摘要
以溴乙酰溴对第4代聚丙烯亚胺树枝状大分子(DAB-32)进行改性,成功地合成了树枝状大分子引发剂DAB-32-Br,并采用FT-IR光谱和1H-NMR氢谱对引发剂的结构进行了表征.以DAB-32-Br/CuBr/Bpy为催化引发体系,分别在水和水/乙醇介质中实现了N-异丙基丙烯酰胺的原子转移自由基聚合(ATRP),并对聚合物的结构进行了表征.采用透射电子显微镜和光子相关光谱法对聚合物粒子的形貌、粒径及其分布进行了研究分析.结果表明,聚合物粒子粒径在60～150nm范围内;与水介质中ATRP相比,在水/乙醇介质中所得聚合物纳米粒子更加规则,且粒子间聚集程度较低.
Polypropylenimine dendrimer （DAB-32, generation 4.0） was converted into the macroinitiator DAB-32-Br via the reaction with bromoacetyl bromide. The structure of macroinitiator was characterized by FT-IR and 1H-NMR spectra. Dendrimer/ poly（N-isopropyl acrylamide） was prepared by atom transfer radical polymerization （ATRP） of N-isopropyl acrylamide in 1-120 and H20/CH3CH2OH media, using the DAB-32-Br/CuBr/Bpy as initiating system. The structure of resultant polymer was characterized by FT-IR spectrum. The morphology, size and size distribution of dendrimer/poly（N-isopropyl acrylamide） nanoparticles were characterized by photon correlation spectroscopy and TEM. The diameters of polymer nanoparticles were in 60-150 nm range. Compared with those in H2O medium, the nanoparticles prepared by ATRP in H2O/CH3CH2OH medium were more regular, and their aggregates were less.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2008年第6期1245-1248,共4页
The Chinese Journal of Process Engineering
基金
湖北省杰出人才基金资助项目(编号:2004ABB003)
