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Zhang D.,Guizhou UniversityGuiyang550025 China | He M.,Guizhou UniversityGuiyang550025 China | Qin S.,Guizhou UniversityGuiyang550025 China | Yu J.,Guizhou UniversityGuiyang550025 China | And 2 more authors.
Polymer Composites | Year: 2016

Long glass fiber reinforced thermoplastic polyurethane and Poly (butylene terephthalate) (PBT) (LGFTP) composites with different ratios of TPU and PBT were prepared by using self-designed impregnation device. The dynamic mechanical, thermal, and mechanical properties of LGFTP composites were studied. Results showed that there was good compatibility between TPU and PBT. Dynamic mechanical thermal analysis (DMA) results indicated that the TPU content and scanning frequencies had some influence on dynamic mechanical properties and glass transition of LGFTP composites. In addition, the Arrhenius relationship has been used to calculate the activation energy of α-transition of the composites. Differential scanning calorimetry (DSC) analysis indicated that with increasing TPU content the crystallization temperature (Tc), the melting point (Tm), and the percent crystallinity (Xc) decreased. Both TG and DTG curves of the LGFTP composites are shifted to lower temperatures with the increasing of TPU content. Mechanical properties showed that the addition of TPU could lead to a remarkable increase tensile and notched izod impact strength with a small reduction in flexural strength and modulus of LGFTP composites. © 2016 Society of Plastics Engineers. Source


Zhang D.,Guizhou UniversityGuiyang550025 China | He M.,Guizhou UniversityGuiyang550025 China | Qin S.,Guizhou UniversityGuiyang550025 China | Yu J.,Guizhou UniversityGuiyang550025 China
Polymer Composites | Year: 2016

Long glass fibers reinforced thermoplastic polyurethane and poly (butylene terephthalate) with the compatibilizer of poly (ethylene-butylacrylate-glycidyl methacrylate copolymer) (LGF/TPU/PBT/PTW) composites were prepared by using self-designed impregnation device. Various rheological plots including viscosity curve, storage modulus, loss modulus, loss angle, Cole-Cole plot, and relaxation spectrum were used to characterization of rheological properties. Dynamic mechanical thermal analysis (DMA) results indicated that "double tanδbehavior" of composites is observed. The activation energies of α and β-relaxation process of loss modulus and tan δ of the LGF/TPU/PBT/PTW composites gradually increased with long glass fibers content. Moreover, activation energies for the glass transition relaxation determined from loss tangent peaks are more reliable than using loss modulus criterion. Thermal properties of composites are studied by differential scanning calorimetry (DSC) and thermogravimetric analyses (TGA). Mechanical properties of composites are studied. © 2016 Society of Plastics Engineers. Source

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