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Titolo:
CORRELATION OF MODEL COMPOUNDS AND LATERALLY ATTACHED SIDE-CHAIN LIQUID-CRYSTALLINE POLYNORBORNENES WITH A 1-CARBON SPACER
Autore:
PUGH C; DHARIA J; AREHART SV;
Indirizzi:
UNIV MICHIGAN,CTR MACROMOL SCI & ENGN,DEPT CHEM ANN ARBOR MI 48109
Titolo Testata:
Macromolecules
fascicolo: 16, volume: 30, anno: 1997,
pagine: 4520 - 4532
SICI:
0024-9297(1997)30:16<4520:COMCAL>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIVING CATIONIC POLYMERIZATION; OCTYL ALKYL-GROUPS; OPENING METATHESIS POLYMERIZATION; QUATERNARY AMMONIUM POLYHALIDES; STRUCTURE-PROPERTY RELATIONSHIPS; CHIRAL SMECTIC-C; THERMOTROPIC BEHAVIOR; MESOGENIC GROUPS; SPONTANEOUS POLARIZATION; NORBORNENE DERIVATIVES;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
117
Recensione:
Indirizzi per estratti:
Citazione:
C. Pugh et al., "CORRELATION OF MODEL COMPOUNDS AND LATERALLY ATTACHED SIDE-CHAIN LIQUID-CRYSTALLINE POLYNORBORNENES WITH A 1-CARBON SPACER", Macromolecules, 30(16), 1997, pp. 4520-4532

Abstract

-Bis[(3'-fluoro-4'-n-alkoxyphenyl)ethynyl]toluenes mimic the thermotropic behavior of oxy]benzyl]oxy]carbonyl]bicyclo[2.2.1]hept-2-ene}s better than 1,4-bis[(3'-fluoro-4'-n-alkoxyphenyl)ethynyl] do. Polymers with approximately 50 repeat units and narrow polydispersity (pdi = 1.08-1.23) were prepared by ring-opening metathesis polymerization of ynyl]benzyl]oxy]carbonyl}bicyclo[2.2.1]hept-2-enes in THF using Mo(CHCMe2Ph)(N-2,6-(Pr2Ph)-Pr-i)((OBu)-Bu-t)(2) as the initiator. All of the polymers exhibit an enantiotropic nematic mesophase in addition to the glass transition, and those with n = 3-12 slowly organize into a crystalline or s(E) phase that occurs over an extremely narrow temperature range. Whereas -bis[(3'-fluoro-4'-n-alkoxyphenyl)ethynyl]benzenes exhibit a k-s(E)-s(C)-n-i phase sequence when n = 6-12, all of the -bis[(3'-fluoro-4'-n-alkoxyphenyl)ethynyl]toluenes exhibit a nematic mesophase, and those with n = 9-12 also exhibit either a monotropic s(C) mesophase or an enantiotropic s(C) mesophase over a very narrow temperature range.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 08:02:01