The transitions in polymers, for example, crystalline melting point, glass transition, β-transition, are more complex. These transitions are associated with chemistry structure of molecules, molecular weight, molecular aggregation and etc. Studies of polymer transitions are of profound significance not only on application but also on explaining their origin and relating these transitions to polymer structures. The existence of transitions in many polymers, such as polyethylene, polypropylene, polytetrafluoroethylene and so on, has been investigated. Here we report the crystallization and glass transitions in polyesters containing fluorines.
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