A model filler network in nanocomposites prepared by in situ silica filling and peroxide cross-linking in natural rubber latex

2015 ◽  
Vol 293 (7) ◽  
pp. 2083-2093 ◽  
Author(s):  
Atitaya Tohsan ◽  
Ryota Kishi ◽  
Yuko Ikeda
Keyword(s):  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Cross Linking ◽  
Rubber Latex ◽  
In Situ Silica ◽  
Filler Network

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.

scholarly journals Grafting of n-butyl acrylate with natural rubber latex film by gamma radiation: a reaction mechanism

1970 ◽  
Vol 5 (1) ◽  
pp. 81-88 ◽  
Author(s):  
KMZ Hossain ◽  
AM Sarwaruddin Chowdhury
Keyword(s):  
Reaction Mechanism ◽  
Natural Rubber ◽  
Butyl Acrylate ◽  
Natural Rubber Latex ◽  
Latex Film ◽  
Cross Linking ◽  
Swelling Ratio ◽  
Cross Link ◽  
Rubber Latex ◽  
The Cross

Natural rubber latex (NRL) and n-butyl acrylate (n-BA) were blended and irradiated at various absorbed doses by gamma rays from Co-60 source at room temperature. The stabilizing effect was determined by measuring the pH and viscosity of NRL with n-BA with the storage time of five weeks. The cross-link density, swelling ratio of the radiation vulcanized rubber film were measured. The cross-link density of the n-BA grafted NRL film was found increasing and the swelling ratio of that film decreasing with the increased absorbed dose. The optimum radiation dose for better cross-linking of natural rubber latex blended with five parts per hundred rubber (phr) n-BA was found 15 kGy absorbed dose. Based on the cross-linking properties a probable cross-linking reaction mechanism for the n-BA grafted natural rubber latex film was developed. Keywords: Natural rubber latex, n-butyl acrylate, Irradiation, Swelling ratio, Cross-link, Reaction mechanism. DOI: 10.3329/diujst.v5i1.4386 Daffodil International University Journal of Science and Technology Vol.5(1) 2010 pp.81-88

scholarly journals Peroxide Cross-linked Soft CompositePrepared from Natural Rubber Latex and Silica Generated in situ

2013 ◽  
Vol 69 (8) ◽  
pp. 159-162
Author(s):  
Atitaya Tohsan ◽  
Pranee Phinyocheep ◽  
Hiroshi Urakawa ◽  
Yuko Ikeda
Keyword(s):  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Rubber Latex

A Comparative Study of Styrene Polymerization in Deproteinized and Undeproteinized Natural Rubber Latex

2002 ◽  
Vol 75 (1) ◽  
pp. 111-118 ◽  
Author(s):  
Nguyen V. Tho ◽  
Mohd Omar Abd Kadir ◽  
Azanam S. Hashim
Keyword(s):  
Reaction Time ◽  
Natural Rubber ◽  
In Situ Polymerization ◽  
Natural Rubber Latex ◽  
Lipid Layer ◽  
Rubber Latex ◽  
Styrene Polymerization ◽  
High Ammonia ◽  
Deproteinized Natural Rubber

Abstract An investigation on in situ polymerization of styrene in deproteinized natural rubber (DPNR) latex and high ammonia natural rubber (HANR) latex was carried out. The ratio of styrene to dry rubber was fixed at 25 : 75 by weight. It was observed that, at reaction temperature of 60 °C and reaction time of 10 hours, the styrene-DPNR system could attain a high conversion of 97% without adding surfactant. The degree of chemical bonding estimated for the resultant polystyrene-DPNR dried material was about 80%. The styrene-HANR system, however, required the addition of surfactant to complete the reaction time; but the conversion was found to be relatively low, in the region of 66%. This low conversion could be attributed to the role played by the protein/lipid layer, which is virtually absent in the styrene-DPNR system.

scholarly journals In situ synthesis of natural rubber latex-supported gold nanoparticles for flexible SERS substrates

