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Synthesis and thermal characterization of poly(dimethyl bicyclobutane-1,3-dicarboxylate) and its copolymers

✍ Scribed by Woon-Seop Choi; Wei Yuan; Anne Buyle Padias; H. K. Hall Jr.

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
141 KB
Volume
37
Category
Article
ISSN
0887-624X

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✦ Synopsis

Dimethyl bicyclobutane-1,3-dicarboxylate was synthesized. Its homopolymer (PDBD) containing exclusively cyclobutane rings in its backbone was prepared by free radical polymerization. The copolymers of this bicyclobutane monomer with methyl methacrylate were also prepared. The glass transition temperature of the homopolymer is 159°C, while those of its copolymers are 143 and 121°C with 75/25 and 50/50 of the P(DBD/MMA) composition ratio, respectively. The T g of PDBD homopolymer is substantially higher than that of commercial PMMA homopolymer despite a lower molecular weight, and is also much higher than that of its monomethyl cyclobutanecarboxylate analogue. These DBD homopolymer and copolymers also show better thermostability than the PMMA homopolymer. The weight-average molecular weight of homopolymer is 37,000. The polydispersities of these polymers are relatively narrow, with the range of 1.6 -1.9. These polymers form clear colorless films resembling PMMA film. The DBD homopolymer film shows a very similar optical cutoff compared to PMMA.

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