High Melt Strength and High Toughness PLLA/PBS Blends by Copolymerization and in Situ Reactive Compatibilization

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• 作者：Bao ZhangBin Sun ; Xinchao Bian ; Gao Li ; Xuesi Chen
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2017
• 出版时间：January 11, 2017
• 年：2017
• 卷：56
• 期：1
• 页码：52-62
• 全文大小：603K
• ISSN：1520-5045

文摘

Poly(l-lactide)/poly(butylene succinate) (PLLA/PBS) blends were prepared by melt mixing with a PLLA-based compatibilizer (PBS-PLLA) and a chain extender triarm block copolymer (PLLA-block-poly(glycidyl methacrylates))₃ (PLLA-b-PGMA)₃. The tensile testing showed significant improvement in mechanical properties and remarkably maintained high strength. Rheological investigation of PLLA/PBS/PBS-PLLA/(PLLA-b-PGMA)₃ indicated that the viscosity and storage modulus was improved greatly compared with neat PLLA. Elongational viscosity measurements exhibited strong strain-hardening behavior. The increase of the torque indicated the occurrence of chain branching and chain extension reaction. The imperfect crystallization of PLLA/PBS/PBS-PLLA/(PLLA-b-PGMA)₃ blends was demonstrated by the lowered melt point of PLLA. SEM showed that the PBS-PLLA and (PLLA-b-PGMA)₃ significantly improved the compatibility of the PLLA/PBS blends. It was indicated that the synergistic effects of PBS-PLLA and (PLLA-b-PGMA)₃ in PLLA/PBS blends played a key role in properties enhancement. With copolymerization and in situ reactive compatibilization, PLLA/PBS/PBS-PLLA/(PLLA-b-PGMA)₃ blends not only improved the toughness but also improved the melt strength.