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Copolymerization of methyl methacrylate and urethane methacrylate—II

✍ Scribed by Alok Kumar Tyagi; Veena Choudhary; I.K. Varma

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
229 KB
Volume
28
Category
Article
ISSN
0014-3057

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✦ Synopsis

A methacrylate monomer (MAUN) having a pendant urethane linkage was prepared by reacting tolylene diisocyanate (TDI), 2-naphthol and 2-hydroxyethyl methacrylate (HEMA). Photopolymerization in the absence of photosensitizer in the temperature range 32 to 62 ° was investigated using differential photocalorimetry. The activation energy for photopolymerization was found to be 20.4 kJ/mol. Homopolymerization and copolymerizations of MAUN with MMA were also carried out in tetrahydrofuran at 60 ° using benzoyl peroxide as initiator. The reactivity ratios determined from copolymer compositions derived from nitrogen contents were 0.2 +_ 0.1 (MMA) and 5.6 + 0.3 (MAUN) indicating that the copolymer was enriched in MAUN relative to the feed. The effect of copolymer composition on thermal stability in nitrogen was also evaluated.

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