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An NMR and DSC-investigation of the poly(vinyl chloride)-dioctylphthalate system
Affiliation:1. The School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, Australia;2. Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bangalore, Karnataka, India;3. Department of Basic Sciences, School of Engineering and Technology, Jain University, Bangalore, Karnataka, India;4. Department of Materials Science & Nanotechnology, Yogi Vemana University, Kadapa, Andhra Pradesh, India;1. Polymer Science Department, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, 14967, Iran;2. Department of Polymerization Engineering, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, 14967, Iran;1. Tulane University School of Medicine, New Orleans;2. Wayne State University, Detroit;3. Boston Children’s Hospital and Harvard University, Cambridge, MA;4. University of Washington, Seattle;5. University of Maryland, College Park;6. Boston Children’s Hospital/Harvard University and Harvard Graduate School of Education, Cambridge;1. Spectroscopy Department, Physics Division, National Research Center, Giza, Egypt;2. Physic Department, Faculty of Science, Taibah University, Al-Ula, Saudia Arabia;3. Physic Department, Faculty of Science, Amran University, Sa''dah, Yemen;4. Physics Department, Faculty of science, Mansoura University, Mansoura, Egypt;1. School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Zhongguancun South Street, Beijing, 100081, China;2. School of Materials and Environment, Beijing Institute of Technology, Zhuhai, 519085, China;3. School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, 100191, China
Abstract:
It has been demonstrated that the system poly(vinyl chloride)-dioctylphthalate (PVC-DOP) gives rise to distinct component lines in the wide-line NMR spectrum. These lines correspond to very different degrees of segmental mobility of the material within a large interval of temperatures. We consider that these component lines correspond to at least two PVC-phases of the samples since no established phase separation occurs and since the narrow line registered at higher temperatures vanishes at room temperature. DOP itself exhibits a very narrow line at room temperature. The DSC-results indicate a variety of phases since the transition region occurs over a wider temperature interval when the amount of DOP increases. The Tg of PVC also decreases nearly lineary with the DOP-content. This result indicates an inhomogeneous structure of the system.
Keywords:
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