Nonmesogenic side chains

Hydrogen-Bonded Comb Copolymers Nonmesogenic Side Chains. 129... 

Another recent report (18) Involves the evaluation of phosphazenes with nonmesogen side chains that exhibit NLO activity. Modification of the intrinsic optical response of the P-N chain was achieved through substitution of side groups including chloro, anilino, dimethylamino, and trifluoroethoxy. Cyclic phosphazenes were also included in this study. Results suggest that phosphazenes possess inherent NLO activity which can be enhanced by the suitable selection of substituent groups. 

Both thermotropie and lyotropic liquid crystal polymers exhibit eharacteristic micro-strueture features [9,10]. Anisometrieal monomers such as rods or disks are conneeted to ehains in an appropriate manner. These anisometrieal monomers are considered the mesogens and may be part of main ehain LCP, side chain LCP, or of both types together (Fig. 6). Flexible spacers of nonmesogenic character are located between the mesogens. A sufficient flexibility is a prerequisite for the liquid crystal formation with an increase in temperature or solvent concentration. 

Therefore, copolymerization of a mesogenic monomer with a nonmesogenic monomer whose homopolymer has a lower glass transition temperature can be used to both eliminate side-chain crystallization and to depress the glass transition tempera-... 

Meng FB, Zhang BY, Xiao WQ, Hu TX. 2005. Effect of nonmesogenic crosslinking units on the mesogenic properties of side chain cholesteric liquid crystalline elastomers. J Appl Polym Sci 96 625 631. 

Saenger, J. and Gronski, W. (1997) Side-chain liquid-crystalline copolymers with nonmesogenic comonomers. Influence of comonomer content on the nature of the mesophase. Macromol... 

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