| Synthesis and Properties of Cholesterol-based Liquid Crystal Functionalized SBS Elastomers |
| Received:May 27, 2023 Revised:May 27, 2023 |
| DOI：10.12136/j.issn.1000-890X.2024.12.0883 |
| Key Words: active anionic polymerization；styrene-butadiene-styrene block copolymer；liquid crystal elastomer；molecular weight；liquid crystal texture；thermal property |
| Author Name | Affiliation | E-mail | | YANG Jiaxin* | Dalian University of Technology | 36943470@qq.com | | WANG Bo | Dalian University of Technology | | | MA Hongwei | Dalian University of Technology | | | HAN Li | Dalian University of Technology | | | LI Yang | Dalian University of Technology | |
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| Abstract: |
| Based on the active anionic polymerization method，styrene and butadiene as the copolymerized monomer，silicon tetrachloride as the coupling agent，by sequential loading method and star coupling method，the star styrene-butadiene-styrene block copolymers（SBS） with different number average molecular weights（12.2～66.5 kg·mol-1） and compositions were designed and synthesised，their molecular weight distributions index（PDI） was in the range of 1.03～1.20，in addition，commerciallized linear SBS products with brands SBS-791，SBS-792，SBS-LG （with the number average molecular weights of 91.5～131.1 kg·mol-1 and the PDI of 1.07～1.39） were selected，the designed and synthesized Cholesterol-based liquid crystal monomer with the end of SiH was grafted onto polybutadiene block of the SBS，and the chololesterol-based liquid crystal functionalized SBS elastomers（SBS-LC） with similar structures and grafting densities and different molecular weights and compositions were prepared.The molecular weight and microstructure of the SBS and the SBS-LC were analyzed by gel permeation chromatograph and hydrogen nuclear magnetic resonance instrument with four detectors，the liquid crystal texture and thermal properties of the SBS-LC were analyzed by polariztion microscope and differential scanning calorimeter，and the structure-activity relationship between structure and properties of the SBS-LC was established，which laid the basis for the design and application of the liquid crystal functional polymer materials. |
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