Segregation Behavior of Miscible PC/PMMA Blends during Injection Molding |
| |
| Authors: | Nantina Moonprasith Jitsuhiro Date Takumi Sako Takumitsu Kida Tatsuhiro Hiraoka Masayuki Yamaguchi |
| |
| Affiliation: | 1.School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi 923-1292, Japan; (N.M.); (J.D.); (T.S.); (T.K.);2.Sirindhorn International Institute of Technology, Thammasat University, 99 Moo 18, Paholyothin, Khlong Luang 12120, Thailand;3.Hiroshima R&D Center, Mitsubishi Chemical Corporation, 20-1, Miyukicho, Otake, Hiroshima 739-0693, Japan; |
| |
| Abstract: | Miscible blends composed of bisphenol-A polycarbonate (PC) and poly(methyl methacrylate) (PMMA), in which one of them has low molecular weight, were employed to study the surface segregation behavior during flow. The blend samples showed typical rheological behaviors, such as simple polymer melts without a long-time relaxation mechanism ascribed to phase separation, demonstrating that they were miscible. After injection molding, the amounts of a low molecular weight component on the blend surface were found to be larger than the actual blend ratio. Because the injection-molded products were transparent despite a huge difference in refractive indices between PC and PMMA, they showed no phase separation. This result demonstrated that surface segregation of a low molecular weight component occurred under flow field, which expands the material design such as tough plastics with good scratch resistance and optical fibers with tapered refractive index. |
| |
| Keywords: | polymer blends viscoelastic properties injection molding segregation polycarbonate poly(methyl methacrylate) |
|
|
