首页> 外文期刊>Liquid Crystals: An International Journal in the Field of Anisotropic Fluids >Direct synthesis of potentially biodegradable aromatic-aliphatic thermotropic copolyesters with photocrosslinking properties
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Direct synthesis of potentially biodegradable aromatic-aliphatic thermotropic copolyesters with photocrosslinking properties

机译:直接合成具有光关键特性的潜在可生物降解的芳香族 - 脂族热辐射共聚酯

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摘要

In this study, aromatic-aliphatic thermotropic copolyesters derived from p-hydroxybenzoic acid, p-hydroxycinnamic acid (HCA), terephthalic acid and polyethylene glycol (PEG) with different molecular weight (200, 400, 600) were directly synthesised via Vilsmeier adduct solution polymerisation method. The structure, thermal behaviour, liquid crystal property, hydrophylicity and photoactivity were investigated by Fourier transform infrared and nuclear magnetic resonance spectroscopy, differential scanning calorimeter, polarised optical microscopy, water contact angle measurement and ultraviolet (UV) spectrophotometer. The PEG incorporation ratio is 0.540-0.691 related to the HCA units, because of its low reactivity. And, the copolyesters have relatively low melting temperatures (96-107 degrees C) and good hydrophylicity (water contact angle value 61.2-75.3 degrees) as compared with wholly aromatic thermotropic copolyester. All of the copolyesters exhibited nematic liquid crystal behaviour and the stable mesophase temperature range was more than 60 degrees C after being melted. The resulted copolyesters had enough thermal stability for melt processing without any degradation. The UV absorption intensities decreased with increased irradiation time, indicating that photocrosslinking occurred.
机译:在该研究中,通过Vilsmeier加合溶液直接合成衍生自p-羟基苯甲酸,对羟基苯甲酸(200,400,600)的芳族脂族热竞争共聚酯,对苯二甲酸和聚乙二醇(PEG),直接合成不同分子量(200,400,600)聚合方法。通过傅里叶变换红外和核磁共振光谱,差示光学显微镜,偏振光显微镜,水接触角测量和紫外(UV)分光光度计研究了结构,热行为,液晶性能,疏水性和液晶性能,疏水性和光接活性。 PEG掺入率为0.540-0.691与HCA单位有关,因为其反应性低。并且,与全芳族热致热共聚酯相比,共聚酯具有相对低的熔化温度(96-107摄氏度)和良好的疏水性(水接触角度值61.2-75.3度)。所有共聚酯在熔化后表现出甲型液晶行为,稳定的中间相温度范围大于60℃。所得到的共聚酯对于熔融加工具有足够的热稳定性而不会进行任何降解。紫外线吸收强度随着照射时间的增加而降低,表明了光敏性发生。

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