含芳酯键双马来酰亚胺的合成与液晶行为

本文合成了含芳酯键的双马来酰亚胺及其与二苯醚二胺的共聚物。应用ＦＴＩＲ，Ｈ－ＮＭＲ，ＤＴＡ，ＤＳＣ，热台偏光显微镜，Ｘ－射线衍射研究了该类双马来酰亚胺的结构，热性能和热致液晶行为。研究表明：热固性聚合物的液晶行为随反应程度或交联密度的增大而增强，而且液晶特征能够保留在交联网络中，形成液晶聚合物网络材料。     

侧链液晶聚硅氧烷的合成及性能

介绍了带有性侧链液晶基团的聚硅氧烷的合成，系统论述了其链结构，取代度和相对分子质量与液晶相变温度，液晶相态温度范围，液晶态结构等之间的关系。铡链液晶聚硅 显著而稳定的热致液晶性，其液晶相态温度范围可宽至３０７℃，且可获得少见的柱状相液晶，其广角Ｘ射线衍射谱图在０．４３－０．４７ｎｍ和１．９６－３．３１ｎｍ处出现２个特征峰。     

液晶双马来酰亚胺/环氧树脂共聚物的制备

本文采用含柔性链（C10）的液晶双马来酰亚胺和含联苯基的液晶环氧树脂合成共聚物，经FTIR、DSC、偏光显微镜、SEM表征了该共聚物的结构与液晶特征。结果表明该共聚物具有较好热致液晶性，其液晶织态呈向列型织构，亦能保留在交联网络结构中。     

BHET-PHB热致液晶聚合物的合成及表征

以对苯二甲酸乙二醇酯（BHET）和对羟基苯甲酸（PHB）为原料，采用熔融缩聚法合成了BHET－PHB热致液晶共聚酯。合成的共聚酯化学结构通过红外和核磁来验证，并用DSC、偏光显微镜和X射线衍射研究了其液晶行为，证明BHET－PHB共聚酯为典型的向列型液晶。     

腈纶氧化过程的结构变化(英文)

采用小角Ｘ散射（ＳＡＸＳ），广角Ｘ衍射（ＷＡＸＤ），差热扫描量热（ＤＳＣ），热机械性能测试（ＴＭＡ）等试验手段，研究了聚丙烯腈（ＰＡＮ）纤维从２０～３００℃，松弛及张紧状态下的结构变化，根据实验结果，提出了一个两相结构模型。     

热致性液晶聚氨酯的合成研究

合成了两种含聚酯液晶基元的液晶聚氨酯,研究了反应时间、不同原料对产物结构的影响,利用红外光谱（IR）、偏光显微镜（POM）、差示扫描量热分析仪（DSC）等手段确认其结构,正交偏光场观察证实,该液晶聚氨酯在一定温度范围内为热致性向列型液晶。     

热致液晶共聚酯PET／60PHB的合成及性能研究

通过研究影响ＰＥＴ／６０ＰＨＢ对数比浓粘度的诸多因素，确定了缩聚反应的最佳工艺条件，并在该下合成了对数比浓粘度达０．７以上的ＰＥＴ／６０ＰＨＢ共聚酯，用ＮＭＲ，ＩＲ，ＰＯＭ，ＤＳＣ，ＷＡＸＤ和流变学等方法对其结构和液晶性进行了研究和分析，结果表明，合成的聚合物ＰＥＴ／６０ＰＨＢ（ＹＳＴＬ－１）确系ＰＥＴ与ＰＨＢ的无规共聚酯，属向列相热致液晶，加工试验表明，该共聚酯具有优良的加工流动性，其力学性能，     

PET／PHB共聚酯的液晶性及相转变的研究

本文用偏光显微镜、红外光谱（ＦＴＩＲ），示差扫描量热仪（ＤＳＣ）等先进仪器研究了各种组成的ＰＥＴ／ＰＨＢ共聚酯的液晶性能及热转变特性，研究结果表明，当ＰＨＢ％大于３０ｍｏｌ％时开始出现向列热致液晶性。共聚酯均表现出多重相转变特征，这与不同程度的ＰＥＴ富微区和ＰＨＢ富微区有关。     

