
热致液晶
The development of lyophilic liquid crystal polymer has stimulated the development of thermotropic liquid crystal polymer.
亲液性液晶聚合物的发展刺激着热致性液晶聚合物的发展。
A series of thermotropic liquid crystal aromatic copolyesters with different length of flexible chain spacer have been investigated by FTIR.
本文用富里叶红外光谱方法研究了一系列柔性间隔链段长度不等的芳香共聚酯热致性液晶高分子。
The results demonstrate that this novel polyamide has an obvious liquid crystalline behavior when being heated into molten state, and is a typical kind of thermotropic liquid crystal.
结果表明,该聚酰胺在熔融状态下具有明显的液晶态结构,属于典型的主链型热致液晶。
Thermotropic liquid crystal plastics (LCP) are high performance engineering resins commercially produced abroad in1980's.
热致性液晶塑料是国外八十年代工业化的一类高性能工程塑料。
Glass fiber and whiskers as well as thermotropic liquid crystal polymer may achieve remarkable reinforcement.
PA增强机理包括能量转移理论和交联理论, 玻璃纤维、 晶须对PA的增强效果明显。
Their thermotropic liquid crystal properties were stu***d with polarizing optical microscopy and differential scanning calorimetry.
通过偏光显微镜和差视扫描量热法对这些化合物的热致液晶性进行了研究。
The thermotropic liquid crystal properties were stu***d through polarizing optical microscopy (POM) and differential scanning calorimetry (DSC).
化合物热致液晶性通过偏光显微镜(POM)和差示扫描量热法(DSC)研究。
In-situ composites, consisting of reinforcing thermotropic liquid crystal polymers and thermoplastic matrix, are reviewed together with their preparation, structure and properties.
综述了由增强性的热致液晶高聚物和热塑料聚合物基体组成的原位复合材料及其制备、构和性能。
Characteristics of thermotropic liquid crystal polymers used as high-performance moulded products are commented.
评价了热致液晶高聚物作为高性能成型材料的特点。
It reviewed epoxy toughened by resin alloy, and discussed several new technologies of toughening epoxy such as modified by thermoplastic resin, thermotropic liquid crystal polymer and IPN.
综述了环氧树脂的树脂合金化增韧改性,着重讨论了热塑性树脂、热致液晶聚合物和互穿网络结构等环氧树脂增韧改性新技术。
The results showed that PPC was a thermotropic liquid crystal and displayed the cholesteric banded texture.
结果表明,产物PPC具有明显的热致液晶性能,且呈现出胆甾型液晶的彩色条纹织构;
The results showed that the polymer is a thermotropic liquid crystal and appeared of nematic and smectic texture.
结果表明,该聚合物为热致液晶,能够呈现近晶相和向列相织构。
Liquid crystal polymers include thermotropic liquid crystal polymer (TLCP) and lyotropic liquid crystal (LLCP).
液晶高分子分为热致性液晶聚合物(TLCP)和溶致性液晶聚合物(LLCP)两种。
Oxygen enriching membranes are first prepared from room temperature thermotropic cholesteric liquid crystal and ethyl cellulose.
首创了室温热致胆甾液晶与乙基纤维素共混富氧膜。
The results show that the monomer has thermotropic, all the copolymers have nematic thermotropic liquid polymers and liquid crystal phase with broad temperature ranges.
所有的共聚物均为向列型热致液晶高分子和具有较宽的液晶态温度范围;
The results show that the monomer has thermotropic, all the copolymers have nematic thermotropic liquid polymers and liquid crystal phase with broad temperature ra…
所有的共聚物均为向列型热致液晶高分子和具有较宽的液晶态温度范围;
The results show that the monomer has thermotropic, all the copolymers have nematic thermotropic liquid polymers and liquid crystal phase with broad te…
所有的共聚物均为向列型热致液晶高分子和具有较宽的液晶态温度范围;
热致液晶(Thermotropic Liquid Crystal) 指一类由温度变化直接驱动相变的液晶材料。其分子排列状态(液晶相)在特定温度范围内形成,既具有液体的流动性,又具备晶体般的光学各向异性特性。以下是详细解释:
热致液晶的分子结构通常为刚性棒状或盘状,当温度升高至熔点(( T_m ))时,固态晶体熔解为浑浊的液晶态;继续升温至清亮点(( T_i ))时,则转变为各向同性的透明液体。这一过程可逆,温度降低时分子重新有序排列(来源:剑桥大学材料科学系公开课程)。
温度依赖性
液晶相的存在严格依赖于温度区间。例如,5CB(4-戊基-4'-氰基联苯)在24°C–35°C呈向列相液晶态,超出此范围则变为固体或普通液体(来源:美国化学会ACS Materials期刊)。
分子排列有序性
根据对称性差异,热致液晶可分为:
热致液晶是液晶显示器(LCD)的核心材料。其电光响应特性(如电场下分子取向改变)被用于像素控制。此外,在温度传感器、光学调制器件中也有重要应用(来源:IEEE显示技术期刊)。
不同于依赖溶剂浓度的溶致液晶(如肥皂水),热致液晶的相变仅由温度控制,且分子通常为单一化合物或共熔混合物(来源:剑桥大学材料科学系)。
术语解析:
“Thermotropic liquid crystal”(热致液晶)是一种在特定温度范围内呈现液晶态的物质,其特性介于固态晶体与液态之间。以下是详细解释:
基本定义与特性
热致液晶由单一化合物或少数化合物混合物形成,仅在特定温度区间内表现出液晶相。它兼具液体的流动性和晶体的各向异性,例如分子沿特定方向有序排列,导致光学、电学性质的各向异性。
分类与对比
合成与应用
通过熔融缩聚法可合成热致液晶共聚酯(如含PET的共聚酯),用于增强材料性能。例如,作为增强纤维改善热塑性塑料的机械强度,或用于环氧树脂增韧。
物理化学性质
具有双折射、电光效应等特性,可通过外场(热、电、磁)调控分子排列,适用于显示技术、传感器等领域。
热致液晶是温度敏感型功能材料,其独特的相变行为与可调控性质使其在工程塑料、光电设备等领域有重要应用。
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