Effects of various ester groups in γ-radiation degradation of syndiotactic poly(methacrylate)s
✍ Scribed by Limin Dong; David J. T. Hill; James H. O'Donnell; Peter J. Pomery; Koichi Hatada
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 423 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
The y irradiation of poly(methacry1ate)s with various ester groups a t room temperature was investigated by gel permeation chromatography and NMR techniques. The G values for scission and crosslinking for each of the polymers were estimated from the changes in the molecular weights and molecular weight distributions. The new structures formed during y irradiation were examined by 'H-NMR spectroscopy. All of the investigated poly(a1kane methacry1ate)s were found to produce the alkane formates during y irradiation, and for poly(2-methyl heptyl methacrylate) G(S) was less than 4G(X), indicating gel formation in this polymer. In the investigation of poly(benzy1 methacrylate), no formate ester was found, but some small molecule compounds formed from the benzyl radical were detected. The benzyl group was also found to stabilize the polymer against radiation damage. 0 1996