A novel polymer composite with double positive-temperature-coefficient transitions: effect of filler-matrix interface on the resistivity-temperature behavior

作者：Zhang Xiangwu^*; Pan Yi

来源：Polymer International, 2008, 57(5): 770-777.

DOI：10.1002/pi.2408

• positive temperature coefficient
• alloy
• polyethylene
• composite
• surface treatment
• interface

BACKGROUND: Sn-Pb alloy-filled high-density polyethylene (HDPE) composites exhibit double positive-temperature-coefficient (PTC) behavior, with the first transition at the melting point of HDPE and the second at that of Sn-Pb alloy. The objective of this study is to improve the reversibility and reproducibility of double-PTC transitions of these composite materials by enhancing the filler-matrix interface.
RESULTS: Fourier transform infrared spectroscopy, surface wettability and dynamic mechanical and rheological measurements confirm that surface-treating Sn-Pb with titanate concentration <= 1 wt% enhances the interface adhesion between Sn-Pb alloy and HDPE matrix. Surface-treating Sn-Pb with titanate concentration <= 1 wt% increases the PTC transition temperature, reduces the PTC intensity and improves the reversibility and reproducibility of the double-PTC behavior of Sn-Pb/HDPE composites.
CONCLUSION: It is demonstrated that adjusting the filler-matrix interface is an effective means to modify the double-PTC behavior of Sn-Pb alloy-filled HDPE composites.

• 出版日期2008-5
• 单位浙江大学