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Effect of inorganic phase on polymeric relaxation dynamics in PMMA/silica hybrids studied by dielectric analysis |
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| Authors: | Chaoxu Li Jun Zhao Qingrong Fan |
| Institution: | a State Key Laboratory of Polymer Physics & Chemistry, Joint Laboratory of Polymer Science & Materials, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, PR China b Laboratory of Engineering Plastics, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, PR China |
| Abstract: | Dielectric relaxation spectroscopy was used to investigate the effect of the inorganic phase on the polymeric relaxation dynamics in PMMA/silica hybrids synthesized in situ via sol-gel processes. It was found that the large-scale molecular motions of PMMA were influenced by the addition of silica, inducing longer mean relaxation times, more heterogeneous relaxing environments and the higher activation energy. Explanations based on hydrogen-bond interactions between two phases and a fraction of entrapped chain segments in silica networks were proposed to understand the influence of the silica. |
| Keywords: | Dielectric relaxation spectroscopy (DRS) Polymeric relaxation dynamics Hybrid Poly(methyl methacrylate) (PMMA) |
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