Grafting of telechelic poly(lactic‐co‐glycolic acid) onto O2 plasma‐treated polypropylene flakes |
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| Authors: | Jing Ren Xiaoqing Hua Tianzhu Zhang Zhigang Zhang Zhenling Ji Ning Gu |
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| Affiliation: | 1. Jiangsu Key Laboratory for Biomaterials and Devices, State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Sipailou 2, Nanjing 210096, China;2. Suzhou Key Lab of Biomedical Materials and Technology, Research Institute of Southeast University in Suzhou, Ren Ai Road 150, Suzhou Industrial Park, Suzhou 215123, China;3. Department of General Surgery, Zhong‐Da Hospital, Southeast University, Dingjiaqiao 87, Nanjing 210009, China |
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| Abstract: | An operating window, which is bounded by two temperatures and draw ratios, defines the stable and defect‐free stretching region of a polymer film. Physical properties including the coefficient of thermal expansion (CTE), birefringence, and Young's modulus of a recyclable polyimide (PIR) film were measured under stretching conditions. While values of birefringence and Young's modulus increased with increasing stretching stress in the machine direction, the CTE was found to decrease. A semiempirical model for the prediction of birefringence and Young's modulus under stretching conditions was developed, from which the CTE could be estimated from the Young's modulus data. Theoretically evaluated physical properties were found to be in qualitative agreement with the experimental data. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 |
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| Keywords: | polypropylene telechelic poly(lactic‐co‐glycolic acid) oxygen plasma grafting |
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