Effects of surface modification,carbon nanofiber concentration,and dispersion time on the mechanical properties of carbon‐nanofiber–polycarbonate composites |
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| Authors: | Yong Gao Peng He Jie Lian Mark J. Schulz Jiang Zhao Wei Wang Xiaqin Wang Jing Zhang Xingping Zhou Donglu Shi |
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| Affiliation: | 1. Department of Chemical and Materials Engineering, University of Cincinnati, Cincinnati, Ohio 45221;2. Department of Nuclear Engineering and Radiological Science, University of Michigan, Ann Arbor, Michigan 48109;3. Department of Mechanical Engineering, University of Cincinnati, Cincinnati, Ohio 45221;4. College of Material Science and Engineering, Donghua University, Shanghai 200051, People's Republic of China;5. College of Science, Donghua University, Shanghai 201620, People's Republic of China;6. Institute of Biological Sciences and Biotechnology, Donghua University, North Renmin Road 2999, Shanghai 201620, People's Republic of China |
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| Abstract: | The time effect of ultrasonication was investigated for dispersing carbon nanofibers (CNFs) into a polycarbonate (PC) matrix on the mechanical properties of thus‐produced composites. The effects of CNF surface modification by plasma treatment and the CNF concentration in composites on their mechanical properties were also explored. The plasma coating was characterized by HRTEM and FT‐IR. Furthermore, the plasma polymerization (10 w) treatment on the CNF enhanced the CNF dispersion in the polymer matrix. The mechanical properties of the CNF–PC composites varied with the dispersion time, at first increasing to a maximum value and then dropping down. After a long ultrasonic treatment (24 h), the properties increased again. At a high concentration, the CNF‐PC suspension became difficult to disperse. Additionally, the possible mechanisms for these behaviors are simply proposed. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3792–3797, 2007 |
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| Keywords: | composites carbon nanofiber (CNF) dispersion mechanical properties polycarbonates |
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