Different component ratio of polyamide 1212/thermoplastic polyurethane blends: Effect on phase morphology, mechanical properties, wear resistance, and crystallization behavior

In this work, blends of polyamide 1212 (PA1212) and thermoplastic polyurethane (TPU) elastomer of different group distribution ratios were prepared by melt blending. The effects of different TPU additional ratios on static and dynamic mechanical properties, crystallization, and wear resistance were investigated. Scanning electron microscopy images show that the phase morphology of the blended alloy changes from an island structure to a co-continuous phase structure and then to a sea-island structure. Mechanical tests show that as the proportion of TPU in the blend increases, the flexural modulus increases, and the tensile strength and notched impact strength decrease first and then increase. Dynamic mechanical analysis shows an increase in the storage modulus (G ') and a broadening of the loss factor peak. In addition, with the increase of TPU content, the crystallinity of PA1212 in the system decreased slightly first, and the crystallinity of PA1212 increased remarkably after the TPU content was further increased to 80 wt%.