Cryogenic Dielectric and Mechanical Properties of Nanowire-A1203 Filled PBT/GF Composites

• Published in: 2006 1st IEEE International Conference on Nano/Micro Engineered and Molecular Systems pp. 291 - 294
• Main Authors: Demei Yu, Yunchuan Xie, Weitao Wan, Xiusheng Guo, Yingxin Xi, Zhantong Mao, Longbiao Huang
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.01.2006
• Subjects: composites; cryogenic; Cryogenics; Crystallization; Dielectric losses; dielectric properties; Glass; Mechanical factors; meheanical propeties; Microstructure; Nanoparticles; Optical fiber testing; Surface cracks; Temperature
• ISBN: 1424401399; 9781424401390
• DOI: 10.1109/NEMS.2006.334725

The cryogenic dielectric and mechanical properties of nanowire-Al 2 O 3 filled PBT/GF (glass fiber) composites are investigated by combing macro-performances testing and microstructures analysis. Compared with PBT/GF composites, the PBT/GF/Al 2 O 3 ternary systems present improved tensile strength as well as impact strength. The fracture surface shows a typical toughened characteristic under SEM observation, which may be explained by the "crack bridging" toughening mechanism. At the same time, POM study indicates diminished spherulitic texture for the three phase composites, which is due to nucleating effect of the nanoparticles. DSC and WAXD analysis suggest that nanowire-Al 2 O 3 can hinder the crystal growth and lower the degree of crystallinity. Cryogenic dielectric spectra of the composites showed a broad gamma loss process shifting to low temperature region with the increasing content of Al 2 O 3 , which suggested that the existence of the nanowire might facilitate the molecular motions of PBT matrix and improved the low temperature toughness. Suitable amount of Al 2 O 3 can also be helpful to reduce the micro-defects, which may contribute to the higher electrical strength of the systems