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Polymeric liquid crystals: structural basis for ferroelectric and nonlinear optical properties
Author(s) -
Zentel R.,
Poths H.,
Kremer F.,
Schönfeld A.,
Jungbauer D.,
Twieg R.,
Willson C. G.,
Yoon D.
Publication year - 1992
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1992.220030504
Subject(s) - materials science , polymer , ferroelectricity , elastomer , liquid crystal , polar , molecule , piezoelectricity , nonlinear optical , nonlinear system , composite material , chemical engineering , organic chemistry , dielectric , optoelectronics , chemistry , physics , astronomy , quantum mechanics , engineering
This paper describes the rational design and structure–property relations in three different types of polar LC polymers with interesting material properties, as follows. (i) Chiral LC polymers, which are functionalized with crosslinkable groups, can be converted into LC elastomers with chiral smectic C * phases. The mechanical orientability of these elastomers leads to new piezoelectric materials. (ii) The curing (dense crosslinking) of a polymer matrix provides one possibility of stabilizing the polar order of dye molecules, which is necessary for frequency doubling. Additionally, LC phases can help to stabilize this polar structure, which leads to large and stable nonlinear optical coefficients. (iii) Polymer analogous esterifications offer a convenient method for the synthesis of chiral smectic C * polymers with large ferrolectric polarizations.