Abstract
Poly(ethylene terephathalate)/1,2-propanediolisobutyl polyhedral oligomeric silsesquioxane (POSS) composites were prepared by in situ polymerization with 1.5-5.0 wt% loading of POSS. The dispersion of POSS in PET matrix was investigated by scanning electron microscope(SEM) the interaction between POSS and PET chains was studied by nuclear magnetic resonance(NMR) andX-ray photoelectron spectroscopy(XPS), and the thermal behavior of PET/POSS composites was investigated by DSC and TG as well as the melt rheological testing of PET/POSS. SEM observation suggests that POSS particles disperse evenly innanosize(80-100nm)in PET matrix, and this fine dispersion of POSS was further supported by XPS analysis, there is a covalent linkage presenting between POSS and PET chains. The crystallization temperature of the composites moved to high temperature as the POSS particles behave as the nucleating agent. The shear modulus(G’) increased apparently with the addition of POSS.
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