Structure of Thermoplastic Copolyester Elastomers

1 Block-length Distributions of Poly(ether ester)s 

Higashiyama et al. [27] showed that the distribution of block-lengths and average block length of TPEEs could be precisely determined based on the chemical shifts of aromatic quaternary carbons from NMR measurements. They have shown that the formation 

An interesting finding is that the sequence length distribution has an impact on the biodegradability properties of TPEEs. In an analysis of structure of aliphatic/aromatic TPEEs, based on PBT and aliphatic polyfbutylene adipate) (PBA), studied by high resolution NMR, it was found that 35-55 mol % of terephthalic acid in TPEEs was suitable from the point of view of biodegradability and mechanical and physical properties [27,28]. 

The phase behavior of poly(ether ester)s has been extensively studied since their mechanical properties are affected by the phase structure and the morphology of the samples. It is also known that chemical structure and processing conditions affect the degree of phase separation. Also, the change in morphology of TPEEs could be obtained by annealing or mechanical deformation. 

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