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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >Organosoluble, low dielectric constant and highly transparent fluorinated pyridine-containing poly(ether imide)s derived from new diamine: 4-(4-trifluoromethyl)phenyl-2,6-bis[4-(4-amino-2-trifluoromethylphenoxy)phenyl]pyridine
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Organosoluble, low dielectric constant and highly transparent fluorinated pyridine-containing poly(ether imide)s derived from new diamine: 4-(4-trifluoromethyl)phenyl-2,6-bis[4-(4-amino-2-trifluoromethylphenoxy)phenyl]pyridine

机译：衍生自新二胺的有机溶胶，低介电常数和高透明的含氟化吡啶的聚（醚酰亚胺）S：4-（4-三氟甲基）苯基-2,6-双[4-（4-氨基-2-三氟甲基苯氧基）苯基 ]吡啶

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摘要

A new aromatic diamine, 4-(4-trifluoromethyl)phenyl-2,6-bis[4-(4-amino-2-trifluoromethylphenoxy)phenyl]pyridine, was synthesized by a modified Chichibabin reaction of 4-(4-nitro-2-trifluoromethylphenoxy)acetophenone with 4-triflouromethylbenzaldehyde, followed by catalytic reduction. A series of fluorinated pyridine-containing aromatic poly(ether imide)s (PEIs) were prepared from the diamine monomer with various aromatic dianhydrides via conventional two-step thermal imidization method. The resulting PEIs had inherent viscosities values of 0.68-0.90 dL/g, and could be cast and thermally converted into transparent, flexible, and tough polymer films. These PEIs were predominantly amorphous, had good solubility in common solvents such as NMP, DMAc and m-cresol at room temperature, and displayed excellent thermal stability with the glass transition temperatures of 258-315 degrees C, the temperatures at 5% weight loss of 550-585 degrees C, and the residue of higher than 55% at 750 degrees C in nitrogen. Moreover, the PEIs films showed outstanding mechanical properties with tensile strengths of 74.8-103.5 MPa, tensile moduli of 1.08-1.45 GPa, and elongations at break of 10.6-24.4%. These PEIs also exhibited low dielectric constants of 2.81-2.98 (1 MHz) and water uptake 0.39-0.68%, as well as high optical transparency with the UV cutoff wavelength in the 350-378 nm range and the wavelength of 80% transparency in the range of 412-510 nm.
机译：通过4-（4-硝基 - 4-硝基 - 4-硝基 - 2-三氟甲基苯氧基）苯乙酮，具有4-三氟甲基苯甲苯胺，其次是催化还原。通过常规两步热酰亚胺化方法用各种芳族二酐制备一系列含氟吡啶芳族芳族聚（醚酰亚胺）S（PEIS）。得到的PEI具有0.68-0.90dl / g的固有粘度值，并且可以浇铸并热转换成透明，柔性和坚韧的聚合物膜。这些PeI主要是无定形的，在室温下普通溶剂如NMP，DMAC和M-甲酚的良好溶解度，并显示出优异的热稳定性，玻璃化转变温度为258-315摄氏度，温度为5％重量损失550-585℃，残留物高于750℃的氮气下的55％。此外，PEI薄膜显示出优异的机械性能，抗拉强度为74.8-103.5MPa，拉伸模量为1.08-1.45GPa，断裂伸长率为10.6-24.4％。这些PEI也表现出低介电常数为2.81-2.98（1MHz）和水吸收0.39-0.68％，以及在350-378nm范围内的UV截止波长和80％透明度的高光透明度。范围为412-510 nm。

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