Preparation and structure of highly confined intercalated polystyrene/montmorillonite nanocomposite via a two-step method |
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Authors: | Chao Ding Hui He Demin Jia Haoqun Hong |
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Institution: | Department of Polymer Materials and Engineering, South China University of Technology, Guangzhou 510640, China |
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Abstract: | A two-step approach with a combination of emulsion polymerization and melt intercalation with higher clay loading of 33 wt.% is disclosed to highly confine the polystyrene (PS) chains by montmorillonite. The product of the emulsion polymerization is an easily crushable fine powder. And the powder is readily processible by open mill to form a transparent sheet. In the melt intercalation process, further intercalation of polystyrene narrows the space among the tactoids and results a highly confined intercalated nanocomposite. The results of dynamic mechanical thermal analysis (DMTA) and differential scanning calorimetry (DSC) showed that the cooperative motions of PS segments were substantially depressed, indicative of the highly intercalated structure formed in the nanocomposites. A structural model is proposed to explain the highly confined mesostruture of the PS/MMT nanocomposite. |
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Keywords: | Polystyrene Montmorillonite Nanocomposite Confinement |
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