Steric control of gelation in monovinyl-multivinyl polymerization leading to preparation of self-crosslinkable polymer having pendant vinyl groups
✍ Scribed by Akira Matsumoto; Eiji Nishi; Masayoshi Oiwa; Jun-Ichi Ikeda
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 288 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0014-3057
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✦ Synopsis
A~tract--Steric effects of long-chain alkyl groups on a radical vinyl polymerization including a multivinyl monomer is discussed in connection with control of gelation. Three kinds of alkyl methacrylate (RMA) were added to the system of methyl methacrylate with ethylene dimethacrylate (EDMA) in order to examine the steric effect of the long-chain alkyl group of RMA on the gelation. Study of the significance of steric effects on gelation was extended to the copolymerization of lauryl methacrylate (LMA) with several polyethylene glycol dimethacrylates (PEGDMA); gelation depended on the number of oxyethylene units (n) of PEGDMA as a crosslinker and no gelation was observed up to n = 4. Finally, LMA EDMA copolymerization behaviour was examined in detail by changing monomer concentration and the amount of EDMA; the occurrence of intermolecular crosslinking leading to gelation is obviously suppressed by the steric effect of the long-chain alkyl group, providing a new way for the preparation of novel self-crosslinkable polymers having pendant vinyl groups.