penutup luka. Penambahan gliserol bertujuan agar hidrogel kitosan-glutaraldehid lebih fleksibel dan memiliki sifat mekanik yang baik sehingga dapat diaplikasikan sebagai penutup luka sesuai dengan standar yang ada. Pembuatan hidrogel dilakukan dengan cara mencampurkan kitosan yang dilarutkan dalam 1% asam asetat dengan 1% larutan glutaraldehid pada perbandingan 50 : 3 (v/v) dan ditambahkan gliserol dengan variasi volume 1 ml – 4 ml. Konsentrasi gliserol yang digunakan tidak lebih dari 2%. Berdasarkan penelitian yang telah dilakukan, penambahan gliserol menyebabkan ketebalan, kuat tarik, dan kemampuan mengabsorbsi cairan hidrogel menurun; elongasi dan ketahanan terhadap air  hidrogel meningkat; serta struktur hidrogel menjadi lebih halus. Berdasarkan hasil uji sifat mekanik, hasil terbaik ditunjukkan oleh hidrogel kitosan-glutaraldehid-gliserol dengan penambahan gliserol 2% sebanyak 2 ml, yang memiliki nilai kuat tarik sebesar 14,34 ± 1,90 MPa dan elongasi sebesar 2,40 ± 0,91% yang memenuhi standar sifat mekanik kulit manusia. Struktur permukaan hidrogel tersebut halus, homogen, memiliki ketahanan terhadap air sebesar 24,78 ± 6,57% serta mampu mengabsorbsi cairan lebih dari 99,9% yaitu sebesar 149,65 ± 22,46% yang merupakan karakteristik penting hidrogel. Jadi, dapat disimpulkan bahwa hidrogel kitosan-glutaraldehid-gliserol dengan penambahan gliserol 2% sebanyak 2 ml dapat diaplikasikan sebagai penutup luka. Kata kunci: Glutaraldehid, Gliserol, Hidrogel, Kitosan, Penutup Luka, Plasticizer   THE EFFECT OF ADDITION GLYCEROL AS PLASTICIER TO THE CHARACTERISTICS OF CHITOSAN-GLUTARALDEHYDE HIDROGEL FOR WOUND DRESSING APPLICATION ABSTRACT The research had been done to determine the effect of addition glycerol as plasticizer to the characteristics of chitosan-glutaraldehyde hydrogel for wound dressing application. The addition of glycerol was served to increase flexibility and improve the mechanical properties of chitosan-glutaraldehyde hydrogel that can be applied as a wound dressing accordance with existing standards. Preparation of hydrogel was made by mixing chitosan dissolved in 1% acetic acid with 1% glutaraldehyde solution with ratio 50 : 3 (v/v) and added by glycerol with variation of 1 ml - 4 ml. The glycerol concentration used no more than 2%. Based on the research that had been done, the addition of glycerol caused thickness, tensile strength, and the absorption ability of hydrogel was decreased; elongation and water resistance of hydrogel increased; and the surface structure of hydrogel is more smooth. Based on the result of mechanical properties, the best characteristics of chitosan-glutaraldehyde-glycerol hydrogel is shown with the addition of 2 ml glycerol 2% composition which has a value of tensile strength of 14,34 ± 1,90 MPa and elongation at 2,40 ± 0,91 % that meet the standards of the mechanical properties of human skin. The structure of that hydrogel surface is smooth, homogeneous, has a water resistance of 24,78 ± 6,57%, and is able to absorb liquid more than 99,9% in the amount of 149,65 ± 22,46 % which is an important characteristic of the hydrogel. So, the chitosan-glutaraldehyde-glycerol hydrogel with the addition of 2 ml glycerol 2% can be applied as a wound dressing. Keywords : Chitosan, Glutaraldehyde, Glyserol, Hydrogel, Plasticizer, Wound Dressing

