尼龙微粉对生物降解聚丁二酸丁二醇酯结晶性能的影响

Effect of Nylon Powder on the Crystallization Property of Biodegradable Poly(butylene succinate)

采用溶液共混法制备了不同尼龙微粉含量的聚丁二酸丁二醇酯(PBS)/尼龙微粉共混物,X射线衍射测试的结果表明尼龙微粉的加入不改变PBS结晶晶体结构;进一步采用偏光显微镜进行结晶行为的观测,结果表明尼龙微粉可诱导PBS在微粉表面快速成核结晶,成核密度增大,并且晶体只能沿着近乎垂直于微粉表面的方向生长;但是在相同结晶温度下,不同尼龙微粉含量的PBS复合材料具有相同的晶体生长速率。同时差示扫描量热研究也证实了PBS在尼龙微粉表面附生结晶的行为,并且随尼龙微粉含量的增加,其结晶峰先向高温方向移动,随后向低温方向移动,结晶度小幅降低。

Poly (butylene succinate)(PBS)/nylon powders blending with different contents of nylon powder were prepared by solution blending method. The results of X-ray diffraction (XRD) show that the addition of nylon micropowder does not change the crystalline structure of PBS. And the crystallization behavior of PBS was further observed by polarizing microscope (POM), which show that nylon powder promotes the nucleation of PBS. Due to a large nucleation density, the crystals only grow in the direction perpendicular to the surface of powder. The contents of nylon powder do not change the crystal growth rate at the same temperature. With the increase of the content of nylon powder, the crystallization peak first moves to high temperature, then moves to low temperature, and the crystallinity decreases slightly as presented by DSC curves.