V. Percec, H. Oda
Aug 1, 1995
Citations
0
Influential Citations
3
Citations
Journal
Journal of Macromolecular Science, Part A
Abstract
Abstract 4′-(11-Vinyloxyundecanyloxy)-4-biphenylyl (2R,3S)-2-fluro-3-methylpentanoate (15) (2R 94%ee) and 4′-(11-vinyloxyundecanyloxy)-4-biphenylyl (2S,3S)-2-fluoro-3-methylpentanoate (16) (2S 90%ee) diastereomers and their corresponding homopolymers with well-defined molecular weight and narrow molecular weight distribution were synthesized and characterized. The phase behavior of 15 and poly(15) is quite different from those of 16 and poly(16), respectively. 15 displays enantiotropic S A and S X (unidentified smectic) phases and a crystalline phase, while 16 displays only a monotropic S A phase and a crystalline phase. Both poly(15) and poly(16) display enantiotropic S A and S X2 (unidentified smectic) phases. An additional unidentified smectic phase (S X1) was observed for both low molecular weight polymers, i.e., at DP < 5 for poly(15) and at DP < 9 for poly(16). However, the transition temperatures of poly(15) are 15–20°C higher than those of poly(16) when their phase behaviors are compared using pol...