Shear-induced Stabilization of the Nematic Phase in a Side Group-containing Poly (aryl ether ketone) Copol ymer
摘要
Polarized optical microscopes(POM) are commonly used to identify liquid crystalline tex tures. However, it is often found problematic to employ this technique in investigating the mesophase transition of polymeric materials due to their higher viscosities. Rheological mea surements at this juncture could provide us with valuable information about the mesophase transition of liquid crystalline polymers[1]. Accordingly, there have been some rheological in vestigations reported on thermotropic liquid crystalline polymers(TLCPs) due to the high sen sitivity of their rheological response to the morphological variation of the polymers[2～5].Introduction Polarized optical microscopes(POM) are commonly used to identify liquid crystalline tex tures. However, it is often found problematic to employ this technique in investigating the mesophase transition of polymeric materials due to their higher viscosities. Rheological mea surements at this juncture could provide us with valuable information about the mesophase transition of liquid crystalline polymers[1]. Accordingly, there have been some rheological in vestigations reported on thermotropic liquid crystalline polymers(TLCPs) due to the high sen sitivity of their rheological response to the morphological variation of the polymers[2～5].