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

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.

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

RSC Advances ◽

10.1039/c5ra05681k ◽

2015 ◽

Vol 5 (61) ◽

pp. 49168-49174 ◽

Cited By ~ 10

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).

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

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.821.74 ◽

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.

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