聚羟基丁酸酯球晶的微观结构及其对力学性能的影响

本文采用基于数字图像相关计算技术的显微数字分析系统,结合原子力显微镜等,实验研究了晶态高聚物聚羟基丁酸酯(PHB)的细观结构及对其力学性能的影响规律.结果发现:实验用的PHB球晶是台阶式生长或螺旋式生长,其生长台阶高度差在200nm～500nm之间;PHB球晶同心圆环随着结晶温度的提高,同心圆环的环间距增大.球晶结晶度、球晶尺寸对冲击强度、拉伸强度以及断裂伸长率的影响呈线性关系.

Experimental Investigation on Microscopic Structure and Mechanical Properties of PHB

This paper investigates microscopic structure of crystalline higher polymer PHB and its influence on the mechanical properties of the materials on the basis of adopting micro digital analytic system. Atom force microscope, scanning electron microscope, impact and tension device, and sclerometer are utilized in the experiment. The result of this experiment indicates two conclusions, one of which is that concentric annulnses appearing in PHB spherocrystal in orthogonal polarized light are as a result of difference in height of 200nm -500nm between growth steps by reason of step-like or auger-type growing of PHB spherocrystal. Another is that the distances between concentric annulnses increased with crystallizing point increment. Crystallinity and size of spherocrystal is linear relation to impact strength, tensile-strength, and extensibility, and empirical equation is obtained in terms of trial curve.