Compatible and crystallization properties of poly(lactic acid)/poly(butylene adipate‐co‐terephthalate) blends |
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| Authors: | Jen‐Taut Yeh Chi‐Hui Tsou Chi‐Yuan Huang Kan‐Nan Chen Chin‐San Wu Wan‐Lan Chai |
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| Affiliation: | 1. Department and Graduate School of Polymer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan;2. Faculty of Chemistry and Material Science, Hubei University, Wuhan, China;3. Key Laboratory of Green Processing and Functional Textiles of New Textile Materials, Ministry of Education, Wuhan University of Science and Engineering, Wuhan, China;4. Department of Materials Engineering, Tatung University, Taipei, Taiwan;5. Department of Chemistry, Tamkang University, Tamsui, Taiwan;6. Department of Biochemical Engineering, Kao Yuan University, Kaohsiung, Taiwan;7. Department of Environmental Engineering, Vanung University, Tao‐Yuan, Taiwan |
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| Abstract: | Differential scanning calorimetry (DSC), wide angle X‐ray diffraction (WAXD) and dynamic mechanical analysis (DMA) properties of poly(lactic acid)/ poly(butylene adipate‐co‐terephthalate) (PLA/PBAT) specimens suggest that only small amounts of poor PLA and/or PBAT crystals are present in their corresponding melt crystallized specimens. In fact, the percentage crystallinity, peak melting temperature and onset re‐crystallization temperature values of PLA/PBAT specimens reduce gradually as their PBAT contents increase. However, the glass transition temperatures of PLA molecules found by DSC and DMA analysis reduce to the minimum value as the PBAT contents of PLAxPBATy specimens reach 2.5 wt %. Further morphological and DMA analysis of PLA/PBAT specimens reveal that PBAT molecules are miscible with PLA molecules at PBAT contents equal to or less than 2.5 wt %, since no distinguished phase‐separated PBAT droplets and tan δ transitions were found on fracture surfaces and tan δ curves of PLA/PBAT specimens, respectively. In contrast to PLA, the PBAT specimen exhibits highly deformable properties. After blending proper amounts of PBAT in PLA, the inherent brittle deformation behavior of PLA was successfully improved. Possible reasons accounting for these interesting crystallization, compatible and tensile properties of PLA/PBAT specimens are proposed. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 |
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| Keywords: | poly(lactic acid) poly(butylene adipate‐co‐terephthalate) compatability crystallization blend |
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