Abstract
The extent of cooperativity and the origin of this cooperative relaxation in bisphenol A polycarbonate was investigated using polycarbonates modified to different extents by inserting units of bulkier monomer analogue, tetramethylbisphenol A, into the polymer main chain at regular intervals. The dynamic mechanical spectra of the synthesized homologues suggest that the intrachain interactions are the dominant factor of this cooperative relaxation and the extent of the cooperation is about seven repeat units
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