杂萘聚芳酰胺的合成与性能

Synthesis and properties of heterocyclic copolyamides

由自制的1,2-二氢-2-(4-氨基苯基)-4-[4-(4-氨基苯氧基)-苯基]-二氮杂萘-1-酮(DHPZ-DA)、4,4'-二氨基二苯甲烷(DAPM)、对苯二胺与对苯二甲酸进行缩聚合,改变不同二胺的配比,制成一系列高相对分子质量的聚芳酰胺,其特性粘数为0.81～238 dL/g.用傅里叶变换红外光谱和核磁共振氢谱分析了聚合物的结构,利用差示扫描量热法和热重分析研究了聚合物的耐热性能,结果表明:聚芳酰胺的玻璃化转变温度在220℃以上,氮气气氛中,5%热失重温度在450℃以上;当DHPZ-DA的摩尔分数与DAPM的摩尔分数之和超过70%时,聚合物能溶于非质子极性溶剂中.

High molecular weight aromatic polyamides were prepared from homemade 1,2 -dihydro -2 -(4 -aminophenyl) -4 -[4 -(4 -aminophenonxyl)phenyl] -phthalazin -1 -one (DHPZ -DA), 4,4' -diamino diphenyl methane (DAPM), p-phenylene diamine and terephthalic acid via direct polycondensation reaction in N-methylpyrrolidone, using triphenyl phosphite and pyridine as condensing agents. The polymers were characterized by Fourier transform infrared spectrometry, hydrogen spectrum of nuclear magnetic resonance, thermo gravimetry and differential scanning calorimetry. The results show that the polymers, obtained at yield of 96% -99%, possess inherent viscosities ranging from 0.81 to 2.38 dL/g, glass transition temperatures above 220℃, and temperature at 5% weight loss in nitrogen atmosphere above 450℃. When the sum of mole fraction of DHPZ-DA and DAPM exceeds 70%, the resultant polymer can be dissolved in the non- protonic solvent.