Highly branched aromatic polymers prepared by single step syntheses
Highly branched aromatic polymers prepared by single step syntheses
复制标题
DOI：
10.1002/masy.19940770106
复制
发表时间：
1994
影响因子：
--
通讯作者：
Y. H. Kim
中科院分区：
文献类型：
--
作者：
Y. H. Kim
综述了由AB 2型单体合成的高度支化的聚苯撑、聚苯醚、芳香族聚酯和聚酰胺。通过3，5-二卤代苯基有机金属试剂的芳基-芳基偶联反应得到聚亚苯基。13 C NMR表明约70%的支化效率。观察到Tg为236°C，但聚合物不形成膜。以2，4，6-三溴苯酚和2，4-二溴苯酚为原料，通过氧化偶联制备聚醚。前一种单体得到高分子量的聚合物，但后一种单体不能很好地溶解。以3，5-二氨基苯甲酸（I）和3-氨基丙酸衍生物为原料，在酰胺溶剂中进行缩合反应，合成了溶致超支化芳香聚酰胺。GPC表明在不存在络合盐的情况下，酰胺溶剂中聚合物聚集程度很大。
Highly branched polyphenylenes, polyphenylene ethers, aromatic polyesters and polyamides synthesized from AB2 type monomers are reviewed. Polyphenylenes were obtained by aryl-aryl coupling reactions of 3,5-dihalo-phenyl organometallic reagents. 13C NMR indicates about 70% branching efficiency. A Tgat 236°C was observed, but the polymer did not form films. Polyethers were prepared by oxidative coupling of 2,4,6-tribromophenol and 2,4-dibromophenol. The former monomer gave high molecular weight polymers but the latter monomer did not polymerize well. Condensation of 3,5-diaminobenzoic acid (I) and 3-aminoisophthalic acid derivatives in an amide solvent gave lyotropic hyperbranched aromatic polyamides. The GPC indicated a large degree of polymer aggregation in the amide solvent in the absence of a complexing salt.