查询词典 polyimide

The invention relates to polyimide molding powder with low melt viscosity and a preparation method, which uses 3,4'- diamino diphenyl ether, 3,3',4,4'-diphenyl ketone dicarboxylic anhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride, 3,3',4,4'- triphenyl diether dicarboxylic anhydride, 3,3',4,4'- diphenyl ether dicarboxylic anhydride and other monomers to polymerize at 100 to 140 DEG C, to get molding powder with a melt viscosity in the range of 1000Pa.s to 5000Pa.s.

本发明属于一种低熔体粘度聚酰亚胺模塑粉及制备方法，是采用3，4′-二氨基二苯醚同3，3′，4，4′-二苯酮四酸二酐、3，3′，4，4′-联苯四酸二酐、3，3′，4，4′-三苯二醚四酸二酐、3，3′，4，4′-二苯醚四酸二酐等单体在100～140℃聚合，获得熔体粘度在1000Pa.s～5000Pa.s范围内的模塑粉。

Value of Resin Flow, Peel Strength and Solder Heat Resistance are those of Laminate using AD (40μ m) as adhesive in press-bonding polyimide film (50μ m) with unclad FPC.

粘接剂加热流动，剥离强度和耐锡焊高温性能是指50μ m 的聚酰亚胺薄膜与 FPC，用纯胶粘接时的数值。

Its structure and property have not been understood clearly. Polyimide wear-out and breakdown can occur under long-term electric stressing due to many different reasons, making their insulating life ended. Wear-out and breakdown of polymers are closely related to the dissipation of electrostatic energy in space charge region.

聚合物的老化和击穿与空间电荷区域静电能的释放有关，电致发光代表材料中分子受激的化学活性强的状态，是能量耗散的方式之一，可作为材料预击穿及结构老化的先兆，是研究聚合物分子中的陷阱结构和它所控制的空间电荷的存贮和输运特性的重要实验手段。

Polyimide wear-out and breakdown can occur under long-term electric stressing due to many different reasons, making their insulating life ended.

但其合成方法保密，结构特性还不清楚，当其受到长时间电应力作用时，会由于多种原因发生击穿，导致其绝缘寿命终止。

The results show that the addition of triamine monomer has no obvious influences on chemical structures and aggregative states of polyimide precursors and the imidized products.

结果表明，三胺单体的加入对聚酰亚胺前体及其泡沫的化学结构和聚集态结构没有明显的影响。

Potentiometric titration technique was selected to determine the content of amic acid in polyimide precursors, which were synthesized by the two-step method. The basic potentiometric titration device was firstly improved, which can be controlled by PC and software programmed using VB.

并对常规的电位滴定装置进行了改进，用VB语言编写了上位机操作软件，实现了滴定控制、数据采集和处理等功能，建立了一套自动电位滴定测试系统。

Polyimide/nano carborundum composite films were made from pyromellitic dianhydride、4, 4'-aminodiphenyl ether、N, N'-dimethyl acetamide and nanometer carborundum.

以均苯四甲酸二酐、4，4'-二氨基二苯醚、N，N'-二甲基乙酰胺为原料，经化学合成反应制备了聚酰亚胺／纳米碳化硅复合薄膜。

In our study, polyimide hybrid films containing bimetalic compounds were prepared by codoping poly with a bariumand titanium precursor prepared from Ba(CH_3COO)_2, Ti_4, and acetic acid followed by casting and thermal curing.

陶瓷粉BTL是由Ba(CH_3COO)_2，Ti_4和乙酸制成的钡钛前驱物，采用溶胶凝胶法合成，并由红外光谱和X-射线衍射图证明，在650℃BTL完全转化为BaTiO_3晶体。 3。通过两步法合成含陶瓷粉的聚酰亚胺复合材料。

The chlorion sensitive field effect transistoris made by a core with two field effect transistors,one as Ref-ISFET by polyimide membrane as Ref-gate,another as Work-ISFETby silver chloride membrane as sensitive gate.

本文采用两个场效应管并联的芯片，在其中一个的栅区以聚酰亚胺膜作为参比膜，另一个的栅区以氯化银膜作为氯离子敏感膜，制成氯离子敏感场效应晶体管。

In order to improve the stability of the photoaligned film,a sort of polyimide material was mixed.The new azodye dopant aligning layer produced a high qualitative surface alignment,which resulted in fast response performance and good electrooptical performance.

由于聚酰亚胺良好的成膜性使得这种光诱导取向膜具有很好的稳定性，偶氮类染料的引入使得液晶表面取向更加有序，从而获得了响应快速，电光特性优良的液晶盒。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。