scholarly journals Pengaruh Kitosan Terhadap Karakterisasi Hidrogel Film PVA Untuk Aplikasi Pembalut Luka

2021 ◽  
Vol 22 (2) ◽  
pp. 123
Author(s):  
Haryanto Haryanto
Keyword(s):  
Tensile Strength ◽  
Gamma Ray ◽  
Infra Red

Pegembangan hidrogel sebagai bahan pembalut luka telah banyak mendapat perhatian dari para peneliti. Salah satu jenis hidrogel film yang telah banyak dikembangkan adalah Polyvinyl Alkohol (PVA) hidrogel film. Tingkat penyerapan air dari hidrogel ini masih rendah. Untuk meningkatkan kualitas hidrogel perlu ditambahkan zat lain. Penelitian ini dilakukan untuk mengetahui pengaruh kitosan terhadap karakterisasi Polyvinyl Alkohol (PVA) hidrogel film. Formulasi konsentrasi kitosan 0% sampai 15% dan diradiasi untuk mendapatkan hidrogel ikat silang dengan menggunakan radiasi gamma ray dengan dosis 40 KGy. Karakteristik yang diukur meliputi fraksi gel, rasio swelling, sifat mekanik ( tensile strength dan elongation ). Struktur kimia diukur dengan menggunakan Frourier Transform Infra Red (FTIR). Dan bentuk morfologi hidrogel dianalisis menggunakan Scanning Electrone Microscope (SEM). Hasil penelitian menunjukkan bahwa nilai fraksi gel menurun dengan bertambahnya kandungan kitosan sedangkan rasio swelling sebaliknya semakin meingkat. Kekuatan hidrogel cenderung menurun dilihat pada kuat tarik dari 30 N/mm2 menjadi 7,2 N/mm2 dan persen elongasi dari 480,57% sampai 224,79%.  Hasil penelitian menunjukkan bahwa penambahan kitosan dapat meningkatkan rasio swelling hidrogel. Walaupun hanya rasio swelling yang meningkat tetapi dilihat dari fraski gel dan kuat mekanik ( tensile strength dan elongation) masih memenuhi persyaratan untuk pembalut luka sehingga hidrogel PVA/kitosan dapat digunakan untuk aplikasi pembalut luka.

Effect of Gamma Radiation on Properties of Cellulose Nanocrystal/Natural Rubber Nanocomposites

2018 ◽  
Vol 772 ◽  
pp. 13-17 ◽  
Author(s):  
Wapoon Tappanawatch ◽  
Paweena Prapainainar ◽  
Pongdhorn Sae-Oui ◽  
Surapich Loykulnant ◽  
Peerapan Dittanet
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Gamma Ray ◽  
Mechanical Performance ◽  
Reaction Times ◽  
Tensile Modulus ◽  
Alkaline Treatment ◽  
Corn Cob ◽  
Elongation At Break ◽  
Reinforcing Agent

Cellulose nanocrystals (CNC) were extracted from corn cob and synthesized by alkaline treatment using 3 wt% sodium hydroxide (NaOH). Acid hydrolysis with 64 wt% sulfuric acid (H2SO4) at different reaction times (30, 45, 60 min) was performed to obtain CNC solutions. CNC was evaluated as a reinforcing agent in natural rubber (NR) at CNC loadings from 1-5 wt%. Gamma-ray radiation was used as vulcanization method and varied at 10 and 20 kGy. The tensile modulus and tensile strength of NR vulcanizates increased with addition of CNC and contents. In addition, radiation by gamma ray impacts the mechanical performance, where CNC/NR composites vulcanized with higher dose of radiation of 20 KGy were found to have the higher values in tensile strength, elongation at break, and modulus than with 10 KGy. Moreover, the tensile strength and elongation at break of the composites after aging were found to slightly increase due to post-curing during the aging process.

scholarly journals Effect of Addition of Soybean Oil and Gamma-Ray Cross-linking on the Nanoporous HDPE Membrane

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Jong-Seok Park ◽  
Jong-Bae Choi ◽  
Hui-Jeong Gwon ◽  
Youn-Mook Lim ◽  
Myung Seob Khil ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Soybean Oil ◽  
Gamma Rays ◽  
High Density Polyethylene ◽  
Dibutyl Phthalate ◽  
Gamma Ray ◽  
Absorbed Dose ◽  
Electrochemical Stability ◽  
Cross Linking ◽  
Wet Process

