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首页> 外文期刊>RSC Advances >Star-like polymer click-functionalized with small capping molecules: an initial investigation into properties and improving solubility in liquid crystals
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Star-like polymer click-functionalized with small capping molecules: an initial investigation into properties and improving solubility in liquid crystals

机译：单击型功能化的星形聚合物，带有小的封端分子：初步研究性质并改善液晶的溶解度

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摘要

A novel class of polymer, star-like poly(tert-butyl acrylate) (PtBA) capped with 4-isocyano-4'-(prop-2-yn-1-yloxy) biphenyl (CNBP), with a well-defined size was synthesized via atom transfer radical polymerization (ATRP) and click reaction (i.e., azide-alkyne cyclization). The star-like architecture was composed of 21 separate arms connected to a high-functionality beta-cyclodextrin (beta-CD) core. The inner star-like PtBA blocks were hydrolyzed into poly(acrylic acid) (PAA), yielding star-like CNBP-capped PAA (i.e., star-like PAA-CNBP). The starlike polymers were characterized by gel permeation chromatography (GPC) and dynamic light scattering (DLS) to confirm narrow size distribution, as well as being examined by proton nuclear magnetic resonance (H-1-NMR), Fourier transform infrared spectroscopy (FTIR), Raman, and atomic force microscopy (AFM) to verify successful attachment of the click-functionalized capping agent (i.e., CNBP) with structural similarity to low molar mass liquid crystal, 4-cyano-4'-pentylbiphenyl (5CB). Structure and phase behavior were evaluated by AFM and optical imaging. Star-like PAA-CNBP was found to possess improved solubility in a liquid crystal host and interesting surface structures.
机译：一类新型的，星形的聚丙烯酸叔丁酯（PtBA），具有4-异氰基-4'-（prop-2-yn-1-yloxy）联苯（CNBP）封端的大小明确通过原子转移自由基聚合（ATRP）和点击反应（即叠氮化物-炔烃环化）合成。星形结构由连接到高功能性β-环糊精（β-CD）核心的21个独立臂组成。将内部星形PtBA嵌段水解成聚丙烯酸（PAA），得到星形CNBP封端的PAA（即星形PAA-CNBP）。通过凝胶渗透色谱（GPC）和动态光散射（DLS）对星形聚合物进行表征，以确认窄尺寸分布，并通过质子核磁共振（H-1-NMR），傅立叶变换红外光谱（FTIR）对其进行检查。 ，拉曼光谱和原子力显微镜（AFM）来验证点击功能化的封端剂（即CNBP）与低摩尔质量液晶4-氰基-4'-戊基联苯（5CB）的结构相似是否成功。通过原子力显微镜和光学成像评估结构和相行为。发现星形PAA-CNBP在液晶主体中具有改善的溶解度和有趣的表面结构。

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