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 arent 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.Whats more

the way of synthesis of PGMA and PGMA-g-EDA and modification of QDs are extremely convenient.