Orientation and structural development of semicrystalline poly(lactic acid) under uniaxial drawing assessed by infrared spectroscopy and X-ray diffraction |
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| Affiliation: | 1. National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Advanced Materials Processing & Mold, Ministry of Education, Zhengzhou University, Zhengzhou 450002, China;2. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China;1. Unité Matériaux et Transformations, UMR CNRS 8207, Université Lille1, Bat. C6, 59655 Villeneuve d''Ascq, France;2. Université de Lyon, Laboratoire MATEIS, INSA de Lyon-CNRS-UMR5510, Bâtiment Blaise Pascal, Campus de la Doua, 69621 Villeurbanne, France;1. Division of Materials Science, Luleå University of Technology, SE-971 87, Luleå, Sweden;2. Fibre and Particle Engineering, University of Oulu, FI-91400, Oulu, Finland;1. College of Polymer Science and Engineering and State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China;2. Institute of Printing and Packaging Engineering, Xi׳an University of Technology, Xi׳an, Shanxi 710048, PR China;3. Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA;1. National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Advanced Materials Processing & Mold (Ministry of Education), Zhengzhou University, Zhengzhou 450002, China;2. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China;1. Hubei Provincial Key Laboratory of Green Materials for Light Industry, Collaborative Innovation Center for Green Light-weight Materials and Processing, School of Materials Science and Engineering, Hubei University of Technology, Wuhan, Hubei Province 430068, PR China;2. Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, PR China;3. Key Laboratory for Large-Format Battery Materials and System of National Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei Province 430074, PR China |
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| Abstract: | The effects of drawing temperature (Td) and draw strain on the orientation and structure of semicrystalline poly(lactic acid) (PLA) films were investigated by wide angle X-ray diffraction and polarized Fourier transform infrared spectroscopy. Semicrystalline PLA samples with two initial levels of crystallinity, Xc = 1% and 11%, were prepared by cold crystallization at 80 °C. Whatever Xc and Td, the total amount of the ordered phases (i.e. crystalline + mesophase) increased with draw strain, which could be ascribed to the formation of strain-induced mesophase at Td = 60 or 70 °C but crystalline at 80 °C. Also, the molecular orientation of both the amorphous and ordered phases increased with draw strain. Whatever Xc, the orientation of the ordered phases was insensitive to Td, whereas higher orientation in the amorphous phase was achieved at lower Td, and the trend was more significant for Xc = 1% compared with 11%. |
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| Keywords: | Poly(lactic acid) Uniaxial drawing Orientation |
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