Preparation of poly(vinyl acetate)/clay and poly(vinyl acetate)/poly(vinyl alcohol)/clay microspheres |
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Authors: | Hye Min Jung Eun Mi Lee Byung Chul Ji Sung Ok Sohn Han Do Ghim Hyunju Cho Young A Han Jin Hyun Choi Jae Deuk Yun Jeong Hyun Yeum |
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Institution: | 1. Department of Textile System Engineering, Kyungpook National University, 702-701, Daegu, Korea 2. Department of Home Economics Education, Kyungpook National University, 702-701, Daegu, Korea 3. Department of Obstetrics and Gynecology, Cornell Medical University, 10021, NY, USA 4. Department of Natural Fiber Science, Kyungpook National University, 702-701, Daegu, Korea
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Abstract: | Poly(vinyl acetate) (PVAc)/poly(vinyl alcohol)(PVA)/montmorillonite (MMT) clay nanocomposite microspheres with a core/shell
structure have been developed via a suspension polymerization approach. In order to prepare the PVAc/MMT and PVAc/PVA/MMT
nanocomposite microspheres, which are promising precursor of PVA/MMT nanocomposite microspheres, suspension polymerization
of vinyl acetate with organophilic MMT and heterogeneous saponification were conducted. A quaternary ammonium salt, cetyltrimethylammonium
bromide, was mixed with the MMT in the monomer phase prior to the suspension polymerization. The rate of conversion decreased
with an increase in MMT concentration. The incorporation of MMT into the PVAc was verified by FT-IR spectroscopy. Organic
vinyl acetate monomers were intercalated into the interlayer regions of organophilic clay hosts and followed by suspension
polymerization. Partially saponified PVA/MMT nanocomposite microspheres with a core/shell structure were successfully prepared
by heterogeneous saponification. |
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