RSC Advances ◽  
2015 ◽  
Vol 5 (61) ◽  
pp. 49168-49174 ◽  
Author(s):  
Jinlong Tao ◽  
Dongning He ◽  
Bin Tang ◽  
Lingxue Kong ◽  
Yongyue Luo ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Natural Rubber ◽  
Natural Rubber Latex ◽  
In Situ Synthesis ◽  
Rubber Latex ◽  
Sers Substrates ◽  
Supported Gold Nanoparticles ◽  
Supported Gold ◽  
Hybrid Latex

Natural rubber latex (NRL) from Hevea brasiliensis was used as a matrix to synthesize gold nanoparticles (AuNPs), leading to an organic–inorganic hybrid latex of NRL-supported AuNPs (AuNPs@NRL).

Enhancing Dispersion of Silica Nanoparticles with Ammonium Laurate Surfactant for Natural Rubber Latex Composites

2019 ◽  
Vol 821 ◽  
pp. 74-80
Author(s):  
Wichudaporn Seangyen ◽  
Paweena Prapainainar ◽  
Pongdhorn Sae-Oui ◽  
Surapich Loykulnant ◽  
Peerapan Dittanet
Keyword(s):  
Natural Rubber ◽  
Silica Nanoparticles ◽  
Sol Gel ◽  
Natural Rubber Latex ◽  
Silica Content ◽  
Rubber Matrix ◽  
Rubber Composites ◽  
Rubber Latex ◽  
Beam Radiation

In-situ silica nanoparticles with ammonium laurate surfactant in natural rubber latex composites were characterized to describe the reinforcement mechanism in enhanced mechanical properties. In-situ sol-gel method was introduced to generate silica nanoparticles in natural rubber latex using a mole ratio of water-to-TEOS of 28.9 stirring at room temperature for 24 hours. The addition and effect of adding ammonium laurate surfactant for enhancing dispersion and compatibility between silica nanoparticles and rubber matrix was also studied. The natural rubber latex was then vulcanized by electron beam radiation at 200 kGy. The silica content in rubber composites made in-situ, was analyzed by TGA, showed an increase from 3.08 phr to 8.92 phr, corresponding to addition of TEOS amounts of 10 phr to 30 phr, respectively. The dispersion of silica nanoparticles in rubber matrix with ammonium laurate surfactant was improved and exhibited less aggregation than rubber composites absent of ammonium laurate surfactant as evidenced by SEM-EDX. The increase of silica content in rubber composites exhibited lower swelling ratio and higher crosslink density when compared with neat natural rubber. Also, the modulus at 100% and 300% strain also increased with increasing silica nanoparticles incorporation in contrast to tensile strength.

scholarly journals The Effect of Curing Temperature on Cellulose Nanocrystal Reinforced Natural Rubber Latex

2020 ◽  
Vol 6 (1) ◽  
pp. 20-25
Author(s):  
N. A. H. Jailudin ◽  
Khairatun Najwa Mohd Amin
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Functional Group ◽  
Natural Rubber Latex ◽  
Curing Temperature ◽  
Cellulose Nanocrystal ◽  
Nanocomposite Films ◽  
Cross Linking ◽  
Rubber Latex ◽  
Transmission Electron

Cellulose nanocrystal (CNC) was extracted from filter paper and isolated via sulphuric acid hydrolysis. This CNC was used as reinforcing elements in natural rubber latex (NRL) along with the cross-linking agents to prepare nanocomposite films. The effect of CNC loading on the mechanical properties, functional group presence and the glass transition temperature (Tg) of CNC/NRL nanocomposite at curing temperature of 70°C and 80°C were studied, respectively. CNC size and dimension was characterized using transmission electron microscope (TEM). Significant improvement of Young’s modulus was observed as a result of the addition of CNC loading at 3 wt.% and the Tg only showed a small increase upon the addition of CNC. The best nanocomposite was found at a curing temperature of 80°C with a tensile strength of 144% improvement.

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