Main Chain Liquid Crystalline Semiflexible Polymers

2 Main Chain Liquid Crystalline Semiflexible Polymers 

However, the synthetic procedures leading to the above copolymers do not guarantee the achievement of the same microstructure. The as-obtained sequence distributions are probably unstable because the presence of transesterification reactions leads to highly complicated solid state behavior, which typically depends on the thermal history and processing conditions of the sample. Definite relations between the phase behavior, the molar mass, and the molar mass distribution are not easily available because 

Considering the above-mentioned problems, the rigid rod polymers are very inter-estig for numerous technological opportunities, but they are not suitable candidates for the assessment of reliable correlations between the molecular and structural characteristics and the mechanical and physio-chemical properties, including the tendencies to self-assemble and form mesophases. 

However, a few examples of polmers in which the rodlike units are placed with their long axes lying perpendicular to the polymer chain [9], according to the structure illustrated in Fig. 1 b, and in which the aniso-metric units present were of a disk-like shape (Fig. 1 c), were also reported [10]. A collection of papers and rather comprehensive reviews were published on these polymers [11-22]. 

---