A nanoporous high-density polyethylene (HDPE) membrane was prepared by a wet process. Soybean oil and dibutyl phthalate (DBP) were premixed as codiluents, and gamma-rays were used for the cross-linking of HDPE. The pore volume of the nanoporous HDPE membranes with soybean oil was affected by the extracted amount of oil. The tensile strength of the membrane improved with an increasing absorbed dose up to 60 kGy, but decreased at 80 kGy due to severe degradation. The ionic conductivity of the nanoporous HDPE membrane did not really change with an increasing absorbed dose because the pores had already been formed before the gamma-ray radiation. Finally, the electrochemical stability of the HDPE membrane increased when the absorbed dose increased up to 60 kGy.

scholarly journals A study of dental soldering. (Part IX). Tensile strength of nickel-chromium base metal presoldered joints, soldered by focused energy of infra-red.

1988 ◽  
Vol 32 (4) ◽  
pp. 814-820 ◽  
Author(s):  
Yoshiyuki Hagiwara ◽  
Hiromi Osawa ◽  
Masataka Shibuya ◽  
Masayuki Tomomatsu ◽  
Shinya Hanamura ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Base Metal ◽  
Nickel Chromium ◽  
Infra Red

scholarly journals Mechanical and Shielding Properties of Concrete Subject to Gamma-ray

2020 ◽  
Vol 9 (1) ◽  
pp. 42-49 ◽  
Author(s):  
S. Hosein Ghasemzadeh Mosavinejad ◽  
Samira Kazemi Rad
Keyword(s):  
Tensile Strength ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Pulse Wave ◽  
Graphite Powder ◽  
Ultrasonic Pulse ◽  
Protective Material ◽  
Attenuation Coefficients ◽  
Protective Properties ◽  
Shielding Properties

 In this research, concrete with different percentages of 0, 10, 25, 50, 75 and 100 of barite powder and 10% of graphite powder were investigated for the study of gamma protective properties. The transmitted fluxes of gamma-rays that were emitted from Cs-137 source were detected by a NaI(Tl) detector and analyzed by an MCA analyzer. Then, the samples were tested for compressive strength, tensile strength, ultrasonic pulse wave velocity and the linear attenuation coefficients. By comparing the obtained samples, it was observed that a sample containing 10% barite powder plus 10% graphite powder could be used as a protective material against gamma rays.

scholarly journals SYNTHESIS AND CHARACTERIZATION OF HDPE PLASTIC FILM FOR HERBICIDE CONTAINER USING FLY ASH CLASS F AS FILLER

2010 ◽  
Vol 9 (3) ◽  
pp. 348-354
Author(s):  
Yatim Lailun Ni’mah ◽  
Lukman Atmaja ◽  
Hendro Juwono
Keyword(s):  
Tensile Strength ◽  
Fly Ash ◽  
Chemical Resistance ◽  
Active Material ◽  
Filler Concentration ◽  
Plastic Film ◽  
Infra Red ◽  
Class F Fly Ash ◽  
Class F

High Density Polyethylene (HDPE) plastic plays an important role in various applications, for example, it can be used as a container (bottle). Petrokimia Kayaku Company, a branch of Petrokimia Company of Gresik, produces herbicides using HDPE plastic bottles as their container. Those plastic bottles undergo degradation (kempot) for certain period of time. The aim of this research is to characterize and to synthesize the HDPE plastic film with class F fly ash as filler. The results expected from this research are producing the plastic with a better properties and durability. This research was initiated by taking the sample of HDPE plastic bottle and herbicides (containing Gramakuat, on active material parakuat dichloride) at Petrokimia Kayaku Company. Both the initial HDPE and the degraded bottles was analyzed their tensile strength and Fourier Transform-Infra Red (FTIR) spectral. The next step was to synthesize the HDPE plastic film using class F fly ash as filler and a coupling agent. The filler concentrations were 0%, 5%, 10%, 15%, and 20wt %. The best result was 5% filler concentration with tensile strength of 27.7 lbs. This HDPE film was then subjected to degradation test using pyridine solution with various concentrations (1%, 3% and 5%) for two weeks, thermal degradation at 100 °C for two weeks and chemical resistance by xylene with soak time variation of 24 h, 98 h and 168 h. The result of degradations test show that the value of tensile strength was decreased with the increase of filler consentration. The chemical resistance, however, was increased.   Keywords: degradation, filler, fly ash, HDPE, Herbicide

scholarly journals Effect Carrageenan to Biodegradable Plastic From Tubers

2020 ◽  
Vol 8 (2) ◽  
pp. 148-155
Author(s):  
Toto Rusianto ◽  
Murni Yuniwati ◽  
Hary Wibowo
Keyword(s):  
Tensile Strength ◽  
Protein Quality ◽  
Biodegradable Plastic ◽  
Test Results ◽  
Chemical Structures ◽  
Infra Red ◽  
Degradation Testing ◽  
Tuber Species ◽  
Effective Microorganism ◽  
Phenolic Alcohols

