New polymer syntheses, 88. Thermosetting cholesterin oligocarbonates with propargyl endgroups

Autor:	Shih-Jieh Sun, Hans R. Kricheldorf
Rok vydání:	1997
Předmět:	Isosorbide Condensation polymer Polymers and Plastics Chemistry Mesogen Organic Chemistry Thermosetting polymer Propargyl alcohol Mole fraction Chloride chemistry.chemical_compound Polymer chemistry Propargyl Materials Chemistry medicine Organic chemistry medicine.drug
Zdroj:	Macromolecular Rapid Communications. 18:551-560
ISSN:	1521-3927 1022-1336
DOI:	10.1002/marc.1997.030180704
Popis:	Thermosetting cholesteric oligocarbonates were prepared by polycondensation of mesogenic diphenols such as 4,4′-dihydroxybiphenyl (DHB) or hydroquinone 4-hydroxy-benzoate (HQHB; system. name: 4-hydroxyphenyl 4-hydroxybenzoate) with methylhy-droquinone and isosorbide. Trichloromethyl chloroformate served as condensing agent and propargyl alcohol (system. name of propargyl: 2-propynyl), 4-propargyloxybenzoyl chloride or 6-propargyloxy-2-napthoyl chloride served as chain stoppers. Most oligocar-bonates form a cholesteric phase over a broad temperature range. Depending on the mole fraction of isosorbide these oligocarbonates form Grandjean textures when sheared in the molten state.
Databáze:	OpenAIRE
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