Influence of the Metal Cross-Linking on the Dielectric, Mechanical, and Thermal Properties of a Liquid Crystalline Polyazomethine

IF 5.1 1区化学 Q1 POLYMER SCIENCE Macromolecules Pub Date : 1997-02-24 DOI:10.1021/ma961119o

J. A. Puértolas, E. Carod, R. Díaz-Calleja, P. Cerrada, L. Oriol, M. Piñol, J. L. Serrano

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引用次数: 13

Abstract

Cross-linked polymeric materials have been synthesized by copper(II) complexation of a semiflexible main-chain liquid crystalline polyazomethine. The influence of the copper(II) cross-linking density on the thermal properties has been studied by DSC. The relaxation behavior of both the parent polymer and the complexed polymers has been investigated by dielectric spectroscopy and dynamic mechanical measurements. The parent compound exhibits three relaxations (denoted by α, β, and γ), together with a conductive process at low frequency. The relaxations have been associated with the glass transition (α), rotational motions located in the rigid mesogenic core (β), and local motions of the decamethylene flexible spacer (γ). Semiempirical calculations have been carried out in order to evaluate the rotational energy barriers which can account for the β process. The influence of the degree of cross-linking on the activation energies and on the strength and shape parameters has also been studied in the copper(II)-complexed polymers.

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金属交联对液晶聚亚甲胺介电、力学和热性能的影响

采用铜(II)络合半柔性主链液晶聚亚甲胺合成交联高分子材料。采用DSC研究了铜(II)交联密度对热性能的影响。通过介电光谱和动态力学测量研究了母聚合物和络合聚合物的弛豫行为。母化合物表现出三个弛豫(用α、β和γ表示)，并在低频下发生导电过程。弛豫与玻璃化转变(α)、位于刚性介生核心的旋转运动(β)和十亚甲基柔性间隔层(γ)的局部运动有关。为了评价能解释β过程的旋转能垒，进行了半经验计算。研究了交联程度对铜(II)络合聚合物活化能、强度和形状参数的影响。

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来源期刊

Macromolecules 工程技术-高分子科学

CiteScore

9.30

自引率

16.40%

发文量

942

审稿时长

2 months

期刊介绍： Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.