ATRP法合成结构对称的双羧基聚苯乙烯及其超分子的形成

SYNTHESIS OF MID-DICARBOXY POLYSTYRENE BY ATRP AND FORMATION OF IONIC-BONDED SUPRAMOLECULES

从二甲苯出发,经过溴甲基化反应、氧化反应、酯化反应和溴代反应,合成了一种四官能团的引发剂,4,6-二(溴甲基)-1,3-苯二甲酸二甲酯.用该引发剂引发苯乙烯进行原子转移自由基聚合,实验结果表明聚合反应具有活性自由基聚合的特征.通过苯乙烯的本体聚合反应获得了分子量可控、双酯基位于聚合物链中间的聚苯乙烯.经过水解反应,使聚合物中的双酯基被水解成双羧基,从而得到了结构对称的两亲性聚合物,双羧基聚苯乙烯.利用该聚合物具有分子识别的特性,与十二烷胺形成了离子键超分子化合物.此工作为超分子星形聚合物的设计合成提供了简便快捷的方法.

An intiator, dimethyl 4, 6-bis （bromomethyl） isophthalate, was synthesized by bromomethylation, oxidation, esterification and bromination reaction of 1,3-dimethylbenzene. The initiator was used to initiate the atom transfer radical polymerization of styrene successfully. The results showed that the process had good characteristics of controlled/living free radical polymerization. The molecular weight of the obtained polymer increases linearly with monomer conversion, molecular weight distribution is very narrow, and a linear relationship between ln（ [ M]0/[M ] ） and polymerization time exists. A well-defined novel structural polystyrene containing two esters groups in the mid- main chain was prepared with controlled molecular weight and narrow polydispersity. The structure of the polymer was confirmed by ^1H-NMR spectra. After being hydrolyzed, a dicarboxy polystyrene was obtained and used to form ionic-bonded supramolecules with 1-dodecanamine as a model of star-shaped supramolecules. The supramolecules formed was characterized by FTIR spectrum.