Self-assembled shape-memory fibers of triblock liquid-crystal polymers

被引：234

作者：

Ahir, SV ^{[1
]}

Tajbakhsh, AR ^{[1
]}

Terentjev, EM ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

ADVANCED FUNCTIONAL MATERIALS | 2006年 / 16卷 / 04期

关键词：

D O I：

10.1002/adfm.200500692

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

New thermoplastic liquid-crystalline elastomers have been synthesized using the telechelic principle of microphase separation in triblock copolymers. The large central block is made of a main-chain nematic polymer renowned for its large spontaneous elongation along the nematic director. The effective crosslinking is established by small terminal blocks formed of terphenyl moieties, which phase separate into semicrystalline micelles acting as multifunctional junction points of the network. The resulting transient network retains the director alignment and shows a significant shape-memory effect, characteristic and exceeding that of covalently bonded nematic elastomers. Its plasticity at temperatures above the nematic-isotropic transition allows drawing thin well-aligned fibers from the melt. The fibers have been characterized and their thermal actuator behavior-reversible contraction of heating and elongation on cooling-has been investigated.

引用

页码：556 / 560

页数：5

共 15 条

[1] Liquid-crystalline main-chain elastomers [J].

Bergmann, GHF ;

Finkelmann, H ;

Percec, V ;

Zhao, MY .

MACROMOLECULAR RAPID COMMUNICATIONS, 1997, 18 (05) :353-360

[2] Artificial muscles based on nematic gels [J].

deGennes, PG ;

Hebert, M ;

Kant, R .

MACROMOLECULAR SYMPOSIA, 1997, 113 :39-49

[3] Simple and versatile synthetic route for the preparation of main-chain, liquid-crystalline elastomers [J].

Donnio, B ;

Wermter, H ;

Finkelmann, H .

MACROMOLECULES, 2000, 33 (21) :7724-7729

[4] Polydomain-monodomain transition in nematic elastomers [J].

Fridrikh, SV ;

Terentjev, EM .

PHYSICAL REVIEW E, 1999, 60 (02) :1847-1857

[5]

GOODMAN I, 1982, DEV BLOCK COPOLYMERS

[6] Self-assembled liquid-crystalline gels designed from the bottom up [J].

Kempe, MD ;

Scruggs, NR ;

Verduzco, R ;

Lal, J ;

Kornfield, JA .

NATURE MATERIALS, 2004, 3 (03) :177-182

[7]

KUPFER J, 1991, MAKROMOL CHEM-RAPID, V12, P717

[8] An artificial muscle with lamellar structure based on a nematic triblock copolymer [J].

Li, MH ;

Keller, P ;

Yang, JY ;

Albouy, PA .

ADVANCED MATERIALS, 2004, 16 (21) :1922-+

[9] STUDY OF THE CHAIN CONFORMATION OF THERMOTROPIC NEMATIC MAIN-CHAIN POLYESTERS [J].

LI, MH ;

BRULET, A ;

COTTON, JP ;

DAVIDSON, P ;

STRAZIELLE, C ;

KELLER, P .

JOURNAL DE PHYSIQUE II, 1994, 4 (10) :1843-1863

[10] Nematic elastomer fiber actuator [J].

Naciri, J ;

Srinivasan, A ;

Jeon, H ;

Nikolov, N ;

Keller, P ;

Ratna, BR .

MACROMOLECULES, 2003, 36 (22) :8499-8505

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