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Design, Synthesis, and phase behaviors of a novel triphenylene-based side chain liquid crystalline diblock copolymers

Abstract

A novel double Tp-based liquid crystalline (LC) diblock copolymer (PMTS-b-PMT6S) composed of poly[3, 6, 7, 10, 11-pentakis (hexyloxy)-2 -oxytriphenylene] (PMTS) and poly{6-[3, 6, 7, 10, 11-pentakis (hexyloxy)-2 -oxytriphenylene]} (PMT6S) was designed and successfully synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. Whereas PMTS is a rigid columnar-shaped (ΦN) polymer, PMT6S is a stable hexagonal columnar phase (ΦH) polymer. The phase behaviors of diblock copolymers were studied by DSC, POM and 1D WAXD. The results showed that the weight fraction of PMT6S (fPMT6S) has significant effect on the LC phase behaviors and phase structures of diblock copolymers. The glass transition temperature and the phase transition temperature of the diblock copolymers from LC phase to isotropic phase both reduced with the weight fraction of PMT6S in feed. When the fPMT6S ≤ 58.1%, PMTS-b-PMT6S-1 ~ PMTS-b-PMT6S-3 shows similar properties to PMTS, formed stable column nematic phase (ΦN); While the fPMT6S ≥ 64.2%, PMTS-b-PMT6S-4 and PMTS-b-PMT6S-5 shows similar properties to PMT6S, presenting the symmetry hexagonal columnar phase (ΦH). The comparison between the diblock copolymer and homopolymer (PMTS and PMT6S), indicates that the content of the spacer was crucial to determine the LC structures. Though the study, can better understanding of the interrelation of microstructures and Tp DLCs orders constitutes the key basis for variant applications.

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Publication details

The article was received on 24 May 2018, accepted on 09 Jul 2018 and first published on 10 Jul 2018


Article type: Paper
DOI: 10.1039/C8NJ02568A
Citation: New J. Chem., 2018, Accepted Manuscript
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    Design, Synthesis, and phase behaviors of a novel triphenylene-based side chain liquid crystalline diblock copolymers

    J. Ban, L. Pan, B. Shi and H. Zhang, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02568A

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