NDLI: Synthesis and self-assembly behaviours of side-chain smectic thiol–ene polymers based on the polysiloxane backbone

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Journal of Materials Chemistry C Vol - 4 Issue - 6

Journal of Materials Chemistry C Vol - 4 Issue - 5

Journal of Materials Chemistry C Vol -3

Journal of Materials Chemistry C Vol -2

Journal of Materials Chemistry C Vol -1

Synthesis and self-assembly behaviours of side-chain smectic thiol–ene polymers based on the polysiloxane backbone

Content Provider	Royal Society of Chemistry (RSC)
Author	Yu, Haifeng Zhang, Lanying Shen, Zhihao Yang, Dengke He, Baofeng Yang, Zhou He, Wanli Gao, Yanzi Yuan, Xiao Yao, Wenhuan Yang, Huai
Copyright Year	2016
Abstract	A series of polysiloxane side chain liquid crystal polymers (PSCLCPs) with chiral and achiral substitutions in the side chains, denoted as PMMS-Xchol-n (n = 0, 0.1, 0.15, 0.2, 0.3, 0.4, 0.5 0.6, 0.7. 0.8, 0.9, and 1.0, respectively, the molar content of the chiral cholesteric unit (Xchol) in a specific polymer), were successfully synthesized via thiol–ene click chemistry. The molecular structures of the polymers were confirmed by 1H-NMR, FT-IR, gel permeation chromatography (GPC) and thermogravimetric analysis (TGA). Their liquid crystalline (LC) properties and self-assembling behaviors were investigated in detail by a combination of various techniques, such as differential scanning calorimetry (DSC), polarized optical microscopy (POM), and X-ray diffraction. The results demonstrated that the phase transition behaviour and the self-assembly structure of the polymers were significantly influenced by Xchol and temperatures. With increased Xchol, the clearing points increased significantly, their mesogenic temperature ranges greatly widened, and abundant mesophases developed. Generally, two different types of LC phase structures and three different molecular arrangements were observed, depending on the two LC building blocks. Polymers with Xchol below 0.3 could self-assemble into a smectic E (SmE)-like structure and a single layer smectic A (SmAs) structure upon heating. When Xchol was between 0.4 and 0.7, a single phase structure of a SmAs or a bilayer smectic A (SmAd) could be observed. While for polymers with Xchol over 0.8, a SmAd phase structure was self-organized, further heating led to a SmAs structure. Moreover, when the molar ratio of the chiral group or achiral group was about 0.1, a microphase-separated smectic morphology could be found, indicating that the introduction of a small amount of any components in the copolymers might destroy the well-ordered structures.
Starting Page	1425
Ending Page	1440
Page Count	16
File Format	HTM / HTML PDF
ISSN	20507526
Volume Number	4
Issue Number	7
Journal	Journal of Materials Chemistry C
DOI	10.1039/c5tc04331j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Xchol Silicone Liquid crystal Chirality Concentration Polymer Click chemistry Fourier-transform infrared spectroscopy Gel permeation chromatography Thermogravimetric analysis Differential scanning calorimetry Optical microscope X-ray crystallography Phase transition Self-assembly
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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