Preparation and properties of PU/MCMMT nanocomposites |
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| Authors: | Min Qiao Shishan Wu Qianping Ran Jian Shen |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China;2. Jiangsu Institute of Building Science Co. LTD, Nanjing 210008, P. R. China;3. College of Chemistry and Environment Science, Nanjing Normal University, Nanjing 210097, P. R. China |
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| Abstract: | The cetyltrimethyl ammonium bromide (CTAB) was used as a swelling agent to be intercalated into the galleries of the montmorillonite (MMT) platelets to get the organic MMT (CMMT). Then 4,4′‐diphenylmethane diisocyanate (MDI) were grafted on CMMT by the reaction between hydroxyls in organic MMT platelets and MDI to synthesize the MDI modified CMMT (MCMMT). Polyurethane (PU)/MCMMT composites were prepared by situ polymerization. The MCMMT platelets dispersed in a PU matrix in nanometer scale. The dispersion and intercalation degree of the MCMMT platelets decreased with increase in the content of MCMMT. Under the same content of fillers, the tensile strength and tear strength of PU/MCMMT nanocomposites were higher than those of PU/organic MMT nanocomposites. The reinforcing effect of the MCMMT platelets to the PU was better than that of the organic MMT platelets. With increase in the content of MCMMT, the tensile strength and tear strength of the PU/MCMMT nanocomposites were increased, while the extent of the increase slowed down. Compared with those of PU, the thermal stability of PU/MCMMT nanocomposites was increased. Copyright © 2009 John Wiley & Sons, Ltd. |
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| Keywords: | montmorillonite MDI polyurethane nanocomposites |
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