Relationships between Molecular Structure and Phase Behavior in Two-Component Blends of Acrylic and Styrenic Polymers

• Main Authors: Jang, Fan-Hwei, 詹芳惠
• Other Authors: Woo E.M.
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/00498655240936593723

碩士 === 國立成功大學 === 化學工程學系 === 86 === Abstract Miscibility and morphology in three binary blend systems: polystyrene (PS) with poly(cyclohexyl methacrylate) (PCHMA), poly(4-methylstyrene) (P4MS) with poly(cyclohexyl methacrylate) (PCHMA), and oligomer poly-1,4-cyclohexylene carbonate (PCHC) with poly(hydroxy ether of bisphenol-A) (Phenoxy), were investi- gated by differential scanning calorimeter (DSC), optical micro- scopy (OM), scanning electron microscopy (SEM), and Fourier- transform infrared spectroscopy (FT-IR). Only a single Tg was observed in the PS/PCHMA and P4MS/PCHMA blend systems. But the Tg's of neat components were quite close. So the miscibility of these blends were further examined using SEM. The PCHMA-rich (PCHMA>70wt %) compositions were indeed miscible but the PS-rich compositions were onlypartially miscible having sub-microne phase domains in the THF-cast PS/PCHMA ystem. The homogeneous phase structure was observed in P4MS/PCHMA system, which showed LCST behavior. The FT-IR result indicates that inter-molecular inter-actions are weak or non-specific for the PCHMA-PS pair or PCHMA-P4MS pair. PCHC/phenoxy system was found to be miscible. Molecular interactions between the components were examined.