Structure Mediation and Properties of Poly(l-lactide)/Poly(d-lactide) Blend Fibers
Structure Mediation and Properties of Poly(l-lactide)/Poly(d-lactide) Blend Fibers
复制标题
聚(L-丙交酯)/聚(D-丙交酯)共混纤维的结构调节和性能
DOI：
10.3390/polym10121353
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发表时间：
2018-12-01
期刊：
影响因子：
5
通讯作者：
Zhang, Xiuqin
中科院分区：
文献类型：
--
作者：
Yang, Bo;Wang, Rui;Zhang, Xiuqin
通过熔融纺丝制备聚（l-乳酸）（PLLA）和聚（d-乳酸）（PDLA）共混初纺纤维（50/50，wt.%）。采用广角X射线散射(WAXS)和差示扫描量热法(DSC)研究了聚(l-乳酸)/聚(d-乳酸)(PLLA/PDLA)初生纤维在温度和应力下的结构调节和性能。结果表明，在60℃拉伸和200℃退火的PLLA/PDLA共混纤维中可以形成高取向的立构复合物(SC)晶体。然而，在80℃的拉伸温度下，只能形成较低取向的SC晶体。对于在60℃下拉伸两次的PLLA/PDLA共混纤维(PLLA/PDLA-60-2)，SC晶体的结晶度随着退火温度在200至215℃范围内的增加而增加，而取向度略有下降。当退火温度为210℃时，PLLA/PDLA-60-2光纤中SC晶体的结晶度和取向度分别达到51%和-0.39。此外，PLLA/PDLA-60-2-210纤维即使在200℃下也表现出优异的耐热性能。结果表明，具有高SC晶体含量的取向PLLA/PDLA共混纤维可以在短时间内进行调控。
Poly(l-lactic acid) (PLLA) and poly(d-lactic acid) (PDLA) blend as-spun fibers (50/50, wt.%) were prepared by melt spinning. Structure mediation under temperature and stress and properties of poly(l-lactic acid)/poly(d-lactic acid)(PLLA/PDLA) as-spun fibers were investigated by wide-angle X-ray scattering (WAXS) and differential scanning calorimetry (DSC). The results show that highly oriented stereocomplex (SC) crystals can be formed in PLLA/PDLA blend fibers drawn at 60 degrees C and annealed at 200 degrees C. However, at drawn temperature of 80 degrees C, only lower oriented SC crystals can be formed. For PLLA/PDLA blend fibers drawn twice at 60 degrees C (PLLA/PDLA-60-2), the crystallinity of SC crystals increases with annealing temperature in the range of 200 to 215 degrees C, while the degree of orientation decreases slightly. When the annealing temperature is 210 degrees C, the crystallinity and orientation of SC crystals in PLLA/PDLA-60-2 fibers reach 51% and -0.39, respectively. Moreover, PLLA/PDLA-60-2-210 fibers exhibit excellent heat-resistant property even at 200 degrees C. The results indicate that the oriented PLLA/PDLA blend fibers with high SC crystals content can be regulated in a short time.