LrgpV1, Hal, Corpus, bibRecord, 000B01

Synthesis and dielectric properties of novel liquid crystalline triblock copolymers with cyanobiphenyl moieties and poly(n-butyl acrylate) segments

Identifieur interne : 000B01 ( Hal/Corpus ); précédent : 000B00; suivant : 000B02

Synthesis and dielectric properties of novel liquid crystalline triblock copolymers with cyanobiphenyl moieties and poly(n-butyl acrylate) segments

Auteurs : Cuihong Zhang ; Dongrui Wang ; Jin He ; Tao Liang ; Guo-Hua Hu ; Zhi-Min Dang

Source :

Polymers for Advanced Technologies [ 1042-7147 ] ; 2014-09.

RBID : Hal:hal-01275128

Abstract

In this work, self-assembly method was used to improve the dielectric constant of triblock copolymers. A series of ABA triblock copolymers with a defined length of poly(n-butyl acrylate) (PBA, B block) segment and different lengths of liquid crystalline (LC) poly[11-(4-cyano-4'-biphenoxy)undecyl methacrylate] (P11CBMA, A block) segments were synthesized by using the atom transfer radical polymerization method. The well-defined triblock copolymers P11CBMA(m)-b-PBA(n)-b-P11CBMA(m) possess three different B/A ratios (n = 50, m = 17, 43, 53). Due to the supramolecular cooperative motion effect, the copolymers can form worm-like microstructure (W-LC = 52.8%), cylinder-like nanostructure with P11CBMA phase embedded in PBA matrix (W-LC = 73.9%), and wide stripe structure with LC domains distributed unevenly in a continuous PBA matrix (W-LC = 77.7%) after annealed at 160 degrees C (above T-i) under N-2 for 24 h, respectively. In order to study the influence of microphase separated morphology of triblock copolymer on the dielectric properties, solvent annealing was also used to develop various nanostructures. After thermal or solvent annealing, the dielectric constants of block copolymers increased dramatically while their loss factors remained the same. For different block copolymers, the dielectric constants increased with the increase of the LC block length. For diverse treatments, dielectric permittivities of samples varied widely with different nanostructures. The results show that the dielectric constants of block copolymers could be tuned by the block ratios and the self-assembled microstructures. These findings will inspire researchers using self-assembly method to design and develop novel flexible materials with high dielectric permittivity.

Url:

