Stress relaxation behaviour of natural rubber vulcanisates containing non-rubber constituents

Alias O., . and Murray G. A. W., . and Birley A. W., . Stress relaxation behaviour of natural rubber vulcanisates containing non-rubber constituents. pp. 183-199. ISSN 0127-7065

Natural rubber (NR) which is derived from latex of Hevea brasiliensis tree contains about 35 of non-rubber constituents. The presence of these non-rubber constituents which are mostly proteinaceous materials affect the sensitivity of rubber to water thereby affecting properties such as elastic modulus and stress-relaxation. Studies using vulcanised unfilled NR showed that changes in relative humidity of the sample gave variations in elastic modulus and stress-relaxation of vulcanisates. The variability was due to the presence of certain types of amino-acid; their presence increases the elastic modulus and reduces the rate of relaxation of NR vulcanisates. These were due to the formation of ionic crosslinks; drying the rubber intensifies the ionic interactions and effectively increases the apparent crosslink density thereby reducing the rate of relaxation.

Full text available from: Official URL: http://vitaldoc.lgm.gov.my:8060/vital/access/servi...

Abstract

Natural rubber (NR) which is derived from latex of Hevea brasiliensis tree contains about 35 of non-rubber constituents. The presence of these non-rubber constituents which are mostly proteinaceous materials affect the sensitivity of rubber to water thereby affecting properties such as elastic modulus and stress-relaxation. Studies using vulcanised unfilled NR showed that changes in relative humidity of the sample gave variations in elastic modulus and stress-relaxation of vulcanisates. The variability was due to the presence of certain types of amino-acid; their presence increases the elastic modulus and reduces the rate of relaxation of NR vulcanisates. These were due to the formation of ionic crosslinks; drying the rubber intensifies the ionic interactions and effectively increases the apparent crosslink density thereby reducing the rate of relaxation.

[error in script]

Item Type:	Article
AGROVOC Term:	Rubber
AGROVOC Term:	Hevea brasiliensis
AGROVOC Term:	Natural rubber
AGROVOC Term:	Latex
AGROVOC Term:	Stress
AGROVOC Term:	Vulcanization
AGROVOC Term:	Elasticity
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23369

Actions (login required)

View Item