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Effect of Molecular Weight on the Droplet Size and Rheological Properties of Liquid natural Rubber Emulsion

Rusli Daik, and Shahinas Bidol, and Ibrahim Abdullah, (2007) Effect of Molecular Weight on the Droplet Size and Rheological Properties of Liquid natural Rubber Emulsion. Malaysian Polymer Journal, 2 (1). pp. 29-38. ISSN 18237789

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Affiliations

Universiti Kebangsaan Malaysia. Faculty of Science and Technology. School of Chemical Sciences and Food Technology
Universiti Kebangsaan Malaysia. Faculty of Science and Technology. School of Chemical Sciences and Food Technology
Universiti Kebangsaan Malaysia. Faculty of Science and Technology. School of Chemical Sciences and Food Technology

Abstract

Oil-in-water (o/w) emulsions of LNR with number average molecular weight of 10 000 and 50 000 were prepared using sodium dodecyl sulphate and hexanol as the emulsifier and co-emulsifier respectively. The emulsion droplet size and its distribution for various emulsifier compositions were studied by using particle size analyser and optical microscopy. Results obtained showed that the droplet size of emulsion of LNR with higher molecular weight is greater than that of the lower molecular weight. Within the composition range of emulsifier used, emulsion of LNR with lower molecular weight required less emulsifier to form monomodal droplet size distribution. However, all emulsions prepared showed the characteristics of macroemulsion since that the droplet size greater than 1 micron is formed in all samples. The rheological properties of LNR emulsion with molecular weight of 10 000 and 50 000 were investigated using steady state and oscillatory measurements. The storage modulus G’ and loss modulus G” of the samples were obtained as a function of frequency and temperature. It was found that tangent delta for LNR emulsion with lower molecular weight is greater than that of the higher molecular weight. This showed that LNR emulsion of lower molecular weight was more stable. All samples obtained were stable up to 70°C.

Item Type:Journal
Additional Information:Authors would like to thank the Malaysia Ministry of Science, Technology and Environment for financing this work under IRPA grant. The experimental assistance and testing services provided by the staff of Malaysian Institute for Nuclear Technology Research (MINT) Bangi are also acknowledged
Keywords:Liquid natural rubber, emulsion, rheology, polymer, natural rubber
Subjects:Q Science, Computer Science
T Technology, Engineering
ID Code:6214

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