含二苯甲烷结构四元共缩聚杂萘聚芳酰胺的合成与性能

采用自制二胺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、商品二胺4,4′-二氨基二苯甲烷和对苯二胺与对苯二甲酰氯进行低温溶液缩聚反应,改变三种二胺的比例,得到了一系列共聚酰胺树脂,其特性粘数为1·24~2·32dL/g,用FT-IR、1H-NMR手段研究了聚合物的结构;利用DSC和TGA研究了聚合物的耐热性能,结果表明,该类聚合物具有较高玻璃转化温度(301℃以上);氮气气氛中5%热失重温度在438℃以上;用一定比例的二胺制得的聚合物分别能溶于N-甲基吡咯烷酮、N,N-二甲基乙酰胺等非质子极性溶剂中并浇注得到韧性薄膜.

SYNTHESIS AND PROPERTIES OF TETRAPOLYAMIDES CONTAINING 4,4′-METHYLENEDIANILINE MOIETY

A series of tetrapolyamides were synthesized by low temperature solution polycondensation of terephthaloyl dichloride with 1,2-dihydro-2-(4-aminophenyl)-4-4-(4-aminophenonxyl) phenyl-phthalazin-1-one (DHPZ-DA),4,4′- methylenedianiline (MDA) and p-phenylene diamine(PPD).The synthesized polyamides were characterized by FTIR and ~1H-NMR.The polymers exhibited inherent viscosities of 1.24～2.32 dL/g and some were soluble in several organic solvents such as N-methyl pyrrolidone,N,N-dimethylacetamide and N,N-dimethylformamide, when the three kinds of diamines were in proper ratios.These polymers had glass transition temperatures above 301℃ and 5% weight loss above 438℃ in nitrogen.Some polyamide films were prepared from their NMP solutions and had tensile strength of 64～72 MPa,elongation at break of 4.9%～8.1% and tensile modulus of 1.7～2.1GPa.The results showed that these polyamides showed the combination of excellent thermal properties,solubility and mechanical properties.