Synthesis and dielectric properties of novel liquid crystalline triblock copolymers with cyanobiphenyl moieties and poly(n-butyl acrylate) segments
Identifieur interne : 000296 ( Main/Exploration ); précédent : 000295; suivant : 000297Synthesis and dielectric properties of novel liquid crystalline triblock copolymers with cyanobiphenyl moieties and poly(n-butyl acrylate) segments
Auteurs : Cuihong Zhang [République populaire de Chine] ; Dongrui Wang [République populaire de Chine] ; Jin He [République populaire de Chine] ; Tao Liang [République populaire de Chine] ; Guo-Hua Hu [France] ; Zhi-Min Dang [République populaire de Chine]Source :
- Polymers for Advanced Technologies [ 1042-7147 ] ; 2014-09.
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:
DOI: 10.1002/pat.3326
Affiliations:
- France, République populaire de Chine
- Grand Est, Lorraine (région)
- Metz, Nancy
- Centre national de la recherche scientifique, Laboratoire réactions et génie des procédés, Université de Lorraine
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R.China</addrLine><country key="CN"></country></address><ref type="url">http://en.ustb.edu.cn/</ref></desc></org></tutelle></tutelles></hal:affiliation><country>République populaire de Chine</country></affiliation></author></analytic><idno type="DOI">10.1002/pat.3326</idno><series><title level="j">Polymers for Advanced Technologies</title><idno type="ISSN">1042-7147</idno><imprint><date type="datePub">2014-09</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><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></front></TEI><affiliations><list><country><li>France</li><li>République populaire de Chine</li></country><region><li>Grand Est</li><li>Lorraine (région)</li></region><settlement><li>Metz</li><li>Nancy</li></settlement><orgName><li>Centre national de la recherche scientifique</li><li>Laboratoire réactions et génie des procédés</li><li>Université de Lorraine</li></orgName></list><tree><country name="République populaire de Chine"><noRegion><name sortKey="Zhang, Cuihong" sort="Zhang, Cuihong" uniqKey="Zhang C" first="Cuihong" last="Zhang">Cuihong Zhang</name></noRegion><name sortKey="Dang, Zhi Min" sort="Dang, Zhi Min" uniqKey="Dang Z" first="Zhi-Min" last="Dang">Zhi-Min Dang</name><name sortKey="He, Jin" sort="He, Jin" uniqKey="He J" first="Jin" last="He">Jin He</name><name sortKey="Liang, Tao" sort="Liang, Tao" uniqKey="Liang T" first="Tao" last="Liang">Tao Liang</name><name sortKey="Wang, Dongrui" sort="Wang, Dongrui" uniqKey="Wang D" first="Dongrui" last="Wang">Dongrui Wang</name></country><country name="France"><region name="Grand Est"><name sortKey="Hu, Guo Hua" sort="Hu, Guo Hua" uniqKey="Hu G" first="Guo-Hua" last="Hu">Guo-Hua Hu</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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