Synthesis of discotic columnar side-chain liquid crystalline polymers by ring-opening metathesis polymerization (ROMP)

被引：94

作者：

Weck, M ^{[1
]}

Mohr, B ^{[1
]}

Maughon, BR ^{[1
]}

Grubbs, RH ^{[1
]}

机构：

[1] CALTECH,DIV CHEM & CHEM ENGN,ARNOLD & MABEL BECKMAN LABS CHEM SYNTHESIS,PASADENA,CA 91125

来源：

MACROMOLECULES | 1997年 / 30卷 / 21期

关键词：

D O I：

10.1021/ma970292x

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Discotic liquid crystalline polymers bearing alkoxy-substituted triphenylene moieties in the side-chain were synthesized by ring-opening metathesis polymerization using a well-defined ruthenium initiator. To elucidate the effect of backbone flexibility on the mesomorphism, norbornene and cyclobutene monomers containing triphenylene moieties were synthesized, which yielded the relatively rigid poly(norbornene)s and the more flexible poly(butadiene)s, respectively, after polymerization. To further increase the backbone flexibility, the poly(butadiene)s were hydrogenated using Crabtree's catalyst to yield triphenylene-substituted poly(butane)s. The mesomorphic behavior of the polymers has been investigated by differential scanning calorimetry (DSC) and powder diffraction X-ray scattering (wide angle X-ray scattering, WAXS). All polymers bearing a 2,3,6,7,19-pentakis(decyloxy)triphenylene-based mesogenic unit exhibit enantiotropic discotic hexagonal mesophases, while the pentoxy analogues do not display liquid crystalline behavior. No effect of backbone rigidity on the mesomorphism could be detected.

引用

页码：6430 / 6437

页数：8

共 77 条

[31] Electronic properties of discotic LC-materials [J].

Haarer, D ;

Simmerer, J ;

Schuhmacher, P ;

Paulus, W ;

Etzbach, KH ;

Siemensmeyer, K ;

Ringsdorf, H .

MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1996, 283 :63-68

[32] PHOTOCONDUCTIVITY IN DISCOTIC LIQUID-CRYSTALS - A NEW CLASS OF HIGH-MOBILITY MATERIALS [J].

HAARER, D ;

ADAM, D ;

SIMMERER, J ;

CLOSS, F ;

FUNHOFF, D ;

HAUSSLING, L ;

SIEMENSMEYER, K ;

RINGSDORF, H ;

SCHUHMACHER, P .

MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1994, 252 :155-164

[33] THE OXIDATIVE CONVERSION OF (E)-ALPHA-(ARYLMETHYLENE)-BENZENEACETATES INTO SUBSTITUTED PHENANTHRENES - THE PROPITIOUS USE OF BORON-TRIFLUORIDE WITH VANADIUM TRIFLUORIDE OXIDE [J].

HALTON, B ;

MAIDMENT, AI ;

OFFICER, DL ;

WARNES, JM .

AUSTRALIAN JOURNAL OF CHEMISTRY, 1984, 37 (10) :2119-2128

[34] THE SYNTHESIS OF ALKOXYBROMOTRIPHENYLENES - NEW DISCOTIC LIQUID-CRYSTALS AND VALUABLE PRECURSORS TO MIXED TAIL DISCOTICS [J].

HENDERSON, P ;

KUMAR, S ;

REGO, JA ;

RINGSDORF, H ;

SCHUHMACHER, P .

JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS, 1995, (10) :1059-1060

[35] SYNTHESIS OF FUNCTIONALIZED TRIPHENYLENES AND DIBENZOPYRENES - PRECURSOR MOLECULES FOR POLYMERIC DISCOTIC LIQUID-CRYSTALS [J].

HENDERSON, P ;

RINGSDORF, H ;

SCHUHMACHER, P .

LIQUID CRYSTALS, 1995, 18 (02) :191-195

[36] Investigation of the effect of bulky lateral substituents on the discotic mesophase behaviour of triphenylene benzoates [J].

Hindmarsh, P ;

Watson, MJ ;

Hird, M ;

Goodby, JW .

JOURNAL OF MATERIALS CHEMISTRY, 1995, 5 (12) :2111-2123

[37]

JACOBINE AF, 1989, POLYM MAT SCI ENG, V60, P134

[38] Oligomeric 1,3,5-triazines containing disc-shaped penta-alkyne and triphenylene side groups [J].

Janietz, D ;

Festag, R ;

Schmidt, C ;

Wendorff, JH .

LIQUID CRYSTALS, 1996, 20 (04) :459-467

[39] COLUMNAR ORDERING OF LIQUID-CRYSTALLINE DISCOTICS IN LANGMUIR-BLODGETT-FILMS [J].

KARTHAUS, O ;

RINGSDORF, H ;

TSUKRUK, VV ;

WENDORFF, JH .

LANGMUIR, 1992, 8 (09) :2279-2283

[40] Liquid-crystalline heterocyclic phthalocyanine analogues based on thiophene [J].

Knawby, DM ;

Swager, TM .

CHEMISTRY OF MATERIALS, 1997, 9 (02) :535-538

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