Citation
Hafsah M. G., . and Daniels E. S., . and Klein A., . and El-Aasser M. S., . Miniemulsion polymerisation of a bifunctional macromonomer. pp. 28-37. ISSN 1511-1768
Abstract
Evaluation of the miniemulsion polymerisation of a hydmphobic bifunctional macromonomer was undertaken. The rate of polymerisation of the macromonomer was faster when the reaction was carried out using a water-soluble initiator potassium persulphate KPS than when an oil-soluble initiator 2 2-azobis(isobutyronitrile) AIBN was used. Unsaturation peaks were no longer observable in the 1H NMR spectrum of the reacted macromonomer when the gel content was -50. In both cases depending on the reaction time cross-linked products were obtained. For the KPS-initiated homopolymerisation 50 - 60 gel content was already obtained by (he first hour of reaction while similar gel development in the macromonomer was only observed after 6 h 12 h of polymerisation when AIBN was used. The polymerised macromonomer (using AIBN as initiator) exhibited a distinct physical change when water was removed only when (he gel content was -50 which- corresponded to a substantial loss of unsaturation peaks in the 1H NMR spectrum. The gel content remained low ( 10) earlier in the polymerisation despite the steady increase in the reaction of the double bonds of the macromonomer.
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Abstract
Evaluation of the miniemulsion polymerisation of a hydmphobic bifunctional macromonomer was undertaken. The rate of polymerisation of the macromonomer was faster when the reaction was carried out using a water-soluble initiator potassium persulphate KPS than when an oil-soluble initiator 2 2-azobis(isobutyronitrile) AIBN was used. Unsaturation peaks were no longer observable in the 1H NMR spectrum of the reacted macromonomer when the gel content was -50. In both cases depending on the reaction time cross-linked products were obtained. For the KPS-initiated homopolymerisation 50 - 60 gel content was already obtained by (he first hour of reaction while similar gel development in the macromonomer was only observed after 6 h 12 h of polymerisation when AIBN was used. The polymerised macromonomer (using AIBN as initiator) exhibited a distinct physical change when water was removed only when (he gel content was -50 which- corresponded to a substantial loss of unsaturation peaks in the 1H NMR spectrum. The gel content remained low ( 10) earlier in the polymerisation despite the steady increase in the reaction of the double bonds of the macromonomer.
Additional Metadata
| Item Type: | Article |
|---|---|
| AGROVOC Term: | Polymerization |
| AGROVOC Term: | Emulsions |
| AGROVOC Term: | Hydrophobicity |
| AGROVOC Term: | Potassium sulphate |
| AGROVOC Term: | Cross-linking |
| AGROVOC Term: | Chemical structure |
| AGROVOC Term: | Toluene |
| AGROVOC Term: | Chilling |
| AGROVOC Term: | Chloroform |
| AGROVOC Term: | Solvents |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 06:28 |
| URI: | http://webagris.upm.edu.my/id/eprint/23186 |
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