Observations obtained by other techniques were confirmed by DSC analyses. As the length of the methylene chain increased, T m decreased, and crystallinity, heat capacity, and heat of fusion increased. The T m and crystallinity of the isophthalate esters were lower than for the corresponding terephthalate esters. The values for an odd‐numbered methylene sequence were lower than for the adjacent even‐numbered members. A model was used to calculate the heat of fusion of theoretically 100% crystalline poly(hexamethylene isophthalate) and poly(decamethylene isophthalate).
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Yip et al. (1976) studied this question.
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