Preparation and Properties of Asymmetric Stereocomplex Poly(Lactic Acid)/Cotton Fiber Bio-based Composites
Sheng Linjie1, Cheng Hongda2, Li Yi1, Han Changyu2, Qi Guozhen3
1. School of Materials Science and Engineering, Jilin Jianzhu University, Changchun 130118, China;
2. Laboratory of Polymer Materials Engineering, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
3. SINOPEC Shanghai Research Institute of Petrochemical Technology Company Limited, Shanghai 201208, China
Abstract：Poly(lactic acid) (PLA) has great application potential in packaging, textile, biomedicine and other fields owing to its biocompatibility, biodegradability and renewable raw material sources. However, its relatively slow crystallization rate and low melt strength limit its further application. To improve the crystallization behavior and melt rheological properties of PLA, poly(L-lactic acid)/poly(D-lactic acid)/cotton fiber (PLLA/PDLA/CF) bio-based composites were prepared via melt blending. The results showed that stereocomplex polylactic acid (SC-PLA) crystals formed between PLLA and PDLA during melt blending served as effective nucleating agents for PLA, which could enhance the crystallinity and crystallization rate of the composites. The synergistic effect of cotton fiber (CF) and stereocomplex (SC) crystals optimized the melt rheological properties of PLLA/PDLA/CF composites, while their melt elasticity and viscosity increased with the rising content of PDLA. Moreover, the storage modulus and Young’s modulus of PLLA/PDLA/CF composites were significantly higher than those of pure PLLA. Overall, the PLLA/PDLA/CF composites exhibited improved crystallization, rheological, and mechanical properties, demonstrating promising potential for industrial applications.
Sheng Linjie,Cheng Hongda,Li Yi et al. Preparation and Properties of Asymmetric Stereocomplex Poly(Lactic Acid)/Cotton Fiber Bio-based Composites[J]. Chemical Reaction Engineering and Technology, 2026, 42(4): 352-359.
