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Synthesis and properties of 4,4′-biphenyldicarboxylic acid and 2,6-naphthalenedicarboxylic acid

✍ Scribed by Jawed Asrar

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

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✦ Synopsis

This article describes the synthesis and the properties of polyesters and copolyesters prepared from ethylene glycol, terephthalic acid, 4,4Ј biphenyldicarboxylic acid (BDA), and 2,6-naphthlenedicarboxylic acid (NDA). The effect of incorporating varying levels of BDA and NDA on polyethylene terephthalate (PET) is described. Depending on the concentration, incorporation of BDA into PET leads to an improvement in glass transition temperature (T g ), strength, modulus, and barrier properties. Copolymers of PET containing up to about 50% BDA derived units are clear and have T g 's ranging from 85 to 105°C, making them suitable for applications where a high T g along with clarity is important. Copolymers with higher BDA concentration are highly crystalline, with high rates of crystallization from the melt. Copolymerization of NDA with oligoethyleneterephthalate leads to copolymers that are generally amorphous. Crystallinity can be developed in copolymers with low concentration of NDA by thermal annealing.

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