Side chain liquid crystalline polysiloxane hydroxamic acids and their liquid crystalline behaviour

IF 4.5 3区工程技术 Q1 CHEMISTRY, APPLIED

Reactive & Functional Polymers Pub Date : 2024-07-11 DOI:10.1016/j.reactfunctpolym.2024.106009

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Abstract

The synthesis and properties of side chain polysiloxane hydroxamic acids have been described. The N-p substituted phenyl hydroxamic acids were synthesized by reacting p - allyloxy benzoyl chloride and acryloyloxy sebacoyl chloride with N-arylhydroxylamines in toluene medium, rendered basic with aqueous suspension of sodium bicarbonate at 0 °C or lower. The synthesized N-phenyl substituted hydroxamic acids were attached to poly(methylhydrosiloxane) via hydrosilylation reaction in the presence of platinum catalyst The polysiloxane hydroxamic acids were characterized by melting point, FT – IR, NMR and Mass spectral techniques. The liquid crystalline behaviour of the side chain polysiloxane hydroxamic acids with allyloxy and acryloylsebacoyloxy spacer have been studied by optical.

polansed microscopy and differential scanning calorimetry. Side chain liquid crystalline polysiloxane hydroxamic acids with allyloxy spacer (N-p substituted phenyl p-[(3-polysiloxane propyloxy) benzo] hydroxamic acids, (PHA – 1 to PHA −4) show nematic phases, while the second series with acryloylsebacoyloxy spacer (N-p-substituted phenyl (3-polysiloxane propanone) octyl carbonyloxy hydroxamic acids, (PHA – 5 to PHA – 8) show nematic as well as smectic phases. The liquid crystalline behaviour of the side chain polysiloxane hydroxamic acids with allyloxy and acrylsebacoyloxy spacer have been studied.

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侧链液晶聚硅氧烷羟肟酸及其液晶行为

侧链聚硅氧烷羟肟酸的合成和特性已经得到描述。N-p 取代苯基羟肟酸是通过对-烯丙氧基苯甲酰氯和丙烯酰氧基癸二酰氯与 N-芳基羟胺在甲苯介质中反应合成的。在铂催化剂存在下，通过氢硅烷化反应将合成的 N-苯基羟肟酸连接到聚甲基氢硅氧烷上，并通过熔点、傅立叶变换红外光谱、核磁共振和质谱技术对聚硅氧烷羟肟酸进行表征。通过光学显微镜和差示扫描量热法研究了带有烯丙氧基和丙烯酰-四酰氧基间隔物的侧链聚硅氧烷羟肟酸的液晶特性。带有烯丙氧基间隔物的侧链液晶聚硅氧烷羟肟酸（N-p 取代苯基对[（3-聚硅氧烷丙氧基）苯并]羟肟酸，（PHA - 1 至 PHA - 4）显示出向列相、而带有丙烯酰基链酰氧基间隔物（N-对取代苯基（3-聚硅氧烷丙酮）辛基碳酰氧基羟肟酸）的第二个系列（PHA - 5 至 PHA - 8）则显示出向列相和共晶相。我们还研究了带有烯丙氧基和丙烯酰氧基间隔物的侧链聚硅氧烷羟肟酸的液晶特性。

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来源期刊

Reactive & Functional Polymers 工程技术-高分子科学

CiteScore

8.90

自引率

5.90%

发文量

259

审稿时长

27 days

期刊介绍： Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.