主链液晶聚硅（氧）烷的液晶行为

综述了主链液晶聚硅烷和主链液晶聚硅氧烷（包括线型、环型和梯形结构）的热致和溶致液晶行为，指出主链液晶聚硅（氧）烷具有较稳定的热致液性能，其液晶相态温度范围最宽可达３７５℃，且多数在室温下 柱状液晶相态。带有表面活性苈团例链的线型聚硅烷以水为溶剂时，可形成溶致液晶，其呈现液晶行为的临界浓度约为３０％。液晶聚硅（氧）烷所具有的液晶行为膜使其成为一种新型的功能性硅橡胶。     

硼泥性能的研究

本文研究了工业废料──硼泥的性能。利用Ｘ射线衍射（ＸＲＤ）、扫描电子显微镜分析（ＳＥＭ）及能谱分析（ＥＤＳ）等手段研究了硼泥的组成和结构以及硼泥在加热过程中的变化，为开发利用硼泥这个巨大的二次资源奠定了基础。     

液晶热性能的研究

讨论了液晶聚合物及相应的液晶单体的热性能,指出液晶聚合物的液晶温度区间总量宽于液晶单体。通常在侧链液晶聚合物中第二种单体的引 导致液晶温度区间变宽。     

新型液晶离聚物研究进展

液晶离聚物是一种具有液晶聚合物和离子聚合物双重特性的一类高聚物.液晶离聚物不仅显示溶致和/或热致液晶性,而且具有一些特殊的功能性.本文基于国内外最新研究文献,论述近年来合成的五类液晶离聚物的液晶行为及应用前景.     

热致液晶聚合物共混改性PC的研究进展

综述了近几年来热致性液晶聚合物(TLCP)与聚碳酸酯(PC)共混改性方面的研究进展，以及TLCP的加入对PC的熔融和结晶行为、粘度、形态结构以及力学性能的影响，并阐述了增容技术在共混改性中的重要性。     

Liquid crystalline polymers having dimetric moieties as side chains

A new series of liquid crystalline polymers having dimetric moieties as side chains were synthesized. The polymers exhibited nematic and smectic A phases depending on the length and parity of the flexible spacers. As the length of the flexible spacer was varied, the nematic–isotropic transition temperature and the entropy change associated with the transition exhibited a remarkable odd–even effect, in which the even numbers exhibited higher values. The transition properties were compared with those of known liquid crystalline polymers and liquid crystal dimers. The dimetric moieties effectively affected the transition properties of the present polymers, and the odd–even effect was significantly greater than that of the known polymers.     

Liquid crystalline poly(enamine ketone)s formed through hydrogen bonding

A series of poly(enamine ketone)s (PEAKs) which exhibit liquid crystalline phases has been synthesized. The enamine ketone groups are able to exist in the cis and trans conformations. Molecular modelling results show that the cis conformation is energetically more favorable due to intramolecular hydrogen bonding. Model compound studies indicate that the formation of the mesogen requires the cis conformation in the enamine ketones to stabilize the liquid crystalline phase. This liquid crystalline phase is nematic for the model compound and the polymers. The heats of liquid crystal transition in the model compound and in PEAKs are very close (4.7 kJ/mol in model compound and 4.0 kJ/mol of repeating units in polymers). This is not only an indication of a similar percentage of the cis conformation in both cases, but also an example that the flexible ethyleneoxy spacers in the polymers do not contribute to the orientational order of this liquid crystalline phase. PEAKs can crystallize through either quenching from the isotropic melt or from the liquid crystalline phase. Crystallization kinetics exhibit the effect of pre-ordering when these two different kinetics are compared.     

Self‐Assembly and Adjustable Ion Conducting Behavior of Graphene Oxide Liquid Crystalline Network Membranes

