NR latex particle size and its molecular weight from young and mature Hevea trees

Kovuttikulrangsie Saovanee, . and Tanaka Yasuyuki, . NR latex particle size and its molecular weight from young and mature Hevea trees. pp. 150-159. ISSN 1511-1768

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 um while mature trees showed particle sizes of up to 4 mm (from 0.04 mm to 4 mm). 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 um to 0.65 um. 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 GT 1 PR 255 PR 261 and KRS 156) regularly tapped trees presented mode average particle sizes of about 1.0 um. 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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Abstract

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 um while mature trees showed particle sizes of up to 4 mm (from 0.04 mm to 4 mm). 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 um to 0.65 um. 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 GT 1 PR 255 PR 261 and KRS 156) regularly tapped trees presented mode average particle sizes of about 1.0 um. 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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Item Type:	Article
AGROVOC Term:	Natural rubber
AGROVOC Term:	Latex
AGROVOC Term:	Hevea
AGROVOC Term:	Particle size
AGROVOC Term:	Molecular weight
AGROVOC Term:	Measurement
AGROVOC Term:	Clones
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23299

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