Plastic waste can cause serious environmental problems. This can be overcome by various efforts; one of them is by replacing the use of conventional plastic with biodegradable plastic. Biodegradable plastic can be produced from tubers containing starch. The purpose of this study was to explain the suitability of two tuber species with typical protein quality and different starch structures. Starch was obtained from suweg tuber (Amorphophallus campanulatus) and ganyong (Canna edulis Ker). The material invested was obtained by dissolving 4 grams of each starch, each of which was dissolved with distilled water then added with various weight carrageenan. The tensile strength of biodegradable plastic was tested using tensile testing machines, biodegradation of soaked plastics using EM4 (Effective Microorganism) with reduced weight measurements, and Fourier Transform Infra-Red (FTIR) was used to identify the structure of compounds contained in biodegradable plastics. The tensile strength test results of biodegradable plastic from ganyong/canna tubers were 3.35 MPa with elongation of 13.51%, while the plastic from suweg tubers of 2.45 MPa with elongation was 13.68% on the addition of 5% carrageenan, respectively. Plastic degradation testing obtained plastic decomposition up to 100% in 37 days for ganyong and 34 days for suweg, respectively. It showed that the plastics was easily degraded. Identified by FTIR showed chemical structures of OH phenolic alcohols, C = O carbonyls, CO esters, NH amides and amines, and C≡C alkyne.

Effect of CTBN on Properties of Oxide Graphene/Epoxy Resin Composites

2011 ◽  
Vol 412 ◽  
pp. 393-396
Author(s):  
Chun Fa Ouyang ◽  
Qun Gao ◽  
Yu Tao Shi ◽  
Wen Tao Li
Keyword(s):  
Tensile Strength ◽  
Shear Strength ◽  
Epoxy Resin ◽  
Ester Group ◽  
Resin Composites ◽  
Elongation At Break ◽  
Acrylonitrile Copolymer ◽  
Infra Red ◽  
Epoxy Resin Composites

The effect of liquid carboxyl terminated butadiene acrylonitrile copolymer (CTBN) on the properties of oxide graphene (OG) /epoxy resin (EP) composite has been studied. The results show that oscillations process can greatly increase the tensile strength, shear strength and hardness of the composites, for the compatibility between the EP and the OG can be greatly improved after oscillations. Infra-red analysis shows that CTBN reacts with EP to form ester group. The tensile strength of the EP decrease, and the elongation at break increase, as more and more CTBN added. The tensile strength of the OG/EP composite is 14.37 MPa, while that of CTBN/OG/EP (15/0.001/100) composite is 4.84 MPa.

Fluoride glass etching method for preparation of infra-red fibres with improved tensile strength

1986 ◽  
Vol 22 (18) ◽  
pp. 949 ◽  
Author(s):  
H.W. Schneider ◽  
A. Schoberth ◽  
A. Staudt ◽  
C. Gerndt
Keyword(s):  
Tensile Strength ◽  
Fluoride Glass ◽  
Etching Method ◽  
Infra Red ◽  
Glass Etching

Geophysics in the engineering earth sciences

1971 ◽  
Vol 2 (2) ◽  
pp. 50 ◽  
Author(s):  
C.C. Wood
Keyword(s):  
Earth Sciences ◽  
Remote Sensing ◽  
Construction Industry ◽  
Gamma Ray ◽  
Civil Engineering ◽  
Engineering Construction ◽  
Borehole Logging ◽  
Engineering Seismology ◽  
Infra Red ◽  
Radar Imagery

Geophysics has an important role in investigations relating to the civil engineering construction industry. Its principal contributions relate to the following topics: Seismic methods using refraction and reflection; Resistivity studies of surface traverses for profiling and sounding and borehole logging; Gamma ray logging in bore holes; Analysis of vibrations in engineering seismology in industrially produced vibrations; Remote sensing, using infra-red, thermal and radar imagery.

Sign in / Sign up

Export Citation Format

Share Document