Dry-Process Hardboards from Recycled Newsprint Paper Fibers

1992 ◽  
Vol 266 ◽  
Author(s):  
Andrzej M. Krzysik ◽  
John A. Youngquist ◽  
James M. Muehl ◽  
Roger M. Rowell ◽  
Poo Chow ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Mechanical Strength ◽  
Water Resistance ◽  
Wood Fiber ◽  
Strength Properties ◽  
Dry Process ◽  
Paper Fibers

AbstractDry-process hardboard represents a favorable option for recycling old newspaper fibers. However, dry-process boards tend to be less dimensionally stable than boards processed by other methods. Our objective was to determine the effects of various wood fiber (WF) to old newspaper (ONP) ratios (100:0, 50:50, and 0:100 WF/ONP) on the mechanical strength and water resistance of dry-process hardboards made from these fibers. Untreated and acetylated hardboards were made with 3 or 7 percent resin and 0.5 percent wax. Boards were tested for static bending and tensile strength properties and water resistance. As expected, increasing the resin level from 3 to 7 percent generally improved all measured properties. Acetylation substantially improved the water resistance of all boards; increasing the amount of ONP caused a corresponding deterioration in both mechanical properties and water resistance.

scholarly journals PEMANFAATAN LIMBAH DAUN NANAS (Ananas comosus) SEBAGAI BAHAN BAKU PEMBUATAN PLASTIK BIODEGRADABLE

2019 ◽  
Vol 15 (3) ◽  
pp. 357
Author(s):  
Maria Natalia ◽  
Wirananditami Hazrifawati ◽  
Doni Rahmat Wicakso
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Water Resistance ◽  
Biodegradable Plastic ◽  
Raw Material ◽  
Ananas Comosus ◽  
Glycerol Concentration ◽  
Cellulose Solution ◽  
Plastic Degradation ◽  
Pineapple Leaves

Biodegradable plastic (bioplastics) is a polymer that can be degraded and made from renewable sources, including cellulose obtained from pineapple leaves. The purpose of this study is to determine the mechanical properties of bioplastics from cellulose, determine the optimum conditions based on the concentration of chitosan variations on cellulose solution and the addition of glycerol plasticizers to the mechanical properties of biodegradable plastic produced. This study begins with the manufacture of cellulose from pineapple leaves through a process of delignification and bleaching and then making biodegradable plastic 1% cellulose raw material with a variation of chitosan with a variation of 1%; 2%; 3% and the addition of plasticizer glycerol 1%, 2% and 3% (v/v). The results obtained will be observed by tensile tests, SEM tests, swelling tests, and biodegradation. The results obtained in the morphological test with the SEM test showed that cellulose was not evenly distributed. The tensile strength test for the addition of chitosan showed that the concentration of 3% had the highest tensile strength value of 11.8 MPa while the tensile strength of the addition of glycerol showed that the concentration of 3% had the highest tensile strength value of 3.6 MPa. The swelling test shows that glycerol concentration influences biodegradable plastic water resistance and glycerol 3% has the highest percentage of water resistance, 16.6%. In the biodegradable plastic degradation test with 3% glycerol experiencing the fastest degradation, this shows that glycerol has an effect on biodegradable plastic degradation

scholarly journals Pengaruh Konsentrasi Alginat Dengan Gliserol Sebagai Plasticizer Terhadap Sifat Fisik Dan Mekanik Bioplastik

2019 ◽  
Vol 8 (3) ◽  
pp. 314-321
Author(s):  
Novita Thea Puspita Langit ◽  
Ali Ridlo ◽  
Subagiyo Subagiyo
Keyword(s):  
Mechanical Properties ◽  
Weight Loss ◽  
Tensile Strength ◽  
Physical Properties ◽  
Water Resistance ◽  
Physical And Mechanical Properties ◽  
Packaging Materials ◽  
Biodegradable Packaging ◽  
Japanese Industrial Standard ◽  
Alginate Concentration

