Rheology characterization, dynamic mechanical, thermal, and mechanical properties of LGF/TPU/PBT/PTW composites

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 tan δ behavior” 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. POLYM. COMPOS., 39:794–806, 2018. © 2016 Society of Plastics Engineers