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      Polysiloxane-Based Side Chain Liquid Crystal Polymers: From Synthesis to Structure–Phase Transition Behavior Relationships

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          Abstract

          Organosilicon polymer materials play an important role in certain applications due to characteristics of much lower glass transition temperatures ( T g), viscosities, surface energy, as well as good mechanical, thermal stabilities, and insulation performance stemming from the higher bond energy and the larger bond angles of the adjacent silicon-oxygen bond. This critical review highlights developments in the synthesis, structure, and phase transition behaviors of polysiloxane-based side chain liquid crystal polymers (PSCLCPs) of linear and cyclic polysiloxanes containing homopolymers and copolymers. Detailed synthetic strategies are elaborated, and the relationship between molecular structures and liquid crystalline phase transition behaviors is systematically discussed, providing theoretical guidance on the molecular design of the materials.

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          Thiol-ene click chemistry.

          Following Sharpless' visionary characterization of several idealized reactions as click reactions, the materials science and synthetic chemistry communities have pursued numerous routes toward the identification and implementation of these click reactions. Herein, we review the radical-mediated thiol-ene reaction as one such click reaction. This reaction has all the desirable features of a click reaction, being highly efficient, simple to execute with no side products and proceeding rapidly to high yield. Further, the thiol-ene reaction is most frequently photoinitiated, particularly for photopolymerizations resulting in highly uniform polymer networks, promoting unique capabilities related to spatial and temporal control of the click reaction. The reaction mechanism and its implementation in various synthetic methodologies, biofunctionalization, surface and polymer modification, and polymerization are all reviewed.
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            Thiol-ene “click” reactions and recent applications in polymer and materials synthesis

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              Self-condensing vinyl polymerization: an approach to dendritic materials.

              Self-condensing vinyl polymerization was used to produce dendritic polymers with both highly branched structures and numerous reactive groups. A vinyl monomer will undergo self-polymerization if it contains a pendant group that can be transformed into an initiating moiety by the action of an external stimulus. The self-polymerization combines features of a classical vinyl polymerization process with those of a polycondensation because growth is accomplished by the coupling of reactive oligomers. Highly branched, irregular dendritic structures with a multiplicity of reactive functionalities are obtained by polymerization of 3-(1-chloroethyl)-ethenylbenzene.
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                Author and article information

                Journal
                Polymers (Basel)
                Polymers (Basel)
                polymers
                Polymers
                MDPI
                2073-4360
                19 July 2018
                July 2018
                : 10
                : 7
                : 794
                Affiliations
                [1 ]Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China; zhanglanying@ 123456pku.edu.cn (L.Z.); gaoyanzi@ 123456pku.edu.cn (Y.G.); zhangcuihong@ 123456pku.edu.cn (C.Z.)
                [2 ]Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, China
                [3 ]College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China; wenhuanyao@ 123456163.com
                Author notes
                [* ]Correspondence: yanghuai@ 123456pku.edu.cn ; Tel.: +86-10-6276-6919
                Author information
                https://orcid.org/0000-0003-1994-8531
                Article
                polymers-10-00794
                10.3390/polym10070794
                6403854
                f2d2a6cb-113b-4a55-9027-e11f535b5041
                © 2018 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 11 June 2018
                : 11 July 2018
                Categories
                Review

                linear and cyclic polysiloxanes,side chain liquid crystal polymers,synthetic strategies,phase structure

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