Yamaguchi Masayuki, Nakamura Kodai, Kimura Takeyoshi, Moonprasith Nantina, Kida Takumitsu, Tsubouchi Kyoko, Narita Takaaki, Hiraoka Tatsuhiro
Japan Advanced Institute of Science and Technology, School of Materials Science, 1-1 Asahidai, Nomi 923-1292, Ishikawa, Japan.
Sirindhorn International Institute of Technology, Thammasat University, 99 Moo 18, Paholyothin, Khlong Luang, Pathum Thani 12120, Thailand.
Materials (Basel). 2022 Apr 10;15(8):2783. doi: 10.3390/ma15082783.
The effects of pressure and shear rate on the miscibility of binary blends comprising bisphenol-A polycarbonate (PC) and low molecular weight poly(methyl methacrylate) (PMMA) were investigated using a capillary rheometer. Both pressure and shear rate affected the miscibility. The examination of an extruded strand of the blend provided information about the cause of the phase change. Under high pressure, pressure-induced demixing occurred at temperatures below the lower critical solution temperature (LCST) of the blend. Consequently, the extruded strand became opaque throughout. During shear-induced mixing/demixing, a part of the strand became opaque because of the distribution of the shear rate in the strand. For example, during shear-induced demixing, only the exterior of the strand, i.e., the high shear rate region, became opaque. Above the LCST, shear-induced mixing occurred, and only the center region of the strand became opaque.
使用毛细管流变仪研究了压力和剪切速率对由双酚 A 聚碳酸酯（PC）和低分子量聚甲基丙烯酸甲酯（PMMA）组成的二元共混物的混溶性的影响。压力和剪切速率均影响混溶性。对共混物挤出条的检查提供了有关相变原因的信息。在高压下，在低于共混物的下临界溶液温度（LCST）的温度下发生压力诱导的相分离。因此，挤出条整体变得不透明。在剪切诱导的混合/相分离过程中，由于条中剪切速率的分布，条的一部分变得不透明。例如，在剪切诱导的相分离过程中，只有条的外部，即高剪切速率区域，变得不透明。在 LCST 以上，发生剪切诱导的混合，并且只有条的中心区域变得不透明。
