Abstract
The poly(butadiene terephthalate) (PBT)-poly(tetramethylene glycol) (PTMG) segmented copolymers synthesized both by ordinary monomeric method (M method) and polymeric method (P method) have been studied by NMR. By using 13C NMR based on the chemical shifts of aromatic quaternary carbons, the segment sequence and the compositions of segmented copolymers are able to be precisely determined, even with unpurified samples. In contrast, only the apparent composition was obtained using 1H NMR, because the formation of long sequence of soft segment and the effect of polyester are not taken into account in 1H NMR measurement. Formation of long sequence of soft segment is more likely in PBT-PTMG with lower hard segment content (PBT %).
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