Munculnya permasalahan lingkungan akibat plastik sintetik mendorong perlunya penelitian bahan kemasan mudah terurai (bioplastik). Salah satu bahan yang tersedia di alam dan berpotensi sebagai pembentuk bioplastik adalah alginat karena mampu membentuk gel. Bioplastik dari alginat memiliki sifat yang tidak fleksibel sehingga perlu ditambah gliserol sebagai plasticizer. Penelitian ini bertujuan untuk mengetahui pengaruh konsentrasi alginat dari Sargassum sp. terhadap sifat fisik dan mekanik bioplastik dengan penambahan gliserol dan CaCl2. Materi penelitian ini adalah alginat hasil ekstraksi Sargassum sp. yang diambil dari Perairan Pantai Sundak, Gunung Kidul. Penelitian ini menggunakan metode eksperimental laboratoris yang terdiri dari empat perlakuan konsentrasi alginat (0,5%, 1%, 3% dan 5%)  dengan tiga pengulangan.  Sifat bioplastik yang diuji meliputi sifat fisik (ketebalan, ketahanan air, kehilangan berat) dan sifat mekanik (kuat tarik dan elongasi). Data yang diperoleh dianalisis menggunakan analisis sidik ragam (ANOVA). Hasil penelitian menunjukkan semakin tinggi konsentrasi alginat akan meningkatkan  ketebalan, ketahanan air dan kuat tarik bioplastik namun menurunkan elongasi dan kehilangan berat bioplastik. Konsentrasi alginat berpengaruh terhadap sifat fisik (ketebalan, ketahanan air, kehilangan berat) dan sifat mekanik (kuat tarik  kecuali elongasi), konsentrasi alginat terbaik yang memenuhi Japanese Industrial Standard dan standar SNI 7188.7:2016 adalah 0,5% The emergence of environmental problems due to synthetic plastics has led to the need to research biodegradable packaging materials (bioplastics). One of the ingredients available in nature and has the potential to form bioplastics is alginate because it is capable of forming gel. Bioplastic from alginate has inflexible properties so it needs to be added by glycerol as a plasticizer. This research aims to determine the effect of alginate concentration from Sargassum sp. on the physical and mechanical properties of bioplastics with the addition of glycerol and CaCl2. The method of this research is alginate from Sargassum sp. taken from Sundak Beach Waters, Gunung Kidul. This research used a laboratory experimental method consisting of four treatments of alginate concentration (0.5%, 1%, 3% and 5%) with three repetitions. The properties of the bioplastics tested included physical properties (thickness, water resistance, weight loss) and mechanical properties (tensile strength and elongation). Data obtained were analyzed using variance analysis (ANOVA). The results showed that the higher the concentration of alginate would increased thickness, water resistance and tensile strength of bioplastics but decreased the elongation and weight loss of bioplastics. The alginate concentration affects the physical properties (thickness, water resistance, weight loss) and mechanical properties (tensile strength and except elongation), the best alginate concentrations that meet the Japanese Industrial Standard and SNI 7188.7: 2016 are 0.5%

Extraction and characterization of crystalline cellulose from jute fiber and application as reinforcement in biocomposite: Effect of gamma radiation

2016 ◽  
Vol 51 (1) ◽  
pp. 31-38 ◽  
Author(s):  
Jahid MM Islam ◽  
Md Altaf Hossan ◽  
FR Alom ◽  
M Iqbal H Khan ◽  
Mubarak A Khan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Gamma Radiation ◽  
Water Resistance ◽  
Gelatin Film ◽  
Jute Fiber ◽  
Crystalline Cellulose ◽  
Gelatin Matrix ◽  
Water Sensitivity ◽  
Biocomposite Film

