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Synthesis and liquid‐crystalline properties of thermotropic homopolycarbonates
Author(s) -
De Backer Christel,
Van Beylen Marcel,
Ottenburgs Raoul,
Samyn Celest
Publication year - 1995
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1995.021960512
Subject(s) - naphthalene , mesophase , biphenyl , thermotropic crystal , polymer chemistry , mesogen , liquid crystal , chemistry , copolymer , polymer , condensation polymer , materials science , organic chemistry , phase (matter) , liquid crystalline , optoelectronics
Six series of polycarbonates with flexible spacers have been prepared by melt condensation of aromatic diols such as 4,4′‐bis[(2‐hydroxyethyl)oxy]biphenyl, 4,4′‐bis [(6‐hydroxyhexyl)oxy]biphenyl, 1,5‐bis[(2‐hydroxyethyl)oxy]naphthalene, 1,5‐bis[(6‐hydroxyhexyl)oxy]naphthalene, 2,6‐bis[(2‐hydroxyethyl)oxy]naphthalene, 2,6‐bis[(6‐hydroxyhexyl)oxy]naphthalene, 4,4′‐bis[(6‐hydroxyhexyl)oxy]stilbene, 3,3′‐dimethyl‐4,4′‐bis[(2‐hydroxyethyl)oxy]stilbene, 3,3′‐dimethyl‐4,4′‐bis[(6‐hydroxyhexyl)oxy]stilbene, 4,4′‐bis[(2‐hydroxyethyl)oxy]‐α‐methylstilbene and 4,4′‐bis[(6‐hydroxyhexyl)oxy]‐α‐methylstilbene For systematic IUPAC nomenclature see Experimental part. with several alkylene diphenyl dicarbonates. Polycarbonates with biphenyl and stilbene mesogenic groups show liquid‐crystalline behavior with the formation of a nematic phase over a temperature range of 46°C and 21°C, respectively. Amorphous polycarbonates were obtained when 1,5‐naphthalene or α‐methylstilbene groups are incorporated. Polymers with 2,6‐naphthalene and 3,3′‐dimethylstilbene groups show mesophase formation up to a certain spacer length, a transition range of 15°C and 28°C, respectively, being observed.