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• W2186593949 abstract "A wide variety of thermotropic polyesters have been reported in the past 25 years due to their inherently high stiffness and strength, high use temperatures, excellent chemical resistance and low melt viscosity [1]. However, they generally have a high melting transition temperature, which prevents melt processing before thermal degradation [2,3]. There are several synthetic strategies that reduce the melting temperatures of rigid-rod polymers and yet form liquid crystal phases [4]. For application purpose, it is important to control the melting temperature and other thermal transition properties, which can be accomplished by introducing flexible alkyl spacers in regular rigid main chains [5,6]. In order to lower these transition temperatures without destroying thermotropic behaviour, the approachethat has been adopted is the use of substituted aromatic rings. The melting temperature can be reduced by using derivatives with bulky lateral substituents or flexible side chains on hydroquinone ring [7,8]. Alternatively, a successful approach in decreasing the Tm value of aromatic polyesters is random copolymerization. It is widely used as a versatile process to prepare tailor-made liquid crystalline polymers (LCPs), providing novel materials for fundamental and applied research [9,10]. The synthesis and characterization of methyl-, bromo-, chloro-, phenyland methoxysubstituted hydroquinone containing polymers were reported [7,11]. Introduction of phenyl substituents on the hydroquinone ring was found to lower the transition temperature compared to substituents such as methyl or methoxy [12]. It was also concluded that halogen, alkyl, or phenyl substituents on one or both of the aromatic rings result in the lowering of transition temperatures. Subsequently, the effect of alkoxy substituents on the hydroquinone ring was studied and an exponential decrease in the melting temperature with the increase in the length of the substituents’ chain was observed. Recently, Jin et al. have reported two series of totally aromatic thermotropic copolyesters containing 2-(α-phenylisopropyl) hydroquinone moiety polyesters [13]. Due to the rigidity of the main chain and presence of the bulky substituents on the hydroquinone units, the glass transition temperatures of the polyesters are rather high. The low melting temperatures for melt processing was reported for copolyesters. According to Bashir et al. [7] the aromatic copolyesters of terephthalic acid with mono and symmetrically di-substituted hydroquinone form liquid crystalline melts and have isotropization temperature which is not observed for homopolyesters. In this work, we have examined the synthesis and phase behaviour of a liquid crystalline polyester containing 2,5-bis(4-hexyloxybenzoyloxy) hydroquinone moieties in main chain. This homopolyester PHQ6 and its copolyester consisting of HQ6 monomer and triad aromatic ester type mesogenic unit H6 (PHQ6-co-PH6; 1:1 mol/mol) were prepared through solution polycodensation. The purpose of this study was to investigate the effect of the rigid lateral moiety on the thermal and liquid crystalline (LC) properties of the polyesters." @default.
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• W2186593949 date "2006-01-01" @default.
• W2186593949 modified "2023-09-24" @default.
• W2186593949 title "Synthesis and Characterization of Main Chain Liquid Crystalline Polyesters Containing 2,5-Bis(4-hexyloxybenzoyloxy)hydroquinone and Terephthalate Units" @default.
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