ポリトリメチレンテレフタレートの結晶弾性率

概要

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Elastic module of crystalline region of polytrimethylene terephthalate (PTT) have been measured by the X-ray diffraction method. The elastic modulus parallel to the chain axis,E_ι was 2.59 GPa, and this value of E_ι is the smallest as compared with those already reported. This is reasonable,judging from the crystal structure of PTT which consists of a highly contracted conformation of molecular chain. The chain extension is considered to occur mainly by the internal rotation of methylene groups. The elastic modulus of the bulk specimen increased with increasing draw ratio and was found to reach to the value of E_ι at the draw ratio over 3.3. On the other hand,the elastic modulus perpendicular to the chain axis,E_ι, was 3.8 GPa. Since many other polymers have been found to exhibit larger E_ι than E_t, PTT is unique in this respect,and it has a characteristic crystal structure in which the intermolecular force has larger effect against deformation than the force holding the contracted molecular conformation.
社団法人日本材料学会の論文
1986-09-15