https://hal.univ-lorraine.fr/hal-01275128

DOI: 10.1002/pat.3326

Links to Exploration step

Hal:hal-01275128

Le document en format XML

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<front><div type="abstract" xml:lang="en">In this work, self-assembly method was used to improve the dielectric constant of triblock copolymers. A series of ABA triblock copolymers with a defined length of poly(n-butyl acrylate) (PBA, B block) segment and different lengths of liquid crystalline (LC) poly[11-(4-cyano-4'-biphenoxy)undecyl methacrylate] (P11CBMA, A block) segments were synthesized by using the atom transfer radical polymerization method. The well-defined triblock copolymers P11CBMA(m)-b-PBA(n)-b-P11CBMA(m) possess three different B/A ratios (n = 50, m = 17, 43, 53). Due to the supramolecular cooperative motion effect, the copolymers can form worm-like microstructure (W-LC = 52.8%), cylinder-like nanostructure with P11CBMA phase embedded in PBA matrix (W-LC = 73.9%), and wide stripe structure with LC domains distributed unevenly in a continuous PBA matrix (W-LC = 77.7%) after annealed at 160 degrees C (above T-i) under N-2 for 24 h, respectively. In order to study the influence of microphase separated morphology of triblock copolymer on the dielectric properties, solvent annealing was also used to develop various nanostructures. After thermal or solvent annealing, the dielectric constants of block copolymers increased dramatically while their loss factors remained the same. For different block copolymers, the dielectric constants increased with the increase of the LC block length. For diverse treatments, dielectric permittivities of samples varied widely with different nanostructures. The results show that the dielectric constants of block copolymers could be tuned by the block ratios and the self-assembled microstructures. These findings will inspire researchers using self-assembly method to design and develop novel flexible materials with high dielectric permittivity.</div>
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<author role="aut"><persName><forename type="first">Dongrui</forename>
<surname>Wang</surname>
</persName>
<idno type="halAuthorId">807574</idno>
<affiliation ref="#struct-133558"></affiliation>
</author>
<author role="aut"><persName><forename type="first">Jin</forename>
<surname>He</surname>
</persName>
<idno type="halAuthorId">1295185</idno>
<affiliation ref="#struct-133558"></affiliation>
</author>
<author role="aut"><persName><forename type="first">Tao</forename>
<surname>Liang</surname>
</persName>
<idno type="halAuthorId">1295186</idno>
<affiliation ref="#struct-133558"></affiliation>
</author>
<author role="aut"><persName><forename type="first">Guo-Hua</forename>
<surname>Hu</surname>
</persName>
<idno type="halAuthorId">95927</idno>
<affiliation ref="#struct-211875"></affiliation>
</author>
<author role="aut"><persName><forename type="first">Zhi-Min</forename>
<surname>Dang</surname>
</persName>
<email>dangzm@ustb.edu.cn</email>
<idno type="halAuthorId">532145</idno>
<affiliation ref="#struct-133558"></affiliation>
</author>
</analytic>
<monogr><idno type="halJournalId" status="VALID">18125</idno>
<idno type="issn">1042-7147</idno>
<idno type="eissn">1099-1581</idno>
<title level="j">Polymers for Advanced Technologies</title>
<imprint><publisher>Wiley</publisher>
<biblScope unit="volume">25</biblScope>
<biblScope unit="issue">9</biblScope>
<biblScope unit="pp">920-926</biblScope>
<date type="datePub">2014-09</date>
</imprint>
</monogr>
<idno type="doi">10.1002/pat.3326</idno>
</biblStruct>
</sourceDesc>
<profileDesc><langUsage><language ident="en">English</language>
</langUsage>
<textClass><classCode scheme="halDomain" n="chim">Chemical Sciences</classCode>
<classCode scheme="halTypology" n="ART">Journal articles</classCode>
</textClass>
<abstract xml:lang="en">In this work, self-assembly method was used to improve the dielectric constant of triblock copolymers. A series of ABA triblock copolymers with a defined length of poly(n-butyl acrylate) (PBA, B block) segment and different lengths of liquid crystalline (LC) poly[11-(4-cyano-4'-biphenoxy)undecyl methacrylate] (P11CBMA, A block) segments were synthesized by using the atom transfer radical polymerization method. The well-defined triblock copolymers P11CBMA(m)-b-PBA(n)-b-P11CBMA(m) possess three different B/A ratios (n = 50, m = 17, 43, 53). Due to the supramolecular cooperative motion effect, the copolymers can form worm-like microstructure (W-LC = 52.8%), cylinder-like nanostructure with P11CBMA phase embedded in PBA matrix (W-LC = 73.9%), and wide stripe structure with LC domains distributed unevenly in a continuous PBA matrix (W-LC = 77.7%) after annealed at 160 degrees C (above T-i) under N-2 for 24 h, respectively. In order to study the influence of microphase separated morphology of triblock copolymer on the dielectric properties, solvent annealing was also used to develop various nanostructures. After thermal or solvent annealing, the dielectric constants of block copolymers increased dramatically while their loss factors remained the same. For different block copolymers, the dielectric constants increased with the increase of the LC block length. For diverse treatments, dielectric permittivities of samples varied widely with different nanostructures. The results show that the dielectric constants of block copolymers could be tuned by the block ratios and the self-assembled microstructures. These findings will inspire researchers using self-assembly method to design and develop novel flexible materials with high dielectric permittivity.</abstract>
</profileDesc>
</hal>
</record>

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Synthesis and dielectric properties of novel liquid crystalline triblock copolymers with cyanobiphenyl moieties and poly(n-butyl acrylate) segments

Synthesis and dielectric properties of novel liquid crystalline triblock copolymers with cyanobiphenyl moieties and poly(n-butyl acrylate) segments

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