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Summary A double endothermic peak appears in the DSC curve of a PTHF oligomer. In order to investigate this phenomenon, a two-component blend of PTHF was prepared with a number average molecular mass of M=1400, and the double endothermic phenomena were investigated by TM-DSC. The larger the amount of the long chain component in the PTHF blend, the smaller the difference between the C p-T curve and the normal DSC curve. The amounts of endothermic energy ?H endo,1, ?H endo,2 and exothermic energy ?H exo,1, ?H exo,2 in each peak at infinite modulation frequency were estimated.

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