合成了两种新型蒽醌单体：1,4-二（辛氧基）蒽-9,10-二酮和1,4-二（丁氧基）蒽-9,10-二酮。通过红外、核磁和元素分析确证了单体的结构。DSC、TG结果显示两种新型单体的5%质量损失温度最高可达266.4℃。将新型蒽醌单体与均苯四甲酸酐在硝基苯中预聚,再将预聚产物在NaCl/AlCl3熔盐中继续反应得到改性多省并醌聚合物。通过红外光谱、热分析等方法表征改性聚合物的结构并研究了改性聚合物的介电性能。研究结果表明改性聚合物仍有较好的热稳定性,5%质量损失温度〉387℃;20Hz下改性聚合物的最大介电常数值为100,比改性前低。同时合成了乙醇可溶的改性多省并醌聚合物,20Hz下最大介电常数为19997。
Two new monomers of anthraquinone 1,4-bis(octyloxy) anthracene-9, 10-dione and 1,4-dibutoxyan thracene-9,10-dione were synthesized and characterized by FT-IR, 1 H NMR spectra and elemental analysis. Re- suhs of DSC and TG indicate melting points of two monomers are blow 130℃ and the 5% thermal decomposi tion temperatures are more than 200℃. The modified PAQR were obtained by step-growth condensation poly merization which the monomers react in nitrobenzene and then the unpurified products are dried and react in NaCl/AlCl3. The structure and thermal properties are characterized by FT-IR, TG. And the dielectric constant was studied,too. The modified PAQR still exhihits excellent thermal stability as the 5 % decomposition temper atures were over 387℃. The maximum of dielectric constant was 100 at 20Hz, which is less than the one of un modified PAQR. A class of modified polymer which was soluble in ethanol is obtained and the dielectric con stant was around 19997.
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