scholarly journals PENGARUH AGING PADA KEKUATAN TARIK (TENSILE STRENGTH) FILM LATEKS KARET ALAM BERPENGISI NANOKRISTALIN SELULOSA DAN PENYERASI ALKANOLAMIDA

2016 ◽  
Vol 5 (2) ◽  
pp. 27-31
Author(s):  
Marfuah Lubis ◽  
Nuim Hayat ◽  
Hamidah Harahap
Keyword(s):  
Tensile Strength ◽  
Tensile Test ◽  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Aging Treatment ◽  
Nanocrystalline Cellulose ◽  
Latex Film ◽  
Latex Films ◽  
Rubber Latex ◽  
Tensile Test Result

Nanocrystalline cellulose is nano sized filler with high crystallinity and obtanained by hydrolysis of alpha cellulose from sugarcane bagasse. Tensile test of natural rubber latex film filled nanocrystalline cellulose and alkanolamide as compatibilizer after aging treatment have been done. Natural rubber latex films were prepared by coagulant dipping method and followed by vulcanization process at temperature 100 oC and 20 minutes. Aging treatment of natural rubber latex films have done at temperature 70 oC for 24 hours. Tensile test result of natural rubber latex filled nanocrystalline cellulose showed the tensile strength value of aged natural rubber latex film were lower than unaged one. However, tensile strength value of aged natural rubber latex film filled nanocrystalline cellulose modified alkanolamide were higher than unaged film.

Anti-Microbial and Self-Cleaning of Natural Rubber Latex Gloves by Adding Mangosteen Peel Powder

2018 ◽  
Vol 777 ◽  
pp. 3-7 ◽  
Author(s):  
Wasan Moopayuk ◽  
Nuchnapa Tangboriboon
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Film Surface ◽  
Latex Film ◽  
Rubber Latex ◽  
Elongation At Break ◽  
Latex Glove ◽  
Latex Gloves ◽  
Mangosteen Peel

Mangosteen peel powder is one of the most important bio-antioxidants. Adding mangosteen peel powder as filler into natural rubber latex compound for latex glove film formation via dipping process can help the green anti-microbial properties. The physical (smoothness and thickness of film) and mechanical properties (tensile strength and elongation at break) of latex film are still good. Therefore, adding mangosteen peel powder into natural rubber latex gloves can reduce the anti-allergic and antimicrobial on the film surface. Mangosteen peel powder ground by rapid mill is fine particle and high surface area 2.4216 m2/g suitable for homogeneous and compatible for adding into natural rubber latex compound. Ceramic hand mold was dipped into the Ca (NO3)2 coagulant only 3 seconds, then dipped into the natural rubber latex compounds added mangosteen peel powder for 15 seconds, withdrawn hand mold slowly, cured in the oven at 120°C for 30 min, then dried at room temperature, and casted it off the hand mold. The obtained natural latex glove films added mangosteen peel powder are smooth, clear, and thin film surface, the highest elongation at break 803.2711 ± 31.6477%, good tensile strength 30.2933 ± 6.0218 MPa, dense film without water leakage, and good contact angle.

Effect of Leaching and Humidity on Prevulcanized NR Latex Films

1997 ◽  
Vol 70 (4) ◽  
pp. 560-571 ◽  
Author(s):  
M. Y. Amir-Hashim ◽  
M. D. Morris ◽  
M. G. O'Brien ◽  
A. S. Farid
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Natural Rubber Latex ◽  
High Humidity ◽  
Latex Films ◽  
Rubber Latex ◽  
Softening Effect ◽  
Dry Conditions ◽  
Volume Swelling ◽  
Stiffening Effect

Abstract In an attempt to improve the understanding of the mechanism by which aqueous leaching of prevulcanized natural rubber latex films improves their physical properties, experiments have been carried out on such films after storage under controlled humidity conditions. Under conditions of ambient and high humidity, unleached films were found to absorb much more moisture than their leached counterparts. Results obtained from the equilibrium volume swelling measurements and from the C1 constant of the Mooney-Rivlin plots indicated that crosslink density was not affected by leaching. The effect of leaching on the tensile strength and modulus however was generally significant. Under high humidity conditions an increase in modulus on leaching was observed. These results are explained in terms of the hydrophilic nonrubbers having a stiffening effect under dry conditions and a softening effect when wet. Conditioning humidity also had a direct effect on the tensile strength. As humidity increases, the peak in tensile strength against modulus shifts to lower strength and modulus values. Some of the findings were supported by data from experiments in which a hydrophilic nonrubber component, namely sucrose, was deliberately added to prevulcanized natural rubber latex.

