Preparation And Characterization Of Amphiphilic Block Copolymers Based 2-(Dimethylamino) Ethyl Methacrylate By ATRP

The macroinitiator (PMMA-Br) was first prepared from methyl methacrylate (MMA) and ethyl 2-bromopropionate (EPN-Br) in this paper,. Then, atom transfer radical polymerization (ATRP) of 2-(Dimethylamino) ethyl methacrylate (DMAEMA) was carried out using PMMA-Br as initiator, cuprous bromide as catalyst, PMDETA as the catalyst ligand. FT-IR,1H-NMR and GPC analyses show that the synthesized PMMA-Br macroinitiator and block copolymers (PMMA-b-PDMAEMA) have the desired structure with low polydispersities. In this way, the technology of ATRP with suit for our laboratory was built.The macroinitiator (mPEG-Br) was first prepared from methoxy poly(ethylene glycol) (mPEG) and 2-Bromopropionyl bromide. Double hydrophilic block copolymers of 2-(Dimethylamino) ethyl methacrylate (DMAEMA) block PEG were synthesized by ATRP using mPEG-Br and as initiator, cuprous bromide as catalyst, PMDETA as the catalyst ligand. FT-IR,1H-NMR and GPC analyses indicate that the copolymerization is well controlled with low polydispersities. Nano silver composites of mPEG-b-PDMAEMA as metrix was prepared by silver nitrate as nano silver precursor in dark and anaerobic solution without any reducing agent or energy. The resultant Ag/mPEG-b-PDMAEMA nanocomposites were characterized by IR, UV, XRD, TEM.The results indicated that double hydrophilic block copolymer with the tertiary amine can be done as dispersant and can do as reduing agent.In the anaerobic, dark, under the premise of not add any reducing agent or give any energy, the silver nitrate can be reduced to silver nanoparticles. This provided a new method for the preparation of silver nanoparticles.Rheological measurements were used to characterized the thermosensive properties of the double hydrophilic block copolymers. The result show that changes in the environment such as the polymer with the changes in pH, the polymer's lower critical solution temperature (LCST) have a major impact. Also found using the rheological measurements test the sensitivity of the polymer is more sensitive than other methods.