Wang Guoqiang, Zhang Li, Chi Xiang
College of Material Science and Engineering, Jilin Jianzhu University, Changchun 130118, China.
College of Material Science and Engineering, Jilin Jianzhu University, Changchun 130118, China.
Int J Biol Macromol. 2023 Apr 15;234:123702. doi: 10.1016/j.ijbiomac.2023.123702. Epub 2023 Feb 16.
Because of superior tensile strength, biodegradability, and biocompatibility, poly(lactic acid) (PLA) has emerged as one among the growth-oriented biodegradable materials. But it has been limited to some extent in practical applications due to poor ductility. Consequently, in order to improve the drawback of poor ductility of PLA, ductile blends were obtained by melt-blending of poly(butylene succinate-co-butylene 2,5-thiophenedicarboxylate) (PBSTF25) with PLA. PBSTF25 has a good improvement on the ductility of PLA due to its excellent toughness. Differential scanning calorimetry (DSC) showed that PBSTF25 promoted the cold crystallization of PLA. Wide-angle X-ray diffraction (XRD) results revealed that PBSTF25 experienced stretch-induced crystallization throughout the stretching procedure. Scanning electron microscopy (SEM) showed neat PLA had a smooth fracture surface, but the blends had rough fracture surface. PBSTF25 can improve the ductility and processing properties of PLA. When the addition of PBSTF25 reached 20 wt%, tensile strength was 42.5 MPa and elongation at break increased to 156.6 %, approximately 19 times as much as PLA. The toughening effect of PBSTF25 was better than that of poly(butylene succinate).
由于具有优异的拉伸强度、生物降解性和生物相容性，聚乳酸（PLA）已成为一种具有发展前景的生物可降解材料。但由于其延展性较差，在实际应用中受到了一定限制。因此，为了改善PLA延展性差的缺点，通过将聚（丁二酸丁二醇酯-co-2,5-噻吩二甲酸丁二醇酯）（PBSTF25）与PLA熔融共混获得了韧性共混物。PBSTF25因其优异的韧性对PLA的延展性有良好的改善作用。差示扫描量热法（DSC）表明PBSTF25促进了PLA的冷结晶。广角X射线衍射（XRD）结果显示PBSTF25在整个拉伸过程中经历了拉伸诱导结晶。扫描电子显微镜（SEM）显示纯PLA具有光滑的断裂表面，而共混物具有粗糙的断裂表面。PBSTF25可以改善PLA的延展性和加工性能。当PBSTF25的添加量达到20 wt%时，拉伸强度为42.5 MPa，断裂伸长率提高到156.6%，约为PLA的19倍。PBSTF25的增韧效果优于聚丁二酸丁二醇酯。
