期刊
COMPOSITES PART B-ENGINEERING
卷 143, 期 -, 页码 161-167出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2018.01.022
关键词
Polymer nanocomposites; Microcellular foams; Carbon nanotubes; Electrical conductivity; Impact strength
资金
- National Natural Science Foundation of China [51673015, 51373011, 51533001]
- Fundamental Research Funds for the Central Universities [BHYC1707B]
- National Key Research and Development Program of China [2016YFC0801302]
Electrically conductive polycarbonate/polystyrene/carbon nanotube (PC/PS/CNT) ternary nanocomposites are prepared by blending with styrene-maleic anhydride copolymer as their compatibilizer. Interestingly, CNTs are selectively distributed in PC phase in the PC/PS/CNT nanocomposites. After foaming with supercritical carbon dioxide as the foaming agent, most cells preferentially localize in the readily foamed PS phase; whereas, few cells appear in the PC matrix. Therefore, a selectively foamed morphology consisting of electrically conductive PC/ CNT continuous phase and the foamed PS dispersed phase is well constructed. Due to the selective localization of CNTs, the PC70/PS30/CNT nanocomposite foams with PC as the matrix exhibits a much lower conducting percolation threshold of 0.35 vol% than the PC30/PS70/CNT nanocomposite foams with foamed PS as the matrix (0.94 vol%). The high electrical properties of the PC70/PS30/CNT foams are attributed to the conducting network of CNTs within the continuous PC matrix and the volume-exclusion effect of the preferentially foamed PS dispersed phase. More interestingly, PC70/PS30/1%CNT nanocomposite foam also exhibits much higher mechanical properties than PC30/PS70/1%CNT nanocomposite foam and a significant increase of 245% in notched Izod impact strength is achieved in relative to its bulk counterpart due to the toughening effect of the foamed PS particles.
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