可扩展制备全立体复合聚乳酸纤维及其抗水解性。
Scalable Preparation of Complete Stereo-Complexation Polylactic Acid Fiber and Its Hydrolysis Resistance.
机构信息
College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, Donghua University, Shanghai 201620, China.
出版信息
Molecules. 2022 Nov 7;27(21):7654. doi: 10.3390/molecules27217654.
Due to their high sensitivity to temperature and humidity, the applications of polylactic acid (PLA) products are limited. The stereo-complexation (SC) formed by poly(L-lactic acid) (PLLA) and its enantiomer poly(D-lactic acid) (PDLA) can effectively improve the heat resistance and hydrolysis resistance of PLA products. In this work, the blended melt-spinning process of PLLA/PDLA was carried out using a polyester fiber production line to obtain PLA fiber with a complete SC structure. The effects of high-temperature tension heat-setting on the crystalline structure, thermal properties, mechanical properties, and hydrolysis resistance were discussed. The results indicated that when the tension heat-setting temperature reached 190 °C, the fiber achieved an almost complete SC structure, and its melting point was 222.5 °C. An accelerated hydrolysis experiment in a 95 °C water bath proved that the SC crystallites had better hydrolysis resistance than homocrystallization (HC). The monofilament strength retention rate of SC-190 fiber reached as high as 78.5% after hydrolysis for 24 h, which was significantly improved compared with PLLA/PDLA drawn fiber.
由于对温度和湿度敏感，聚乳酸（PLA）产品的应用受到限制。聚（L-乳酸）（PLLA）与其对映体聚（D-乳酸）（PDLA）形成的立体复合物（SC）可以有效提高 PLA 产品的耐热性和耐水解性。在这项工作中，采用聚酯纤维生产线对 PLLA/PDLA 进行共混熔融纺丝，得到具有完整 SC 结构的 PLA 纤维。讨论了高温拉伸热定形对结晶结构、热性能、力学性能和耐水解性的影响。结果表明，当拉伸热定形温度达到 190°C 时，纤维几乎完全形成 SC 结构，其熔点为 222.5°C。在 95°C 水浴中的加速水解实验证明，SC 晶区比同晶（HC）具有更好的耐水解性。SC-190 纤维的单丝强度保持率在水解 24 小时后高达 78.5%，与 PLLA/PDLA 拉伸纤维相比有显著提高。
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