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Effect of Biaxial Stretching on Thermal Properties, Shrinkage and Mechanical Properties of Poly (Lactic Acid) Films

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Abstract

This study produced poly (lactic acid) sheets using a biaxial stretching process, to investigate the effects of biaxial stretching on thermal properties, crystallinity, shrinkage and mechanical properties of PLA films. The results of differential scanning calorimetry show that the glass temperature peak of PLA films, which weakened after stretching. The cold crystallization peak of PLA films nearly disappeared at stretch ratios of 4 × 4 with a stretching rate above 50 %/s. The orientation and strain crystallization of PLA films were suppressed at stretching temperatures of approximately 100–110 °C. The shrinkage of PLA decreased proportionally to the stretch rate and inversely proportional to the stretching temperature, suggesting that the internal stresses frozen in the amorphous phase were an indication of a decrease in the crystallinity of the films, implying that PLA films would be best suited to low-shrinkage applications. The stress–strain of the PLA films increased considerably following the biaxial stretching process. In addition, PLA films exposed to hot water treatment show a slight decrease in stress values, probably attributable to a relaxation of the molecules, which have undergone orientation but failed to crystallize.

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Authors and Affiliations

  1. Material Application Center, Industrial Technology Research Institute, Tainan City, Taiwan

    Jyh-Horng Wu, Chien-Pang Wu & Chia-Hao Li

  2. Department of Materials Engineering, Kun Shan University, No. 949, Da-Wan Rd., Yong-Kang Dist., Tainan City, 71003, Taiwan, ROC

    Ming-Shien Yen & M. C. Kuo

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  1. Jyh-Horng Wu
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  2. Ming-Shien Yen
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  3. Chien-Pang Wu
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  4. Chia-Hao Li
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  5. M. C. Kuo
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Correspondence to M. C. Kuo.

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Wu, JH., Yen, MS., Wu, CP. et al. Effect of Biaxial Stretching on Thermal Properties, Shrinkage and Mechanical Properties of Poly (Lactic Acid) Films. J Polym Environ 21, 303–311 (2013). https://doi.org/10.1007/s10924-012-0523-5

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  • DOI: https://doi.org/10.1007/s10924-012-0523-5

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