Liquid-crystalline side chain polymethacrylates II. Variation of spacer and central linkage in nitro-terminated polymers |
| |
Authors: | R. Lorenz |
| |
Affiliation: | a Central Research Units, F. Hoffmann-La Roche, Basle, Switzerlandb BASF, Kunststoffiabor, Ludwigshafen, F. R. Germany |
| |
Abstract: | The thermal behaviour and the mesogenic properties of liquid-crystalline side chain polymers with the structure are described with n = 3, 6, 8 or 11 and Z = -COO-, -CONH- or -N=N-. The polymers were made by radical chain polymerization. Most of them exhibit smectic phases, nematic phases were not observed. The amide linkage which has not yet been described as a structural element in such polymers gives rise to polymers of high polarity and high glass transition temperatures (Tg). In all cases the amide polymers produced the highest Tg values, the ester polymers showing the lowest. The azo polymers exhibited the largest mesophase ranges and the highest clearing temperatures (Tc1) of all the materials investigated. Whereas the Tc1 values for the azopolymers are nearly independent of the length of the spacer those of the amide and ester polymers show rising clearing points with increasing spacer length. |
| |
Keywords: | |
本文献已被 InformaWorld 等数据库收录! |
|