Preparation and Nonisothermal Crystallization Behavior Study of PET/PTT/MMT Nanocomposites

Poly(ethylene terephthalate)(PET)/poly(trimethylene terephthalate) (PTT) and PET/PTT/montmorillonite(MMT) nanocomposites were prepared by melt blending through a co-rotating twin screw extruder. Their morphology was characterized by Scanning Electron Microscope(SEM). And the nonisothermal crystallization behavior was studied by Differential Scanning Calorimetry(DSC). The results indicated that MMT dispersed homogeneously in the PTT matrix; the crystallization onset temperature(T-onset) and the crystallization peak temperature(T-p) in crystallization exotherms of PET/PTT/MMT nanocomposites shifted to higher temperature as MMT content increased, which proved MMT acted as heterogeneous nucleating agent, and the crystallization behavior became imperfect as the cooling rate increased.