Liquid crystalline side-chain triblock copolymers consisting of a nematic central subblock edged by photochromic azobenzene-containing fragments : their synthesis, structure and photooptical behaviour. / Odarchenko, Yaroslav.

In: Polymer Chemistry, Vol. 6, No. 35, 16.07.2015, p. 6358-6371.

Research output: Contribution to journalArticlepeer-review

Published

Standard

Harvard

APA

Vancouver

Author

BibTeX

@article{6c076cb6eab046a3985131c3cecafa35,
title = "Liquid crystalline side-chain triblock copolymers consisting of a nematic central subblock edged by photochromic azobenzene-containing fragments: their synthesis, structure and photooptical behaviour",
abstract = "For the first time, symmetrical photosensitive fully liquid crystalline side chain triblock copolymers (pAzo-b-pPhM-b-pAzo) and random copolymers (pAzo-ran-pPhM) with nematogenic phenyl benzoate (PhM) and photosensitive smectogenic azobenzene containing groups (Azo) were synthesized by the combination of RAFT polymerization and subsequent chemical modification. The central block of synthesized photochromic block copolymers contains 80 PhM groups, while the length of “peripheral” blocks includes 4 or 10 Azo units. The microphase separation structure is observed in the block copolymer when the length of a subblock with Azo groups reaches ten monomeric units. The influence of photochromic polymers{\textquoteright} molecular architecture (homopolymer, block copolymer and random copolymer) on the photochemical and photoorientation processes induced by light in their amorphous films has been revealed. The optical anisotropy induced in block copolymer films by illumination with linearly polarized 546 nm light was studied and the results were compared with those of the Azo homopolymer and of a random copolymer with a similar composition. It was found that practically only Azo groups are included in the process of photoinduced orientation in films of block copolymers, whereas the orientational cooperative effect of both azobenzene chromophore and phenyl benzoate mesogenic groups is observed in the case of a random copolymer.",
author = "Yaroslav Odarchenko",
year = "2015",
month = jul,
day = "16",
doi = "10.1039/C5PY00555H",
language = "English",
volume = "6",
pages = "6358--6371",
journal = " Polymer Chemistry",
issn = "1759-9954",
publisher = "Royal Society of Chemistry",
number = "35",

}

RIS

TY - JOUR

T1 - Liquid crystalline side-chain triblock copolymers consisting of a nematic central subblock edged by photochromic azobenzene-containing fragments

T2 - their synthesis, structure and photooptical behaviour

AU - Odarchenko, Yaroslav

PY - 2015/7/16

Y1 - 2015/7/16

N2 - For the first time, symmetrical photosensitive fully liquid crystalline side chain triblock copolymers (pAzo-b-pPhM-b-pAzo) and random copolymers (pAzo-ran-pPhM) with nematogenic phenyl benzoate (PhM) and photosensitive smectogenic azobenzene containing groups (Azo) were synthesized by the combination of RAFT polymerization and subsequent chemical modification. The central block of synthesized photochromic block copolymers contains 80 PhM groups, while the length of “peripheral” blocks includes 4 or 10 Azo units. The microphase separation structure is observed in the block copolymer when the length of a subblock with Azo groups reaches ten monomeric units. The influence of photochromic polymers’ molecular architecture (homopolymer, block copolymer and random copolymer) on the photochemical and photoorientation processes induced by light in their amorphous films has been revealed. The optical anisotropy induced in block copolymer films by illumination with linearly polarized 546 nm light was studied and the results were compared with those of the Azo homopolymer and of a random copolymer with a similar composition. It was found that practically only Azo groups are included in the process of photoinduced orientation in films of block copolymers, whereas the orientational cooperative effect of both azobenzene chromophore and phenyl benzoate mesogenic groups is observed in the case of a random copolymer.

AB - For the first time, symmetrical photosensitive fully liquid crystalline side chain triblock copolymers (pAzo-b-pPhM-b-pAzo) and random copolymers (pAzo-ran-pPhM) with nematogenic phenyl benzoate (PhM) and photosensitive smectogenic azobenzene containing groups (Azo) were synthesized by the combination of RAFT polymerization and subsequent chemical modification. The central block of synthesized photochromic block copolymers contains 80 PhM groups, while the length of “peripheral” blocks includes 4 or 10 Azo units. The microphase separation structure is observed in the block copolymer when the length of a subblock with Azo groups reaches ten monomeric units. The influence of photochromic polymers’ molecular architecture (homopolymer, block copolymer and random copolymer) on the photochemical and photoorientation processes induced by light in their amorphous films has been revealed. The optical anisotropy induced in block copolymer films by illumination with linearly polarized 546 nm light was studied and the results were compared with those of the Azo homopolymer and of a random copolymer with a similar composition. It was found that practically only Azo groups are included in the process of photoinduced orientation in films of block copolymers, whereas the orientational cooperative effect of both azobenzene chromophore and phenyl benzoate mesogenic groups is observed in the case of a random copolymer.

U2 - 10.1039/C5PY00555H

DO - 10.1039/C5PY00555H

M3 - Article

VL - 6

SP - 6358

EP - 6371

JO - Polymer Chemistry

JF - Polymer Chemistry

SN - 1759-9954

IS - 35

ER -