scholarly journals The properties of hydrogel membranes obtained by modification in the volyme

2021 ◽  
Vol 4 (1) ◽  
pp. 158-165
Author(s):  
N. M. Baran ◽  
◽  
O. V. Suberlyak ◽  
O. M. Grytsenko ◽  
V. S. Moravskyi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Water Content ◽  
Polyamide 6 ◽  
Composite Hydrogel ◽  
Hydroxyethyl Methacrylate ◽  
Hydrogel Membranes

The method of the composite hydrogel membranes synthesis based on the 2-hydroxyethyl methacrylate (HEMA) and polyvinylpyrrolidone (PVP) with simultaneous modification in the volume by the mixture of polyamide-6 (PA-6) and PVP solution with varying the concentration of the reaction mixture in the water has been described in this study. The influence of the water content in the reaction composition on the physical mechanical properties and water absorption of the obtained membranes has been investigated.

Preparation and swelling properties of poly(acrylic acid-co-acrylamide) composite hydrogels

e-Polymers ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 95-106 ◽  
Author(s):  
Wei-Min Cheng ◽  
Xiang-Ming Hu ◽  
Yan-Yun Zhao ◽  
Ming-Yue Wu ◽  
Zun-Xiang Hu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Salt Tolerance ◽  
Acrylic Acid ◽  
Water Absorption ◽  
Crosslinking Agent ◽  
Salt Resistance ◽  
Composite Hydrogel ◽  
Swelling Properties ◽  
Unfavorable Effect ◽  
Poly Acrylic Acid

AbstractIn order to study the effect of composite clays on the mechanical properties, water absorption and salt tolerance of a hydrogel, a poly(acrylic acid-co-acrylamide)/bentonite/kaolin composite hydrogel was prepared. Acrylic acid and acrylamide have been used as water absorbent monomers. N,N′-methylene bisacrylamide was used as a crosslinking agent while potassium persulfate was used as an initiator. The water preserving capability, repeated water absorption, salt resistance and the mechanical properties of the composite hydrogel are analyzed and discussed. The results show that a small quantity of bentonite can increase the storage modulus of the composite hydrogel, whereas the excess clay had an unfavorable effect on the mechanical strength of the composite hydrogel. Both bentonite and kaolin significantly improved the water preserving capability, repeated water absorption and salt resistance of the composite hydrogel. Optimum values for the amounts of bentonite and kaolin were found to be 10% and 5%, respectively.

scholarly journals Low Water Absorption, High-Strength Polyamide 6 Composites Blended with Sustainable Bamboo-Based Biochar

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1367
Author(s):  
Shiliu Zhu ◽  
Yong Guo ◽  
Yuxia Chen ◽  
Shengquan Liu
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Water Absorption ◽  
High Strength ◽  
Polyamide 6 ◽  
Negative Effects ◽  
Plant Fibers ◽  
Maximum Decrease ◽  
Bamboo Fibers ◽  
The Impact

To promote the application of polyamide 6 (PA6) in wood–plastic composites, the negative effects associated with the thermal degradation of plant fibers must be overcome. In this study, waste bamboo fibers were subjected to pyrolysis and ball milling to afford nano bamboo-based biochar (BC), which was subsequently used as reinforcement to prepare PA6/BC nano composites by injection molding. In addition, the processing fluidity, water absorption, mechanical properties, and interface compatibility of PA6/BC composites were discussed. Results revealed that a BC content of less than 30 wt% is beneficial to improve the processing fluidity of the composites. With the increase in the BC content, the density of the PA6/BC composites gradually increased, while the water absorption of the PA6/BC composites gradually decreased, and the maximum decrease was 46%. Compared to that of pure PA6, the mechanical strength of PA6/BC composites was improved by the addition of BC, and the maximum tensile/flexural strength and modulus of PA6/BC composites increased by 41%/72% and 195%/244%, respectively. However, the impact strength decreased by 27%. After immersion treatment, the dimensional stability and mechanical strength of the composites decreased, while toughness improved. At a BC content of less than 40 wt%, BC particles exhibited good dispersibility and wettability in the PA6 matrix, and the rough surface and rich pore structure of BC rendered strong mechanical interlocking effects and good interface compatibility, thereby enhancing the mechanical properties of the composites.

scholarly journals Hybrid Cellulose-Glass Fiber Composites for Automotive Applications

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3189 ◽  
Author(s):  
Annandarajah ◽  
Langhorst ◽  
Kiziltas ◽  
Grewell ◽  
Mielewski ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Fiber Composite ◽  
Glass Fibers ◽  
Flexural Modulus ◽  
Natural Fibers ◽  
Polyamide 6 ◽  
Morphological Properties ◽  
Hybrid Fibers ◽  
Glass Fiber Composites

: In the recent years, automakers have been striving to improve the carbon footprint of their vehicles. Sustainable composites, consisting of natural fibers, and/or recycled polymers have been developed as a way to increase the “green content” and reduce the weight of a vehicle. In addition, recent studies have found that the introduction of synthetic fibers to a traditional fiber composite such as glass filled plastics, producing a composite with multiple fillers (hybrid fibers), can result in superior mechanical properties. The objective of this work was to investigate the effect of hybrid fibers on characterization and material properties of polyamide-6 (PA6)/polypropylene (PP) blends. Cellulose and glass fibers were used as fillers and the mechanical, water absorption, and morphological properties of composites were evaluated. The addition of hybrid fibers increased the stiffness (tensile and flexural modulus) of the composites. Glass fibers reduced composite water absorption while the addition of cellulose fibers resulted in higher composite stiffness. The mechanical properties of glass and cellulose filled PA6/PP composites were optimized at loading levels of 15 wt% glass and 10 wt% cellulose, respectively.

