Citation
Cudby P. E. F., . and Davies R. T., . Microstructure of peroxide prevulcanised latex films. pp. 67-81. ISSN 0127-7065
Abstract
The technique of styrene swelling/polymerisation/electron microscopy has been used to study the structure of films made from peroxide prevulcanised latex (PPVL). The results show that in PPVL which has been made by the usual method i.e. by using an activator in the aqueous phase the distribution of crosslinked rubber is very different from that in sulphur-cured or radiation-cured prevulcanisates. In PPVL it can be seen that the small rubber particles are vulcanised in their entirety but the larger particles show a very different structure. Each large particle is only vulcanised in a layer near its surface and the centre of the particle is unvulcanised or poorly vulcanised. This observation has been confirmed by solvent-swelling measurements on films made from different particle size fractions of PPVL. This phenomenon could explain why PPVL films show a high degree of tension set. By contrast in a PPVL made using a more rubber-soluble thermally-activated peroxide (dicumyl peroxide) all the rubber particles were crosslinked throughout.
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Abstract
The technique of styrene swelling/polymerisation/electron microscopy has been used to study the structure of films made from peroxide prevulcanised latex (PPVL). The results show that in PPVL which has been made by the usual method i.e. by using an activator in the aqueous phase the distribution of crosslinked rubber is very different from that in sulphur-cured or radiation-cured prevulcanisates. In PPVL it can be seen that the small rubber particles are vulcanised in their entirety but the larger particles show a very different structure. Each large particle is only vulcanised in a layer near its surface and the centre of the particle is unvulcanised or poorly vulcanised. This observation has been confirmed by solvent-swelling measurements on films made from different particle size fractions of PPVL. This phenomenon could explain why PPVL films show a high degree of tension set. By contrast in a PPVL made using a more rubber-soluble thermally-activated peroxide (dicumyl peroxide) all the rubber particles were crosslinked throughout.
Additional Metadata
| Item Type: | Article |
|---|---|
| AGROVOC Term: | Latex |
| AGROVOC Term: | Natural rubber |
| AGROVOC Term: | Peroxides |
| AGROVOC Term: | Polymerization |
| AGROVOC Term: | Centrifugation |
| AGROVOC Term: | Fractionation |
| AGROVOC Term: | Stirring |
| AGROVOC Term: | Swelling |
| AGROVOC Term: | Styrene |
| AGROVOC Term: | Flushing |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 06:28 |
| URI: | http://webagris.upm.edu.my/id/eprint/23337 |
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