
熱緻液晶
The development of lyophilic liquid crystal polymer has stimulated the development of thermotropic liquid crystal polymer.
親液性液晶聚合物的發展刺激着熱緻性液晶聚合物的發展。
A series of thermotropic liquid crystal aromatic copolyesters with different length of flexible chain spacer have been investigated by FTIR.
本文用富裡葉紅外光譜方法研究了一系列柔性間隔鍊段長度不等的芳香共聚酯熱緻性液晶高分子。
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.
結果表明,該聚酰胺在熔融狀态下具有明顯的液晶态結構,屬于典型的主鍊型熱緻液晶。
Thermotropic liquid crystal plastics (LCP) are high performance engineering resins commercially produced abroad in1980's.
熱緻性液晶塑料是國外八十年代工業化的一類高性能工程塑料。
Glass fiber and whiskers as well as thermotropic liquid crystal polymer may achieve remarkable reinforcement.
PA增強機理包括能量轉移理論和交聯理論, 玻璃纖維、 晶須對PA的增強效果明顯。
Their thermotropic liquid crystal properties were stu***d with polarizing optical microscopy and differential scanning calorimetry.
通過偏光顯微鏡和差視掃描量熱法對這些化合物的熱緻液晶性進行了研究。
The thermotropic liquid crystal properties were stu***d through polarizing optical microscopy (POM) and differential scanning calorimetry (DSC).
化合物熱緻液晶性通過偏光顯微鏡(POM)和差示掃描量熱法(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.
綜述了由增強性的熱緻液晶高聚物和熱塑料聚合物基體組成的原位複合材料及其制備、構和性能。
Characteristics of thermotropic liquid crystal polymers used as high-performance moulded products are commented.
評價了熱緻液晶高聚物作為高性能成型材料的特點。
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.
綜述了環氧樹脂的樹脂合金化增韌改性,着重讨論了熱塑性樹脂、熱緻液晶聚合物和互穿網絡結構等環氧樹脂增韌改性新技術。
The results showed that PPC was a thermotropic liquid crystal and displayed the cholesteric banded texture.
結果表明,産物PPC具有明顯的熱緻液晶性能,且呈現出膽甾型液晶的彩色條紋織構;
The results showed that the polymer is a thermotropic liquid crystal and appeared of nematic and smectic texture.
結果表明,該聚合物為熱緻液晶,能夠呈現近晶相和向列相織構。
Liquid crystal polymers include thermotropic liquid crystal polymer (TLCP) and lyotropic liquid crystal (LLCP).
液晶高分子分為熱緻性液晶聚合物(TLCP)和溶緻性液晶聚合物(LLCP)兩種。
Oxygen enriching membranes are first prepared from room temperature thermotropic cholesteric liquid crystal and ethyl cellulose.
首創了室溫熱緻膽甾液晶與乙基纖維素共混富氧膜。
The results show that the monomer has thermotropic, all the copolymers have nematic thermotropic liquid polymers and liquid crystal phase with broad temperature ranges.
所有的共聚物均為向列型熱緻液晶高分子和具有較寬的液晶态溫度範圍;
The results show that the monomer has thermotropic, all the copolymers have nematic thermotropic liquid polymers and liquid crystal phase with broad temperature ra…
所有的共聚物均為向列型熱緻液晶高分子和具有較寬的液晶态溫度範圍;
The results show that the monomer has thermotropic, all the copolymers have nematic thermotropic liquid polymers and liquid crystal phase with broad te…
所有的共聚物均為向列型熱緻液晶高分子和具有較寬的液晶态溫度範圍;
熱緻液晶(Thermotropic Liquid Crystal) 指一類由溫度變化直接驅動相變的液晶材料。其分子排列狀态(液晶相)在特定溫度範圍内形成,既具有液體的流動性,又具備晶體般的光學各向異性特性。以下是詳細解釋:
熱緻液晶的分子結構通常為剛性棒狀或盤狀,當溫度升高至熔點(( T_m ))時,固态晶體熔解為渾濁的液晶态;繼續升溫至清亮點(( T_i ))時,則轉變為各向同性的透明液體。這一過程可逆,溫度降低時分子重新有序排列(來源:劍橋大學材料科學系公開課程)。
溫度依賴性
液晶相的存在嚴格依賴于溫度區間。例如,5CB(4-戊基-4'-氰基聯苯)在24°C–35°C呈向列相液晶态,超出此範圍則變為固體或普通液體(來源:美國化學會ACS Materials期刊)。
分子排列有序性
根據對稱性差異,熱緻液晶可分為:
熱緻液晶是液晶顯示器(LCD)的核心材料。其電光響應特性(如電場下分子取向改變)被用于像素控制。此外,在溫度傳感器、光學調制器件中也有重要應用(來源:IEEE顯示技術期刊)。
不同于依賴溶劑濃度的溶緻液晶(如肥皂水),熱緻液晶的相變僅由溫度控制,且分子通常為單一化合物或共熔混合物(來源:劍橋大學材料科學系)。
術語解析:
“Thermotropic liquid crystal”(熱緻液晶)是一種在特定溫度範圍内呈現液晶态的物質,其特性介于固态晶體與液态之間。以下是詳細解釋:
基本定義與特性
熱緻液晶由單一化合物或少數化合物混合物形成,僅在特定溫度區間内表現出液晶相。它兼具液體的流動性和晶體的各向異性,例如分子沿特定方向有序排列,導緻光學、電學性質的各向異性。
分類與對比
合成與應用
通過熔融縮聚法可合成熱緻液晶共聚酯(如含PET的共聚酯),用于增強材料性能。例如,作為增強纖維改善熱塑性塑料的機械強度,或用于環氧樹脂增韌。
物理化學性質
具有雙折射、電光效應等特性,可通過外場(熱、電、磁)調控分子排列,適用于顯示技術、傳感器等領域。
熱緻液晶是溫度敏感型功能材料,其獨特的相變行為與可調控性質使其在工程塑料、光電設備等領域有重要應用。
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