Abstract
Organosilicon polymer materials play an important role in certain applications due to characteristics of much lower glass transition temperatures (Tg), 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.
Highlights
Organosilicon polymers, which can be divided into three categories—polyorganosiloxanes, polyorganosilanes, and polyorganosilicons—according to structural differences in the main chain, have received widespread attention as one of the most important inorganic backbone polymers since commercial products were developed in the 1940s [1,2]
Side Chain Liquid Crystal Polymers (SCLCPs), which integrate the special anisotropy of liquid crystalline materials with the excellent mechanical performance of polymers, have attracted extensive attention over the past few decades [5,6,7,8]
In comparison with polyacrylates based on similar structure and polarity of cyanobiphenyl side groups reported by Parneix et al [98], activation energies ranged from 241 kJ mol−l in a nematic material to 126 kJ mol−1 for a smectic polymer; the higher values in evaluation with our results reflect on the fact that the polyacrylate backbone is less flexible than the polysiloxane one
Summary
Organosilicon polymers, which can be divided into three categories—polyorganosiloxanes, polyorganosilanes, and polyorganosilicons—according to structural differences in the main chain, have received widespread attention as one of the most important inorganic backbone polymers since commercial products were developed in the 1940s [1,2]. The siloxane main chain can be linear or cyclic, and the based on carbon-carbon main chain, silicon-oxygen main chain is easier to introduce various LC rigid LC mesogens can be of any shape (such as rod, disk, or ring) or with different polarities; a tiny mesogens into the side chain by post-modification method, making them a promising functional change in structure will bring about great changes of materials in nature. Finkelmann under the guidance of strategies and the relationship between the molecular structures and LC phase transition behaviors the flexible decoupling strategy [14], a long list of PSCLCPs have been prepared and characterized. In to thisprovide critical review, the long list of for PSCLCPs is summarized from synthetic and structure, in order theoretical guidance the molecular design of the materials. Influencing factors such as the structures of backbone, species of spacers, etc. are summarized, for the of structure–phase transitionSide behavior relationship
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