The effects of isomerisation and vulcanisation temperature on the tear strength of natural rubber latex film.

Azemi S., . The effects of isomerisation and vulcanisation temperature on the tear strength of natural rubber latex film. pp. 16-24. ISSN 1511-1768

Natural rubber (NR) is predominantly (100) cis 1 4 polyisoprene. As a consequence of its regular microstructure vulcanised NR can undergo strain-crystallisation. In the case of NR latex film strain-crystallisation promotes knotty tearing a peculiar feature which is commonly observed in reinforcing black-filled NR vulcanisate but not in NR unfilled (gum) vulcanisate prepared from dry rubber. Knotty tearing enhances the tear strength of NR latex film where its tearing energy can reach 100 kJm 2. The effects of isomerisation and temperature of vulcanisation on the tear strength of NR latex film were investigated. Isomerisation of NR latex disturbs the regularity of the microstructure and thus inhibits strain-crystallisation. In the absence of strain-crystallisation NR latex film did not produce knotty tearing. Consequently its tearing energy was relatively low (1.0 kJm 2 12 kJm 2) depending on the speed of the test. The tearing energy of NR latex film was also found to decrease as the temperature of vulcanisation was increased which might be attributed to lower concentration of polysulphidic type of crosslinks at high vulcanisation temperature than that produced at low temperature vulcanisation.

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Abstract

Natural rubber (NR) is predominantly (100) cis 1 4 polyisoprene. As a consequence of its regular microstructure vulcanised NR can undergo strain-crystallisation. In the case of NR latex film strain-crystallisation promotes knotty tearing a peculiar feature which is commonly observed in reinforcing black-filled NR vulcanisate but not in NR unfilled (gum) vulcanisate prepared from dry rubber. Knotty tearing enhances the tear strength of NR latex film where its tearing energy can reach 100 kJm 2. The effects of isomerisation and temperature of vulcanisation on the tear strength of NR latex film were investigated. Isomerisation of NR latex disturbs the regularity of the microstructure and thus inhibits strain-crystallisation. In the absence of strain-crystallisation NR latex film did not produce knotty tearing. Consequently its tearing energy was relatively low (1.0 kJm 2 12 kJm 2) depending on the speed of the test. The tearing energy of NR latex film was also found to decrease as the temperature of vulcanisation was increased which might be attributed to lower concentration of polysulphidic type of crosslinks at high vulcanisation temperature than that produced at low temperature vulcanisation.

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Item Type:	Article
AGROVOC Term:	Vulcanization
AGROVOC Term:	Temperature
AGROVOC Term:	Tears
AGROVOC Term:	Natural rubber
AGROVOC Term:	Latex
AGROVOC Term:	Microstructure (morphology)
AGROVOC Term:	Mechanical properties
AGROVOC Term:	Carbon black
AGROVOC Term:	Isomerization
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 03:17
URI:	http://webagris.upm.edu.my/id/eprint/23107

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