蚕丝纤维增强聚乳酸体系中柱晶的形成及结构分析

发布时间：2018-05-27 21:01

  本文选题：聚乳酸 + 蚕丝纤维　； 参考：《高等学校化学学报》2017年09期

【摘要】：采用溶液法制备聚乳酸(PLA)薄膜,并利用偏光显微镜在线研究了不同温度及不同牵引速率下,单根蚕丝纤维(SF)诱导PLA柱晶的形成,并利用显微红外光谱表征柱晶结构.结果表明,当牵引速率大于或等于临界速率时,纤维表面有连续的柱晶生成,反之柱晶不连续;当牵引速率大于临界饱和速率时,柱晶的结晶度和取向度分别趋于稳定值;在等温条件下,随着牵引速率的增大,柱晶的成核诱导期缩短,晶体的成核密度增大,取向度增加;当牵引速率一定时,与130℃相比,温度为120℃时形成柱晶的成核诱导期较短,成核密度更大,结晶度更高,柱晶层的生长更快.
[Abstract]:Polylactic acid (PLA) thin films were prepared by solution method. The formation of PLA columnar crystals induced by single silk fiber SFs at different temperatures and different drawing rates was investigated by polarizing microscope. The columnar structure was characterized by microinfrared spectroscopy. The results show that when the traction rate is greater than or equal to the critical rate, there are continuous columnar crystals on the fiber surface, whereas the columnar crystals are discontinuous when the traction rate is greater than the critical saturation rate, and the crystallinity and orientation degree of the columnar crystals tend to be stable when the traction rate is greater than the critical saturation rate. Under isothermal condition, with the increase of traction rate, the nucleation induction period of columnar crystal is shortened, the nucleation density of crystal increases and the orientation degree increases, and when the traction rate is constant, the nucleation induction period of columnar crystal increases, compared with 130 鈩，

本文编号：1943733