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Synthesis and characterization of polyurethane/montmorillonite nanocomposites by in situ polymerization
Author(s) -
Ding Qingjun,
Liu Baolei,
Zhang Qiang,
He Qihui,
Hu Baixing,
Shen Jian
Publication year - 2006
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1990
Subject(s) - montmorillonite , polyurethane , nanocomposite , materials science , glass transition , dynamic mechanical analysis , in situ polymerization , polymerization , thermal stability , composite material , ultimate tensile strength , transmission electron microscopy , polymer chemistry , chemical engineering , polymer , nanotechnology , engineering
In this paper, a new type of organophilic montmorillonite, co‐treated with cetyltrimethyl ammonium bromide (CTAB) and 4,4′‐diphenymethylate diisocyanate (MDI), was modified and applied to prepare polyurethane/montmorillonite nanocomposites via in situ polymerization. The nanoscale montmorillonite layers were exfoliated and dispersed relatively homogeneously in the polyurethane matrix, and characterized by X‐ray diffraction and transmission electron microscopy. The thermal degradation temperature of the nanocomposites increased, as compared with pristine polyurethane. Dynamic mechanical analysis confirmed the constraining effect of exfoliated montmorillonite layers on polyurethane chains, which benefited the increased storage modulus and increased glass transition temperature. Tensile tests showed that the exfoliated nanocomposites were reinforced and toughened by the addition of nanometer‐size montmorillonite layers. Copyright © 2006 Society of Chemical Industry