화학공학소재연구정보센터
Macromolecules, Vol.28, No.20, 6957-6962, 1995
Liquid-Crystalline Side-Group Block-Copolymers with N-Butyl Methacrylate as an Amorphous A-Block - Synthesis and Characterization
A second system of liquid crystalline (LC) side group block, copolymers with n-butyl methacrylate as an amorphous A-block has been synthesized and characterized. The system poly(n-butyl methacrylate)/poly[2-((((3-cholesteryl)oxy)carbonyl)oxy)ethyl ethacrylate] (PBMA/PChEMA) displays a similar phase diagram and macroscopic and microscopic interaction between the morphological structure and the LC behavior of LC side group block copolymers as the system polystyrene (PS)/PChEMA. A formation of a disordered (nematic) phase is also seen in those samples where the LC subphase is not continuous (spheres), whereas in all samples in which there is a continuous LC subphase, the smectic A phase of the homopolymer is formed. For volume fractions of PBMA (Phi(PBMA)) approximate to 0.6-0.7, a cylindrical structure of the LC subphase was expected. The formation of the smectic A phase in the subphase like that displayed in the homopolymer PChEMA seems to be more favorable than the formation of an equilibrium morphology. The orientation of the LC subphase with respect to the orientation of the morphological elements is dependent on the morphological structure.