Abstract
Tin fluoride phosphate glass (TFP‐glass) has been found to improve the rheological properties and modulus of polar polymer, but the mechanism involved is still unrevealed. In this work, a kind of poly (ethylene terephthalate) (PET)/TFP‐glass composites with low viscosity and high modulus were prepared by melt blending. In order to explore the enhancement mechanism of flowability and modulus, we investigated the structure change of PET before and after blending, the viscosity evolution of TFP‐glass during heating and the final phase morphology of PET/TFP‐glass composites. Based on intrinsic viscosity and rheological measurements, the improvement of the flowability was attributed to the decrease of molecular weight of PET and the macromolecular plasticizer effect of TFP‐glass. Non‐isothermal crystallization behaviors of the composites indicated that the crystallization properties of PET were improved due to heterogeneous nucleation effect of the TFP‐glass and the decreased molecular weight of PET. The improved crystallization of PET as well as strong interfacial interaction between PET and TFP‐glass contribute to a significant enhancement in the modulus of composites, as compared with pure PET. POLYM. COMPOS., 40:2555–2563, 2019. © 2018 Society of Plastics Engineers
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