Self‐assembly of graphene oxide liquid crystalline network (GO‐LCNs) membranes is constructed for the first time via Langmuir–Blodgett assembly technique. The GO‐LCNs are synthesized by hydrogen‐bonded self‐assembly between carboxyl groups on graphene oxide and pyridinyl groups on liquid crystalline polymers. These GO‐LCNs membranes possess distinct microstructures and show adjustable ion conducting behavior due to GO planar structure induced by mesogen oriention of liquid crystal molecules. The liquid crystalline behavior of the GO‐LCNs is identified by combining polarized optical microscopy, differential scanning calorimetry, and X‐ray diffraction measurements. The liquid crystalline properties of GO‐LCNs are adjusted by the composition of the liquid‐crystalline polymers. The microstructures and ion conducting behavior of GO‐LCNs membranes are investigated by applying different electromagnetic field, which are identified by different ionic conductivity of lithium bis(trifluoromethanesulphonyl)imide organic solution passed through the membranes. Ionic conductivity of solutions is increased nearly 100‐fold and tenfold for an orientated GO‐LCNs membrane. These GO‐LCNs are promising materials in numerous applications such as high‐performance electrode material, ion battery materials, proton conductors, and so on.     

Synthesis and characterization of optically active liquid crystalline polyacrylates containing mesogenic phenylbenzoate groups

A series of novel side chain liquid crystalline polyacrylates with pendant chiral groups were synthesized. It was found that monomers with electron releasing -OC₄H₉ terminal groups seem beneficial for the formation of liquid crystalline phases. Copolymerization of the monomers was carried out and the physical properties of the copolymers were investigated. All synthesized polymers revealed liquid crystalline phases and appeared highly thermally stable with decomposition temperatures (T_d) at 10% weight loss greater than 384 °C and about 50% weight loss occurred beyond 442 °C under nitrogen atmosphere. Two miscible chiral compounds were also synthesized and used as chiral dopants to induce cholesteric liquid crystalline phases of polymers. Liquid crystalline phases of the polymers were investigated using DSC and XRD, and confirmed with POM technique. The optical properties of the induced cholesteric liquid crystalline polymers were investigated using UV-vis spectrometer. The appearance and the color variation of the polymer films before and after UV irradiation were also investigated. Typical helical morphology of the cholesteric liquid crystalline film was analyzed by SEM technique.     

界面缩聚法制备主链液晶离聚物及其表征

采用界面缩聚的方法,以异山梨醇为刚性基元、柔性基元癸二酰氯、离子基元灿烂黄为主要原料,合成了热致性主链液晶离聚物.通过傅立叶转换红外光谱(FT-IR))对其结构进行了表征,采用偏光显微镜(POM)、示差扫描量热仪(DSC)和广角X射线(X-ray)等手段对其液晶性能进行了表征.结果表明:该离聚物为近晶A型热致液晶,随着离子基元的加入及含量的变化对液晶性和液晶类型都没有影响.     

含热致液晶高分子的共混体系的粘度与形态结构

综述了含热致液晶高分子的高聚物共混材料粘度与组成的关系,分析了影响共混物形态结构特别是纤维状液晶分散相形成的各种因素。     

Liquid crystal polyarylates containing 2,6-naphthalene dicarbonyl group (I): Effects of kinky monomers on thermal and anisotropic behaviors

A series of copolyarylates primarily based upon 2,6-naphthalene dicarboxylic acid, hydroxybenzoic acid and 4,4-biphenol were prepared by slurry-melt polymerization with Santotherm 66 as a heat exchange medium. The frequently used kinky monomer, resorcinol or isophthalic acid, was introduced into these copolyarylates to modify the chemical strcture. The relationship of the thermal behavior and the crystalline structures for these copolymers was studied by means of DSC and wide angle X-rays diffraction. The amount of mcorporated kinky modifier was found to produce a significant effect on the liquid crystalline phase and the melting temperature of the copolyarylates. All of these liquid crystal polymers exhibited nematic textures; shreaded and/or Schlieren type, depending upon the incorporated kinky monomer. The liquid crystal polymers modified by isophthalic acid (up to 40 mole % of 2,6-naphthalene dicarboxylic acid replaced by isophthalic acid) possessed shreaded texture however high the temperatures of the polymer melts were. The liquid crystal polymers modified by resorcinol (60 to 100 mole % of 4, 4-biphenol replaced by resorcinol), however, would have two types of nematic textures: the shreaded texture occurred when the temperature of the polymer melt was between the melting temperature and the anisotropic transition temperature; the Schlieren texture existed when the temperature of the polymer melt was high above the anisotropic transition temperature. The Schlieren texture formed only when a liquid crystal polymer revealed good flowability and lower rigidity. The polydomain concepts could be utilized to explain the observed textures of these copolyarylates clearly.