POSTIRRADIATION REACTIONS OF MONOMER IN POLY(METHYL METHACRYLATE) - ANALYSIS BY CP MAS C-13 NMR/

Authors
KALACHANDRA S TURNER DT BURGESS JP STEJSKAL EO
Citation
S. Kalachandra et al., POSTIRRADIATION REACTIONS OF MONOMER IN POLY(METHYL METHACRYLATE) - ANALYSIS BY CP MAS C-13 NMR/, Macromolecules, 27(21), 1994, pp. 5948-5949
Citations number
11
Categorie Soggetti
Polymer Sciences
Journal title
Macromolecules → ACNP
ISSN journal
00249297
Volume
27
Issue
21
Year of publication
1994
Pages
5948 - 5949
Database
ISI
SICI code
0024-9297(1994)27:21<5948:PROMIP>2.0.ZU;2-U
Abstract
Small amounts of residual monomer in poly(methyl methacrylate) (PMMA) have been estimated accurately by cross-polarization/magic-angle-spinn ing C-13 NMR spectroscopy. It has been verified that residual monomer decreases when PMMA is gamma-irradiated. In contrast to previous sugge stions, a case is made that removal of monomer is due to slow postirra diation reaction with polymer free radicals. An additional unexpected finding is that radiolysis can result in the formation of additional m onomer which can be detected in samples frozen immediately after irrad iation.