scholarly journals SIFAT FISIK DAN MEKANIK KOMPOSIT KAYU SEMEN-SERBUK GERGAJI

PERENNIAL ◽  
2006 ◽  
Vol 2 (1) ◽  
pp. 38 ◽  
Author(s):  
. Bakri ◽  
Endra Gunawan ◽  
Djamal Sanusi
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Water Absorption ◽  
Key Words ◽  
Water Content ◽  
Physical And Mechanical Properties ◽  
Wood Composite ◽  
Thickness Swelling ◽  
Iso Standards ◽  
Saw Dust

This research aims to find out the effect of cement-saw dust ratio levels on the physical and mechanical properties of produced composites. The physical properties (density, water content, water absorption after the immersion of one hour and 24 hours, and thickness swelling after the immersion of one hour and 24 hours) and mechanical properties (MOE and MOR) were observed according to ISO standards. The results showed that the use of the cement to sawdust ratio of 3 : 1 in producing wood composite with the target density of 1200 kg/m3 resulted in the lowest water absorption and the highest MOE and MOR. The swelling value and MOR of the produced boards were not acceptable, but their water content, water absorption, and MOE parameters were acceptable according to ISO 8335 1997. Key Words : Physical and mechanical properties, cement wood composite, sawdust

scholarly journals Cangkang Buah Karet Dengan Perekat Limbah Plastik Polipropilena Sebagai Alternatif Papan Partikel

2016 ◽  
Vol 1 (2) ◽  
pp. 86
Author(s):  
Charles Banon ◽  
Teja Dwi Sutanto ◽  
Irfan Gustian ◽  
Ilman Koharudin ◽  
Widia Rahmi
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Water Content ◽  
Room Temperature ◽  
Particle Board ◽  
Hot Press ◽  
Shell Powder

AbstrakTelah dilakukan pembuatan dan karakterisasi mekanik papan partikel berbasis cangkang buah karet dengan perekat limbah plastik polipropilen.  Papan partikel dibuat dengan variasi berat serbuk cangkang buah karet masing-masing 50 gram, 100 gram dan 150 gram, dicetak dengan ukuran 28 cm ´ 12 cm ´ 4 cm. Campuran serbuk cangkang dan perekat selanjutnya dikempa menggunakan alat press sederhana selama 1 jam dalam keadaan panas, kemudian didiamkan selama 7 hari pada suhu kamar. Karakterisasi papan partikel meliputi pengujian sifat fisika dan sifat mekanik. Papan partikel yang terbuat dari limbah plastik polipropilena dan cangkang buah karet memiliki kerapatan 0,81 – 0,88 g/cm3, kadar air 0,34 – 0,93%, daya serap air 5,67 – 10,69% dan tebal pengembangan 0,26 – 1,62%. Hasil uji sifat mekanik papan partikel dari serbuk cangkang buah karet dan plastik polipropilena menunjukkan nilai keteguhan patah 53 – 56,54 kgf/cm2, nilai keteguhan elastis 253,85 – 400,87 kgf/cm2 dan kuat cabut sekrup sebesar 1,96 kgf/cm2. Kata kunci: Cangkang buah karet, polipropilena, papan partikel, sifat fisika dan mekanik  AbstractPreparation and characterization mechanical properties of particles board based shells fruit rubber use plastic of polypropylene waste as adhesive has been done. Preparation of the Particle board based shells fruit rubber and plastic of polypropylene addition with variation of 50, 100 and 150 grams. The Particle board was printed on the same size 28 cm ´ 12 cm ´ 4 cm. Blending of the internal shell powder and adhesive of polypropylene used a hot press for 1 hour, then settled for 7 days at room temperature. Characterization the particles board includes of the physics and mechanical properties. It is the density 0.81 – 0.88 g/cm3, of the water content 0.34 – 0.93%, water absorption 5.67 – 10.69% and the thickness board expansion 0.26 – 1.62%. The values of MOR and MOE of particle board was 53.00 – 56.54 kgf/cm2, and 253.85 – 400.87 kgf/cm2. The values of strong pull secrew was 1.96 kgf/cm2. Keywords: Shells fruit rubber, polypropylene, particle board, physic and mechanical properties

Incorporation of Iraqi Rocks in the Production of Eco-Friendly Cement Mortar

2020 ◽  
Vol 38 (10A) ◽  
pp. 1522-1530
Author(s):  
Rawnaq S. Mahdi ◽  
Aseel B. AL-Zubidi ◽  
Hassan N. Hashim
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Water Absorption ◽  
Structural Properties ◽  
Mechanical Milling ◽  
Cement Mortar ◽  
Cement Mortars

This work reports on the incorporation of Flint and Kaolin rocks powders in the cement mortar in an attempt to improve its mechanical properties and produce an eco-friendly mortar. Flint and Kaolin powders are prepared by dry mechanical milling. The two powders are added separately to the mortars substituting cement partially. The two powders are found to improve the mechanical properties of the mortars. Hardness and compressive strength are found to increase with the increase of powders constituents in the cement mortars. In addition, the two powders affect water absorption and thermal conductivity of the mortar specimens which are desirable for construction applications. Kaolin is found to have a greater effect on the mechanical properties, water absorption, and thermal conductivity of the mortars than Flint. This behavior is discussed and analyzed based on the compositional and structural properties of the rocks powders.

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