摘要
利用2-溴代异丁酸乙酯(NA)做为引发剂,通过原子转移自由基聚合(ATRP)合成聚甲基丙烯酸环氧丙酯(PGMA).乙二胺(EDA)对PGMA的环氧基团进行开环反应制备具有亲水性质的梳状聚合物PGMA-g-EDA.用核磁共振(1H-NMR),红外光谱(FTIR)及凝胶渗透色谱(GPC)表征了PGMA和PGMA-g-EDA的结构和分子量分布.PGMA-g-EDA聚合物对量子点进行修饰,通过配体交换,制备水溶性的量子点(PGMA-g-EDA-QDs).通过紫外-可见光谱(UV-Vis)及荧光发射光谱(PL)对该量子点进行光学性质的研究,结果表明量子点的结构未被破坏,保持了原量子点的光学性质.用透射电镜(TEM)及动态光散色(DLS)表征,结果表明得到的水溶性量子点尺寸小,分布均匀,无团聚.通过研究量子点对光氧化,化学氧化,耐酸性的研究表明该方法得到的水溶性量子点具有很好的稳定性,并且聚合物的合成和量子点的修饰方法方便简单.
Poly(glycidylmethacrylate),(PGMA) is prepared by atom transfer radical polymerization(ATRP),while 2-bromoisobutyrate ethyl(NA) is used as the initiator.Hydrophilic comb polymer PGMA-g-EDA is prepared through the ring-opening reaction of PGMA with ethylenediamine(EDA).Nuclear magnetic resonance,infrared spectroscopy and gel permeation chromatography were used to characterize the structure and molecular weight distribution of PGMA and PGMA-g-EDA.The comb polymer PGMA-g-EDA modified quantum dots(QDs) by ligand exchange to prepare water-soluble quantum dots.The quantum dots has good stability in water,UV-Visible spectroscopy and fluorescence emission spectra were used to study the optical properties of quantum dots,indicating that the QDs aren't destroyed and have the same optical properties of the unmodified QDs.Transmission electron microscopy and dynamic light scattering color test show that the water-soluble quantum dots are monodisperse,uniform,and have small size,no significant surface deterioration or aggregation and solubility in water.The stability of QDs is studied against photo-oxidation,H2O2-oxidation and acid etching,the result implies that the QDs are very stable in water,and no deterioration or aggregation of the quantum dots occurrs in water.What's more,the way of synthesis of PGMA and PGMA-g-EDA and modification of QDs are extremely convenient.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2013年第8期1039-1046,共8页
Acta Polymerica Sinica
关键词
甲基丙烯酸环氧丙酯
原子转移自由基聚合
开环反应
量子点
水溶性
Glycidylmethacrylate,Atom transfer radical polymerization,Ring-opening reaction,Quantum dots,Water-soluble
