摘要
将聚羟基丁酸戊酸酯(PHBV)、左旋聚乳酸(PLLA)以不同比例共混,采用干法纺丝工艺制备复合可降解纤维。运用扫描电子显微镜和X射线衍射仪对纤维的微观形貌和结构进行分析。确定干法纺丝工艺参数为:卷绕速度28.5 m/min,拉伸倍数3倍,拉伸温度90℃。当PHBV与PLLA质量比为1∶1时,所得纤维强度可达2.8 c N/dtex。通过力学以及结晶性能的变化等研究纤维的降解性能。随降解时间的增加断裂强度与断裂伸长率均呈下降趋势,纤维的规整结构遭到破坏,结晶度有所下降。共混比不同的复合纤维在同一周期内其降解程度不同,当PLLA质量分数达80%,降解周期为50 d时,呈现脆性断裂,断裂强度仅为降解前的1/3。
Composite biodegradablefibers were obtained by dry spinning of polyhydroxybutyrate valerate（PHBV） and poly-L-lactic acid（PLLA） blending with different proportion. The microstructures of the fibers were analyzed by scanning electron microscope and X-ray diffraction. The results show that the dry spinning process parameters are as follows：wind speed is 28.5 m/min,fiber draw ratio is 3 times,stretching temperature is 90℃. When the proportion offiber wasw（PHBV）：w（PLLA）=1：1,the break strength can reach 2.8 cN/dtex. The degradation of thefibers was studied by changes of the mechanics and the crystal properties. The breaking strength and elongation at break decrease with the increase of degradation period, and the regular structure of the fiber is destroyed and the crystallinity decreases .The degradable performance of the different compositefibers is different in the same period. When the degradation lasts 50 d and thefibers with PLLA content is 80%,breaking strength becomes one-third of the original,and has the characteristic of the brittle fracture.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2015年第12期92-95,共4页
Engineering Plastics Application
基金
陕西省教育厅专项科研计划项目(14JK1569)
关键词
复合可降解纤维
结晶度
断裂强度
断裂伸长率
composite biodegradablefiber
crystallinity
breaking strength
elongation at break
