双亲性嵌段共聚物P4VP-b-PMAA的合成

Synthesis of Amphiphilic Block Copolymer P4VP-b-PMAA

以三[（2-二甲基氨基）乙基]胺为配体,α-氯代丙酸乙酯为引发剂,在异丙醇中引发4-乙烯吡啶（4VP）进行原子转移自由基聚合（ATRP）,得到了端基为氯原子、相对分子质量在1 500-5 610之间的聚4-乙烯吡啶（P4VP-Cl）大分子引发剂。进而使P4VP-Cl引发甲基丙烯酸叔丁酯（tBMA）进行ATRP反应,得到了P4VP-b-PtBMA嵌段共聚物,其转化率可达60%以上。傅里叶变换红外光谱和核磁共振的分析结果表明,所得嵌段共聚物的结构明确。通过对P4VP-b-PtBMA进行水解,得到了P4VP-b-PMAA双亲性嵌段共聚物。

Atom transfer radical polymerization （ATRP） of 4-vinyl pyridine （4VP） was studied using ethyl-2-chloropropionate （ECP） as initiator, CuCl and tris[2-（dimethylamino）ethyl]amine （Me6TREN） as catalyst and ligand in 2-propanol. The number-average molecular weight of the poly（4-vinylpyridine） with a chlorine end group （P4VP-Cl） can be controlled from 1 500 to 5 610 by adjusting polymerization time based on the analysis of gel permeation chromatography （GPC）. Poly（4-vinylpyridine）-b-poly（tert-butylmethacrylate） （P4VP-b-PtBMA） was then prepared by ATRP using P4VP-Cl as macroinitiator. The result shows that the conversion of tBMA can reached to 60%. Structures of P4VP-Cl and P4VP-b-PtBMA were characterized by means of Fourier transform infrared （FTIR） spectroscopy, nuclear magnetic resonance （1H-NMR）. Furthermore, the P4VP-b-PtBMA was then hydrolyzed under room temperature to form amphiphilic block copolymer P4VP-b-PMAA in the presence of CF3COOH.