在本文中,我们报告了由铑 (I) 和铂 (II) 的配合物介导的脂肪族尾部末端碳-碳双键液晶化合物的氢化硅烷化的合成和研究。合成了基于对苯二酰-双-4-羟基苯甲酸酯在脂肪族尾部具有末端碳-碳双键的新型液晶化合物。极性和光可极化片段的脂肪族尾部的引入导致产生介晶形成能力的化合物的降低。由铑 (I) 和铂 (II) 络合物介导的具有脂肪族尾部碳碳双键的液晶化合物与 1-(1'-芳基乙氧基)-1,1,3,3-四甲基二硅氧烷的氢化硅烷化反应为调查。这些条件下的主要过程是烯烃片段的异构化。
From cyclohexanone to photosensitive polyesters: Synthetic pathway, basic characterization, and photo-/halochromic properties
作者:Mihaela Homocianu、Diana Serbezeanu、Ana Maria Macsim、Tǎchitǎ Vlad-Bubulac
DOI:10.1016/j.molliq.2020.113888
日期:2020.10
condensation reaction of cyclohexanone with p-hydroxybenzaldehyde in the presence of hydrochloric acid, as a catalyst. Based on DHCH, a series of new photosensitive polyesters were prepared by a polycondensation reaction, in solution, using two phosphonic dichlorides, namely, phenylphosphonic dichloride and phenyl dichlorophosphate, or two aromatic dichlorides, namely, terephthaloyl chloride and terep
由二醇制得了一系列新型的含磷聚酯酰亚胺,这是一种新型的含芳族磷双酚的混合物,即1,4-双[ N-(4-羟基苯基)邻苯二甲酰亚胺-5-羧酸盐] -2-(6-氧化-6H-二苯并 <1,2>氧磷膦-6-基)-萘,脂肪族二醇,例如1,3-丙二醇,1,4-丁二醇,1,5-戊二醇,1,6 -己二醇和1,12-十二烷二醇-以及含有两个预先形成的酯基的芳族二酰氯,即对苯二甲酰-双(4-氧代苯甲酰氯),是通过邻二氯苯中的高温缩聚反应制得的。单体和聚合物的结构通过傅立叶变换红外(FTIR)光谱和11 H NMR光谱。改变芳香族双酚与脂肪族二醇的摩尔比可生成一系列具有特定理化性质的共聚酯酰亚胺,并建立了结构-性质关系。通过热重分析(TGA),TGA-FTIR和扫描电子显微镜评估了磷含量对热性能和阻燃性的影响。该聚合物在高达340°C的温度下均保持稳定,在340–395°C的范围内出现5%的重量损失,在370–4
Properties of Thermotropic Liquid Crystalline Polyester Nanocomposites Derived from Multi-Walled Carbon Nanotubes
作者:Wen-Feng Zhao、Ji-Xin Liu、Zhen-Kai Cui、Wu-Quan Hu、Jian Jiang、Shi-Jun Da、Rong Li
DOI:10.1166/jnn.2011.4135
日期:2011.6.1
A series of nanocomposites containing multi-walled carbon nanotubes (MWNTs) and terephthaloyl-di-p-oxybenzoyl chloride-triethylene glycol copolyester (T–T) were prepared by in-situ hightemperature solution polycondensation. The liquid crystalline properties and thermal stability of the resulted MWNTs/T–T nanocomposites were investigated by wide-angle X-ray diffraction (WAXD), polarized optical microscopy (POM), differential scanning calorimetry (DSC), and thermogravimetric analyzer (TGA), respectively. The results showed that MWNT doping at a low concentration improved the thermal stability of T–T matrix and expanded the nematic temperature range without largely changing its conformation, making it more suitable for processing. The dispersion of MWNTs and interfacial interactions between the thermotropic liquid crystalline polymer (TLCP) molecules and the carbon nanotubes (CNTs) were investigated by scanning electron microscopy (SEM) and optical spectroscopies. The UV-vis spectroscopy and fluorescence spectra supported a strong π–π* interaction between the polymer and the nanotube.
Sava, Ion; Iosip, Mariana-Dana; Bruma, Maria, Revue Roumaine de Chimie, 2004, vol. 49, # 6, p. 515 - 523
作者:Sava, Ion、Iosip, Mariana-Dana、Bruma, Maria
DOI:——
日期:——
Callimatic and T-shaped liquid crystalline compounds with fluorinated terminal groups
作者:V. V. Zuev
DOI:10.1134/s1070363208090119
日期:2008.9
A series of liquid crystalline polyesters with a rigid T-shaped or a stick-like mesogenic fragment and fluorinated terminal groups of various structures was synthesized and studied by means of polarization optical microscopy, differential scanning calorimetry, and IR and H-1 NMR spectroscopy. It was shown that the effect of the fluorinated group on the thermostability of the mesophase depends on the shape of the mesogenic fragment. The thermostability of the mesophase in callimatic liquid crystalline compounds with perfluorinated terminal groups is higher and in those with difluoromethyl terminal groups containing one hydrogen atom is lower compared with their alkyl analogs. This is connected with the possibility of weak hydrogen bonding that destroys the liquid crystalline order. The thermostability of the mesophase in compounds with a T-shaped mesogenic fragment and any fluorinated terminal groups is always higher compared with their alkyl analogs.