Synthesis And Characterization Of Functional Polymers

Functional polymers are connected with the functional groups and has a high molecular weight polymer. Because of these polymers having a functional group to have the appropriate functionality. These polymers may be used like ATRP or RAFT polymerization process. Polymers having different molecular structures can exhibit different morphologies rich. Depending on the morphology of these polymers also have a corresponding application. The column polymer brush and block copolymers and other functional polymers. Details are as follows:1.By copper-catalyzed azide-alkyne coupling reaction (CuAAC), synthesized by the use of grafting-onto polymethylmethacrylate pentynyl ester ethyl ester-graft-(acrylic acid-block-polyethylene oxide) (PHEMACCH-g-(PAA-b-PEO)) cylindrical polymer brushes. First, by reversible addition-fragmentation chain transfer (the RAFT) polymerization of synthetic alkynyl group having a main chain side groups polymethacrylic acid ethyl ester pentyl ester alkynyl, atom transfer radical polymerization (the ATRP) Synthesis of side chain polyethylene ethylene oxide-block-end of polyacrylic acid tert-butyl ester and azide. Then, with efficient CuAAC reaction, the end of the stack with nitrogen groups side chains are grafted onto the main chain with a pendant alkyne group, to obtain a high density grafted side columnar polymer brushes, and acid-catalyzed hydrolysis of t butyl ester obtained PHEMA-g-(PAA-b-PEO) polymer side chain carboxyl functional groups with internal brush. Polymer brushes were characterized by proton nuclear magnetic resonance spectroscopy (1H-NMR) and size exclusion chromatography (SEC). The combined use of the side chain carboxyl group in situ reduction of silver ions collateral to obtain cylindrical polymer brush supported Ag nanoparticles.2.Cylindrical polymer brushes with densely grafted cyclic side-chains are synthesized via the grafting-onto method. The structure and composition of the polymers are well characterized. Linear polynorbornylene derivative (l-PND) backbones containing alkynyl groups are prepared by ring opening metathesis polymerization (ROMP), and cyclic poly(tert-butyl acrylate) side-chains (c-PtBA) containing azide groups are synthesized by the combination of atom transfer radical polymerization (ATRP) and copper catalyzed azide-alkyne cycloaddition (CuAAC) reaction. Then, the cyclic side-chains are grafted densely onto the backbone by CuAAC reaction to form a cylindrical polymer brush. The structures of the polymers were characterized by’H-NMR, gel permeation chromatography (GPC) and infrared (IR) spectra. The obtained polymer brush has a long backbone of 400 degree of polymerization. The densely grafted side-chains lead to an elongation of the backbone. A single molecule of the polymer brush shows a wormlike (cylindrical) morphology observed by the atomic force microscopy (AFM). The length of the polymer brush is 200 nm, and the diameter is 30 nm. The polymer brush with cyclic side-chains is observed as a wormlike molecule for the first time, which has great reference value to study the influence of the topological structure (backbone and side-chains) on the morphology of the polymer brushes.3. synthesized by RAFT polymerization cross-linking two segments of the block copolymer PDMAEMA-b-PTEPM, and synthesized by RAFT polymerization in which homopolymers continuous phase PDMAEMA, through the design of the volume fraction ratio between the two blocks, and a blend of homopolymer of bulk micro-phase separation in the acid environment of the body will be micro-phase separation sample crosslinked, and then dispersed in a good solvent to prepare a functional nanoparticles. By’H-NMR spectroscopy (’H-NMR), gel permeation chromatography (GPC) and infrared spectroscopy (IR) and homopolymers of the block polymer structure and composition were characterized by their morphology was observed by transmission electron microscope (TEM) were observed. The degree of polymerization of block ratio is 3:1, the morphology of the body micro-phase separation of the sheet, the copolymer is added to the homopolymer phase change wherein a volume fraction, thereby changing the micro-phase separation morphology, when added one phase to another phase ratio increased to 5:1, into a cylindrical shape, when the ratio changed to 20:1, into a spherical shape.