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Thermosets containing benzoxazole units: Liquid-crystalline behavior and thermal conductivity

机译：含有苯并恶唑单元的热固性件：液晶行为和导热率

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摘要

A series of liquid-crystalline (LC) thermosetting monomers containing benzoxazole (BO) units were synthesized to evaluate the thermal conductivities (lambda) of their cured resins. A BO-containing bisnadiimide system showed LC behavior during the heating process. However, the thermal cure of the bisnadiimide provided a film without optical anisotropy; consequently, the cured film exhibited normal levels of thermal diffusivity (alpha) and thermal conductivity (lambda). The disappearance of the optically anisotropic ordered structures during thermal curing is likely related to the temperature gaps between the cure reaction ranges and LC ranges (T-cure-T-LC gap). In addition, epoxy resins consisting of bisepoxides and BO-containing diamines were investigated because of their high flexibility in terms of molecular design that can be used to reduce the T-cure-T-LC gap. The combination of a terephthalylidene-type bisepoxide and BO-containing diamine with a controlled flexible chain length resulted in the smallest T-cure-T-LC gap among the epoxy resin systems examined herein. The cured epoxy resin film exhibited an appreciably increased lambda value (0.257 W m(-1) K-1) in the Z direction. This indicated the importance of the T-cure-T-LC gap for enhancing the alpha and lambda values of the cured films. This epoxy resin system was cured under a continuous DC electric field during polarizing optical microscopy. A prompt response with deformation of the LC domains was observed in harmony with temporal ON/OFF switching of the DC power supply. As expected, the cured film exhibited a significantly enhanced lambda value (0.488 W m(-1) K-1) in the Z direction.
机译：合成了一系列含有苯并恶唑（BO）单元的液晶（LC）热固性单体，以评估其固化树脂的热导体（Lambda）。含有Bo的Bisnadi酰亚胺系统在加热过程中显示了LC行为。然而，Bisnadiidimide的热固化提供了一种没有光学各向异性的薄膜;因此，固化膜表现出正常的热扩散率（α）和导热率（Lambda）。热固化过程中光学各向异性有序结构的消失可能与固化反应范围和LC范围（T-CURE-T-LC间隙）之间的温度间隙有关。此外，由于它们在可用于减少T-Cure-T-LC间隙的分子设计方面，研究了由双氧化硼和含硼二胺组成的环氧树脂。对邻苯二甲酸二丙烯型含有对苯二甲苯二氧化胺和硼二胺的组合，其具有受控的柔性链长，导致本文检查的环氧树脂体系中最小的T-Cure-T-LC间隙。固化的环氧树脂膜在Z方向上显着增加了λ值（0.257Wm（-1）k-1）。这表明T-Cure-T-LC间隙用于增强固化膜的α和λ值的重要性。在偏振光显微镜检查期间，该环氧树脂系统在连续的DC电场下固化。通过与DC电源的时间开/关切换，观察到LC域变形的迅速响应。如所预期的，固化膜在Z方向上表现出显着增强的λ值（0.488Wm（-1）k-1）。

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