Reinforcement of Natural Rubber Latex Film by Starch Nanocrystal

2014 ◽  
Vol 543-547 ◽  
pp. 3886-3891 ◽  
Author(s):  
Yang Jian Shu Gao ◽  
Sen Zhao ◽  
Shuang Quan Liao ◽  
Lin Fang ◽  
Zhi Fen Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Acid Hydrolysis ◽  
Mechanical Stability ◽  
Natural Rubber Latex ◽  
Crosslinking Density ◽  
Latex Film ◽  
Latex Films ◽  
Rubber Latex ◽  
Starch Nanocrystals

Starch nanocrystals obtained from acid hydrolysis, and the starch/natural rubber latex film was prepared by blending the starch nanocrystals with natural rubber latex. The latex properties such as viscosity and mechanical stability, water and toluene uptake, crosslinking density and mechanical properties of the latex films were investigated. The results showed that the mechanical stability of natural rubber latex reinforced by starch nanocrystals increased, but the change of viscosity was not obvious. By adding starch nanocrystals in natural rubber latex, the swelling by toluene decreases and the swelling by water increased. The mechanical properties and crosslinking density of films were enhanced with the increase of starch loading.

Surface Modification of Natural Rubber Latex Film Using Photocrosslinkable Chitosan

2012 ◽  
Vol 482-484 ◽  
pp. 824-829
Author(s):  
He Ping Yu ◽  
Zong Qiang Zeng ◽  
Hong Chao Liu ◽  
Yong Yue Luo
Keyword(s):  
Contact Angle ◽  
Natural Rubber ◽  
Water Contact Angle ◽  
Irradiation Time ◽  
Natural Rubber Latex ◽  
Water Soluble ◽  
Latex Film ◽  
Latex Films ◽  
Rubber Latex ◽  
Water Contact

Surface modifications of natural rubber latex films were carried out to improve the hydrophilicity by UV-induced immobilization of water-soluble butyryl derivative of chitosan using the photosensitive hetero-bifunctional crosslinking reagent, 4-azidobenzoic acid. The effects of the concentration of modified chitosan solution and UV irradiation time on the water contact angle values of natural rubber latex films were studied. ATR-FTIR analyses confirmed that the O-butylrylchitosan molecules were covalently bonded onto the surface of natural rubber latex film. The water contact angle value of natural rubber latex film which is about 95o reduces to 55o significantly with the introduction of O-butylrylchitosan. The results indicate that the hydrophilic behaviour of natural rubber latex film has been improved by immobilization of O-butylrylchitosan.

scholarly journals PENGARUH PERLAKUAN LEACHING TERHADAP SIFAT MEKANIK FILM LATEKS KARET ALAM BERPENGISI SELULOSA MIKROKRISTAL DARI AMPAS TEBU

2017 ◽  
Vol 5 (4) ◽  
pp. 46-52
Author(s):  
Rismadhani Elita ◽  
Rojiyatul Ikhwani Lubis ◽  
Hamidah Harahap
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Natural Rubber ◽  
Microcrystalline Cellulose ◽  
Natural Rubber Latex ◽  
Latex Film ◽  
Test Results ◽  
Rubber Latex ◽  
Different Temperatures ◽  
Vulcanization Process

Leaching process is one of many factors to raise up the mechanical properties of latex products. Studies on the effect of leaching on film natural rubber latex with the filler microcrystalline cellulose from bagasse with alkanolamide using different temperatures and times vulcanization has been done to produce the better mechanical properties such as strenght tensile and elongation at break. Filming of natural rubber latex is done by coagulants dyeing techniques. The study started with the process of pre-vulcanised natural rubber latex at 70 °C with a loading filler by 0 phr, 5 phr, 10 phr and 15 phr and followed by a vulcanization process at a temperature of 100 °C and 150 °C for 10 minutes and 20 minutes. The film result will be have leaching treatment using a solution of water and ammonia 1%. Test results of tensile strength of natural rubber latex film howed that the tensile strength of natural rubber latex film with microcrystalline cellulose as filler and alkanolamides after leaching less than the tensile strength of natural rubber lateks film before leaching

scholarly journals Physicochemical, Thermomechanical, and Swelling Properties of Radiation Vulcanised Natural Rubber Latex Film: Effect of Diospyros peregrina Fruit Extracts

2013 ◽  
Vol 2013 ◽  
pp. 1-8
Author(s):  
Kazi Md Zakir Hossain ◽  
Nashid Sharif ◽  
N. C. Dafader ◽  
M. E. Haque ◽  
A. M. Sarwaruddin Chowdhury
Keyword(s):  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Tensile Modulus ◽  
Decomposition Temperature ◽  
Latex Film ◽  
Cross Linking ◽  
Rubber Latex ◽  
Swelling Properties ◽  
Fruit Extracts ◽  
Control Film

A range of radiation vulcanised natural rubber latex (RVNRL) films were prepared using various concentrations of aqueous extracts of mature Diospyros peregrina fruit, which acted as a cross-linking agent. The surface of the RVNRL films exhibited an aggregated morphology of the rubber hydrocarbon with increasing roughness due to increasing fruit extract contents in the latex. An improvement in tensile strength, tensile modulus, and storage modulus of RVNRL films was observed with the addition of fruit extracts compared to the control film due to their cross-linking effect. The glass transition (Tg) temperature of all the RVNRL films was found to be at around −61.5°C. The films were also observed to be thermally stable up to 325°C, while the maximum decomposition temperature appeared at around 375°C. The incorporation of fruit extracts further revealed a significant influence on increasing the crystallinity, gel content, and physical cross-link density of the RVNRL films.

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