Abstract
A two-step approach was employed to prepare Poly(p-dioxanone)-PU/organic montmorillonite (PPDO-PU/OMMT) nanocomposites. In the first step, PPDO diol prepolymers with different molecular weights were synthesized by ring-opening polymerization of p-dioxanone; in the second step, PPDO-PU/OMMT nanocomposites were prepared by coupling PPDO diol melt swollen with organo-modified MMT (OMMT), using 1,6-hexamethylene diisocyanate (HDI) as the chain-extender. The intercalated-exfoliated coexistence morphology of nanocomposites was determined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Thermogravimetric analysis (TG), high-pressure capillary rheometer, and mechanical test were performed to investigate the properties of the nanocomposites. The results showed that the thermal stability and mechanical performance of nanocomposites were greatly improved compared to that of pure PPDO. The enhancement of shear viscosity and low temperature sensitivity of the nanocomposite melts enabled it to produce thin films by blowing process successfully.
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