Preparation of Nano-cellular PMMA Foam: Effect of Micelle Size on Foaming Behavior
ZHENG Xiaoping1, WANG Fan1, WU Zhiang1, GONG Liwen1, BAO Jinbiao1, WANG Shiwei2
1 Department of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211; 2 National Center for International Research of Micro-nano Molding Technology & Key Laboratory for Micro Molding Technology of Henan Province, Zhengzhou University, Zhengzhou 450001
Abstract: In this work, we systematically investigated the foaming behavior of polymethyl methacrylate nano-cellular foams during the process of supercritical CO2 assisted solid-state foaming with varied blends micelle sizes which was tailored by adding the dual block copolymer of polystyrene-PMMA. According to the "self-assembly" of block copolymer, specimens with various micelle sizes were prepared by controlling the block ratio, and characterized by TEM. The results revealed that micelle size of the polymer blends increases with increasing block ratio. Furthermore, the cell morphologies of the resultant polymer foams was determined by SEM analysis, and confirmed the significant influence of micelle size on foaming behavior. It should be noted that the small size of micelle leads to poor cell distribution. When micelle size and cell size are at the same order of magnitude, the uniform cell morphology can be obtained. In addition, nano-cellular foams for high expansion and uniform cell distribution can be achieved due to the increase of micelle number.
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2019, Vol. 33 
