Mechanical Properties, Crystallization and Biodegradation Behavior of the Polylactide/Poly(3-hydroxybutyrate- co -4-hydr
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ARTICLE
POLYMER SCIENCE
https://doi.org/10.1007/s10118-020-2418-6 Chinese J. Polym. Sci.
Mechanical Properties, Crystallization and Biodegradation Behavior of the Polylactide/Poly(3-hydroxybutyrate-co-4-hydroxybutyrate)/ Poly(butylene adipate-co-terephthalate) Blown Films Xiang-Yu Wanga,b, Hong-Wei Pana, Shi-Ling Jiaa, Zeng-Wen Caoa,b, Li-Jing Hana*, Hui-Liang Zhanga,b,c, and Li-Song Donga,b a Key Laboratory of Polymer Ecomaterials, Chinese Academy of Sciences, Changchun Institute of Applied Chemistry, Changchun 130022, China b University of Science and Technology of China, Hefei 230026, China c Zhejiang Zhongke Applied Chemistry Technology Co., Ltd., Hangzhou 310000, China
Abstract Polylactide (PLA), poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P(3HB-co-4HB)), and poly(butylene adipate-co-terephthalate) (PBAT) ternary blends were prepared by extrusion blending. The biodegradable PLA/P(3HB-co-4HB)/PBAT films were successfully obtained by using blown films technique. Excellent stiffness-toughness balance was achieved for 55/10/35 PLA/P(3HB-co-4HB)/PBAT film. The tensile strength reached 33.0 MPa (MD) and 23.5 MPa (TD), the elongation at break exceeded 130 %, and tear strength exceeded 110 kN/m. The Young′s modulus as low as about 1800 MPa also met packaging applications. SEM observations revealed rough and long ligaments, indicating that the tear specimens were broken yieldingly. The addition of PBAT elastomers was the main reason for the improved toughness of the film. From DMA and SEM analysis, it was demonstrated that PLA, P(3HB-co-4HB), and PBAT were partially compatible. With increasing P(3HB-co-4HB) content, the melt and cold crystallization of PLA was promoted. The enzymatic degradation experiments indicated that the films had good biodegradability. These findings gave important implications for designing and manufacturing biodegradation package of high biological carbon content. Keywords Polylactide; Poly(3-hydroxybutyrate-co-4-hydroxybutyrate); Blown films; Mechanical properties; Biodegradability Citation: Wang, X. Y.; Pan, H. W.; Jia, S. L.; Cao, Z. W.; Han, L. J.; Zhang, H. L.; Dong, L. S. Mechanical properties, crystallization and biodegradation behavior of the polylactide/poly(3-hydroxybutyrate-co-4-hydroxybutyrate)/poly(butylene adipate-co-terephthalate) blown films. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-020-2418-6
INTRODUCTION Biodegradable aliphatic polyesters are getting more and more attractive due to their large application prospects in the field of packaging and single-use disposable items for their great biocompatible, biodegradable, and renewable characteristics. As one of the most prominent polymers, polylactide (PLA) has good biocompatibility, biodegradability, and high mechanical strength, and PLA films for packaging applications including food packaging, trashcan liners, shrink films, stretch films, and merchandise packaging are commonly made through a blown film process.[1−7] Unfortunately, compared to polyolefins, neat PLA is not well suited for the blowi
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