In this study, crystalline cellulose was prepared through hydrolysis of jute fiber and was used as reinforcement of gelatin-based biocomposite film. The effects of crystalline celluloses loading on the morphology, mechanical properties and water sensitivity of the biocomposite were investigated by means of Scanning electron microscopy, tensile strength testing and water absorption testing. The developed biocomposite film showed homogeneous dispersion of crystalline celluloses within the gelatin matrix and strong interfacial adherence between matrix and reinforcement. A significant increase in tensile strength and E Modulus was also found (tensile strength was 25.4 MPa for pure gelatin and 48.2 MPa for 2% crystalline celluloses/gelatin film at 45% relative humidity), which was further induced by gamma radiation. The resulting biocomposite film also showed a higher water resistance and excellent biocompatibility. Therefore, crystalline celluloses played an important role in improving the mechanical properties as well as water resistance of the biocomposite film.

Synthesis and Characterization of Polyorganosiloxane Modified Waterborne Polyurethane

2009 ◽  
Vol 79-82 ◽  
pp. 1055-1058
Author(s):  
Sui Lian Luo ◽  
Chao Dong Liu ◽  
Guo Fei Gong ◽  
Hei Ping Lai ◽  
Wen Zhong Kong
Keyword(s):  
Particle Size ◽  
Tensile Strength ◽  
Water Resistance ◽  
Soft Segment ◽  
Waterborne Polyurethane ◽  
Synthesis And Characterization ◽  
Wood Coatings ◽  
Weather Resistance ◽  
Improve Water Resistance

In this work, PDMS modified PU was synthesized using two-stage method to improve water resistance and weather resistance in the waterborne polyurethane was investigated. It was found that the absorbed water content decreased with increasing PDMS content in polyurethane. It was also found that PDMS modified polyurethane had better solvent resistance than unmodified polyurethane. The structure incorporated the PDMS into the soft segment of polyurethane chains was confirmed by FTIR. The phase separation increased by increasing PDMS content and was confirmed by DSC. The particle size of the dispersions increased and tensile strength and hardness decreased with the increase of PDMS content. Furthermore, with the improved water resistance and elongation, it was hoped that the modified polyurethane could be used as wood coatings superior to the solvent-borne systems.

Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

1974 ◽  
Vol 32 ◽  
pp. 514-515
Author(s):  
S. Fujishiro
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Mechanical Processing ◽  
Ray Method ◽  
X Ray ◽  
Transmission Electron ◽  
Water Quench ◽  
Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

Effect of silver nitrate on some mechanical properties of heat polymerizing acrylic resins

2019 ◽  
Vol 14 (1) ◽  
pp. 110
Author(s):  
Assiss. Prof. Dr. Sabiha Mahdi Mahdi ◽  
Dr. Firas Abd K. Abd K.
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Silver Nitrate ◽  
Surface Hardness ◽  
Mechanical Tests ◽  
Hardness Tester ◽  
Acrylic Resins ◽  
The Difference

Aim: The aimed study was to evaluate the influence of silver nitrate on surfacehardness and tensile strength of acrylic resins.Materials and methods: A total of 60 specimens were made from heat polymerizingresins. Two mechanical tests were utilized (surface hardness and tensile strength)and 4 experimental groups according to the concentration of silver nitrate used.The specimens without the use of silver nitrate were considered as control. Fortensile strength, all specimens were subjected to force till fracture. For surfacehardness, the specimens were tested via a durometer hardness tester. Allspecimens data were analyzed via ANOVA and Tukey tests.Results: The addition of silver nitrate to acrylic resins reduced significantly thetensile strength. Statistically, highly significant differences were found among allgroups (P≤0.001). Also, the difference between control and experimental groupswas highly significant (P≤0.001). For surface hardness, the silver nitrate improvedthe surface hardness of acrylics. Highly significant differences were statisticallyobserved between control and 900 ppm group (P≤0.001); and among all groups(P≤0.001)with exception that no significant differences between control and150ppm; and between 150ppm and 900ppm groups(P>0.05).Conclusion: The addition of silver nitrate to acrylics reduced significantly the tensilestrength and improved slightly the surface hardness.

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