New thermotropic chiral nematic copolymers using (1S,2S,3S,5R)-(+)- and (1R,2R,3R,5S)-([minus])-isopinocampheol as building blocks

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Macromolecules; (United States)

DOI:https://doi.org/10.1021/ma00226a002· OSTI ID:7173011

Chen, S H; Tsai, M L ^[1]

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1. Univ. of Rochester, NY (United States). Dept. of Chemical Engineering and Lab. for Laser Energetics

Thermotropic chiral nematic side-chain copolymers were synthesized and characterized by using (1S,2S,3S,5R)-(+)- and (1R,2R,3R,5S)-([minus])-isopinocampheol as the chiral building blocks. The helical twisting power was found to correlate with the volume swept out by the chiral pendant group via rotation for a given nematogenic monomer. However, the enhanced mesomorphic order introduced in both the nematogenic and chiral monomers as a result of an increased extent of conjugation or a shortened spacer length was found to reduce the helical twisting power of the resultant copolymer. Hence, both factors have to be taken into account as the helical twisting power of a copolymer system is to be optimized for a specific application. The present work also generalized the previous observation that the inversion of chirality of the pendant group results in helical sense reversal, although the role of the absolute configuration of the chiral moiety is not yet clearly understood.

• DOE Contract Number: FC03-85DP40200
• OSTI ID: 7173011
• Journal Information: Macromolecules; (United States), Journal Name: Macromolecules; (United States) Vol. 23:24; ISSN MAMOBX; ISSN 0024-9297
• Country of Publication: United States
• Language: English

Related Subjects

550200* -- Biochemistry
59 BASIC BIOLOGICAL SCIENCES
CHOLESTEROL
CONFIGURATION
COPOLYMERS
HELICAL CONFIGURATION
HYDROXY COMPOUNDS
MOLECULAR STRUCTURE
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERS
STEROIDS
STEROLS
SYNTHESIS