レーザ干渉法によるポリオキシメチレン(POM)超延伸繊維の弾性・線膨張の測定

抄録

Tensile moduli and thermal expansion coefficients of newly developed super-drawn polyoxymethylene (POM) fibers were measured by the same laser interferometric measurement system in the temperature range between room temperature and 90°C. The main results of the experiment are summarized as follows : (1) Tensile moduli increase with drawn-ratio, while they decrease after annealing at 160°C. (2) Temperature coefficients of tensile moduli of super-drawn fibers are nearly independent of drawn-ratio and annealing treatment. (3) Thermal expansion coefficients of super-drawn fibers are negative above room temperature. (4) Absolute values of thermal expansion coefficients decrease with drawn-ratio, and annealing also reduces their absolute values. Above results can be qualitatively explained by the mechanical model which assumes the existence of tie molecule chains.