Tensile and tear strengths of post-vulcanised skim natural rubber latex films

Faiza A., . and Samsuri A., . and Veerasamy D., . and Rasyiqah A. Rahim, . and Kamarun D., . Tensile and tear strengths of post-vulcanised skim natural rubber latex films. pp. 159-169. ISSN 1511-1768

The effect of blending NR skim latex with NR latex concentrate on tensile and tear strengths of post-vulcanised films were investigated. The blends were compared against the controls viz NR latex concentrate and NR skim latex concentrate. The tensile stresses at 100 strain (M100) 300 strain (M300) and 500 strain (M500) all show the same trend where the NR skim latex concentrate gave the highest value and NR latex concentrate film gave the lowest value. In the case of latex blends the M100 M300 and M500 increased with increasing proportion of NR skim latex in the blend. The increase might be associated with the hard protein domains inherited in the skim latex. The tensile strength is also affected by the proportions of skim latex in the blend where it decreases as the proportion of skim latex in the blend increases. Tear measurements were done by using trouser test-pieces at six different crosshead speeds ranging from 50 to 500 mm per minute at 23C. The tear behavior showed contrasting behavior to that of tensile strength. The 80:20 and 70:30 blend ratios gave higher tearing energies than NR latex concentrate film. It was observed that the extent of tear deviations was larger as the proportion of skim latex in the blend was increased. The non-rubbers especially the hard protein domains inherited in the skim latex might be responsible for the extreme knotty tearing observed. The tearing energy was highest at the slowest crosshead speed and decreased as the crosshead speed was increased since definite time is required for the strengthening structures to develop around the tear tip.

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Abstract

The effect of blending NR skim latex with NR latex concentrate on tensile and tear strengths of post-vulcanised films were investigated. The blends were compared against the controls viz NR latex concentrate and NR skim latex concentrate. The tensile stresses at 100 strain (M100) 300 strain (M300) and 500 strain (M500) all show the same trend where the NR skim latex concentrate gave the highest value and NR latex concentrate film gave the lowest value. In the case of latex blends the M100 M300 and M500 increased with increasing proportion of NR skim latex in the blend. The increase might be associated with the hard protein domains inherited in the skim latex. The tensile strength is also affected by the proportions of skim latex in the blend where it decreases as the proportion of skim latex in the blend increases. Tear measurements were done by using trouser test-pieces at six different crosshead speeds ranging from 50 to 500 mm per minute at 23C. The tear behavior showed contrasting behavior to that of tensile strength. The 80:20 and 70:30 blend ratios gave higher tearing energies than NR latex concentrate film. It was observed that the extent of tear deviations was larger as the proportion of skim latex in the blend was increased. The non-rubbers especially the hard protein domains inherited in the skim latex might be responsible for the extreme knotty tearing observed. The tearing energy was highest at the slowest crosshead speed and decreased as the crosshead speed was increased since definite time is required for the strengthening structures to develop around the tear tip.

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Item Type:	Article
AGROVOC Term:	Natural rubber
AGROVOC Term:	Latex
AGROVOC Term:	Byproducts
AGROVOC Term:	Blending
AGROVOC Term:	Vulcanization
AGROVOC Term:	Ultrafiltration
AGROVOC Term:	Processing
AGROVOC Term:	Measurement
AGROVOC Term:	Sulphur
AGROVOC Term:	Strength
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 05:28
URI:	http://webagris.upm.edu.my/id/eprint/23653

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