Abstract - NR latex particle size and its molecular weight from young and mature hevea trees


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	Publications of MRB Latest Publications MRB Digest Journal of Rubber Research 3^rd Qtr 2008 Vol 11(3) 2^nd Qtr 2008 Vol 11(2) 1^st Qtr 2008 Vol 11(1) 4^th Qtr 2007 Vol 10(4) 3^rd Qtr 2007 Vol 10(3) 2^nd Qtr 2007 Vol 10(2) 1^st Qtr 2007 Vol 10(1) 1^st Qtr 2006 Vol 9(1) 2^nd Qtr 2006 Vol 9(2) 3^rd Qtr 2006 Vol 9(3) 4^th Qtr 2006 Vol 9(4) Submit paper/article Order Form	Abstract NR Latex Particle Size and Its Molecular Weight from Young and Mature Hevea Trees The age of young NR Hevea trees has an influence on the size of latex particles. Young seedling trees aged less than 3 year had small rubber particles of sizes less than 1 µm, while mature trees showed particle sizes of up to 4 µm (from 0.04 µm to 4 µm). NR latex particles from virgin trees of clones RRIM 600, aged from 1 to 7 years showed the average particle size distribution of about 0.30 µm to 0.65 µm. The average molecular weight (Mw) dramatically increased from 3.3 X 10⁵ to 12.0 X 10⁵. The polydispersity (Mw/Mn) or molecular weight distribution of rubber was remarkably wide, between 3 and 10. Different clones of 25-year-old (NATAWE 208, AVROS 2037, RRIC 6, GT1, PR 255, PR 261 and KRS 156) regularly tapped trees presented mode average particle sizes of about 1.0 µm. The average molecular weight (Mw) was from about 6.7 X 10⁵ to 3.0 X 10⁶ and the polydispersity (Mw/Mn) was extremely extensive between 5 and 11.
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