An amphiphilic graft copolymer, consisting of a polysulfone (PSf) main chain and poly(n-isopropylacrylamide) (PNIPM) grafts, was synthesized via combination atom transfer radical polymerization click chemistry. The copolymer's structure characteristics (PNIPM length content) substantially impacts membrane morphology performance, were optimized firstly. resulting copolymer PSf-g-PNIPM with the b...

A native potato starch was modififi ed with vinyl acetate by graft polymerization in alkaline medium pH 10 the mode of temperature change from 70 to 80°C for 4 hours. The initiator process ammonium persulfate (NH ) 2 S O 8 . conversion 91,5%. chemical structure copolymer (Starch:Vinyl acetate) confifi rmed IR-spectroscopy. Composite materials and triethyl citrate tensile strength 24 MPa were ob...

Guanine-rich oligonucleotides, such as TG(4)T and TG(5)T, assemble into a tetramolecular quadruplexes with layers of G-quartets stabilized by coordination to monovalent cations. Association rates of the quadruplexes are extremely slow, likely owing to electrostatic repulsion among the four strands. We have shown that comb-type copolymers with a polycation backbone and abundant hydrophilic graft...

Graft copolymerization of acrylamide (Am) onto rubberwood fibre (RWF) was carried out by free radical initiation. Ceric ammonium nitrate was used as an initiator system. The effects of temperature, dose of initiator, ratio of monomer to fibre, and nitric acid concentration, on the grafting percentage were investigated. The optimum reaction temperature was found to be about 50°C for 4h and with ...

In an attempt to interact natural bone and bone cells with biomaterials and to begin to develop modular tissue engineering scaffolds, substrates containing phosphonate groups were identified to mimic mineral-protein and natural polymer-protein interactions. In this study, we investigated poly(vinyl phosphonic acid) copolymer integration with existing materials as a graft-copolymer surface modif...

on Amphiphilic Graft Copolymer Films by William A. Kuhlman B.S. Chemistry New York University, 2000 B.E. Materials Science Stevens Institute of Technology, 2000 Submitted to the Department of Materials Science and Engineering in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in Materials Science and Engineering at the Massachusetts Institute of Technology June 20...

Synthesized graft copolymers of chloroprene rubber with acrylic acid. A mixture benzene and dimethylformamide was used as a solvent, potassium persulfate polymerization initiator. Based on the dependence copolymerization rate concentrations components temperature, order reaction in terms concentration acid (2.0), (1.2) activation energy process (24.4 kJ/mole) were determined. The degree graftin...