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Synthesis and characterization of polyurethane-based side-chain cholesteric liquid crystal polymers

机译：聚氨酯基侧链胆甾型液晶聚合物的合成与表征

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Polyurethane-based side-chain cholesteric liquid crystalline polymers (ChLCPs) with variable clearing temperatures were synthesized in a two-step reaction. The chemical structures of ChLCPs were confirmed by FT-IR and 1H-NMR spectroscopy. The mesogenic properties and phase transition behavior were investigated by means of differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction measurements. The DSC studies show that the melting temperature and isotropic transition temperature of the ChLCPs increased with the weight percentage of cholesterol in the polymer. POM shows that the ChLCPs had a distinct spherulite structure that melted at about 140 °C, and these results are consistent with those of the DSC studies. The thermogravimetric studies show that the ChLCPs were stable up to 200 °C, though there was a reduction in the thermal stability as the weight proportion of cholesterol and glycerol in the polymer increased.
机译：在两步反应中合成了具有可变清除温度的基于聚氨酯的侧链胆甾型液晶聚合物（ChLCP）。 ChLCPs的化学结构通过FT-IR和1 H-NMR光谱证实。通过差示扫描量热法（DSC），偏振光学显微镜（POM）和X射线衍射测量研究了介晶性质和相变行为。 DSC研究表明，ChLCPs的熔融温度和各向同性转变温度随聚合物中胆固醇的重量百分比而增加。 POM显示ChLCPs具有独特的球晶结构，其熔点约为140°C，这些结果与DSC研究的结果一致。热重研究表明，尽管随着聚合物中胆固醇和甘油的重量比例的增加，热稳定性有所降低，但ChLCP在高达200°C的温度下仍保持稳定。

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