Scalable Preparation of Complete Stereo-Complexation Polylactic Acid Fiber and Its Hydrolysis Resistance |
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| Authors: | Mingtao Sun Siyao Lu Pengfei Zhao Zhongyao Feng Muhuo Yu Keqing Han |
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| Affiliation: | 1.College of Materials Science and Engineering, Donghua University, Shanghai 201620, China;2.State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, Donghua University, Shanghai 201620, China;3.HI-Tech Fiber Group Corporation, Beijing 100020, China;4.Shanghai Different Chemical Fiber Co., Ltd., Shanghai 201502, China |
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| Abstract: | 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. |
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| Keywords: | PLA fiber stereo-complexation tension heat-setting heat resistance hydrolysis resistance |
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