Study on dynamic mechanical, thermal, and mechanical properties of long glass fiber reinforced thermoplastic polyurethane/poly(butylene terephthalate) composites

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 ( T c ), the melting point ( T m ), and the percent crystallinity ( X c ) 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. POLYM. COMPOS., 39:63–72, 2018. © 2016 Society of Plastics Engineers