科研之友
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摘要
The polyurethane (PU)montmorillonite (MMT) composite prepared by in situ polymerization was a sort of intercalated nanocomposite. The silicate platelets were dispersed in the PU matrix on the nanoscale. The N,N-dimethylformamide (DMF) suspension containing the PU/MMT nanocomposite was stable for a long time, and the silicate platelets did not subside. With an increasing content of silicate, the tensile and tear strength of the PU/MMT nanocomposite increased, but the rate of increase diminished. Compared with that of pure PU, the temperature of initial weight loss of the PU/MMT nanocomposite in the first step decreased because of the acid catalytic action of the protonated silicate platelets, but the temperature of initial weight loss in the second step increased due to the barrier effect of the silicate platelets and the strong interfacial interaction between silicate platelets and the molecular chains of PU.
