Accession Number : ADA189614

Title :   Mesogenic Rodlike Aromatic Polyesters.

Descriptive Note : Final rept. 1 Mar 84-31 Aug 87,

Corporate Author : DUKE UNIV DURHAM NC DEPT OF CHEMISTRY

Personal Author(s) : Krigbaum, William R

PDF Url : ADA189614

Report Date : 05 Dec 1987

Pagination or Media Count : 7

Abstract : We have explored the effect of substituents on the crystal nematic and nematic isotropic transition temperatures of poly (p-phenylene terephthalate). The substituents halogen, phenyl, and hexyl replaced hydrogen on the ring of hydroquinone or terephthalic acid. One gets a much larger reduction of the transition temperatures if a phenyl substituent is on terephthalic acid. We believe this substituent forces the carbonyl group out of the ring plane, and creates a more flexible link.

Descriptors :   *AROMATIC HYDROCARBONS, *POLYESTER PLASTICS, ACIDS, HYDROGEN, PHENOLS, PHTHALIC ACIDS, RINGS, TRANSITION TEMPERATURE

Subject Categories : Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE