| 摘要 |
A crystalline polymer exhibiting crystal transition in the solid phase state, which satisfies the relationship defined by the formula 150>DeltaHtr>1.6Ttr-3.5 (1) (wherein DeltaHtr represents the endotherm (J/g) accompanying crystal transition and Ttr represents the crystal transition temperature (° C.)). This crystalline polymer has a weight average molecular weight of 600 thousand or less and a crystal transition temperature (Ttr) of 67° C. or below. Since this crystalline polymer has a low phase transition temperature, a high heat of a crystal transition, and a high melting point, the potential utility thereof as a switching element or a thermal storage material used at around normal environment temperatures (20 to 50° C.) is high.
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