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以PEO-Br为大分子引发剂,通过ATRP法合成了一组两亲性两嵌段共聚物PEO45-bPtBAx(x=28,35,53).采用HNMR、FTIR、SEC和TEM对产物进行了表征,讨论了投料比对控制产物的分子链结构,分子量及其分布的影响.结果表明,tBA的转化率较高,1 H NMR结果显示成功制得目标产物,所得嵌段共聚物均具有极窄的分子量分布(Mw/Mn≤1.07).在tBA相对于PEO-Br的投料比较小时可以对嵌段共聚物结构进行精确调控.tBA投入量的增大会导致分子量分布变宽及引发效率下降.PEO45-b-PtBA35被成功水解为PEO45-b-PAA35,在中性水溶液中PEO45-b-PAA35自组装形成了分散较为均匀的球形胶束.
A series of amphiphilic diblock copolymers PEO45-bPtBAx (x = 28,35,53) were synthesized by ATRP using PEO-Br as the macroinitiator.The products were characterized by HNMR, FTIR, SEC and TEM The results showed that the conversion rate of tBA was higher and the result of 1 H NMR showed that the target product was obtained successfully. Narrow molecular weight distribution (Mw / Mn ≤ 1.07) The block copolymer structure can be finely tuned when the feed of tBA to PEO-Br is relatively small, and the increase of the amount of tBA injected results in broadening of the molecular weight distribution and reduction of the initiation efficiency. PEO45-b-PtBA35 was successfully hydrolyzed to PEO45-b-PAA35. In neutral aqueous solution, PEO45-b-PAA35 self-assembled into spherical micelles.