Studies On Polymer Surface Photografting For Amination

Photografting of acrylamide (AAm) on the various polymer such as low-density polyethylene (LDPE) and casting polypropylene(CPP) membranes using water, acetone(AC), ethanol(EA) as solvents and benzophonone (BP)as an initiator was investigated in certain temperature ranges. The grafted membrane was treated by Hofmann degradation around freezing point to the functionalized polymer membrane with polyvinyl amine (PVAm) structure was used to be carried out the post-functionalization reactions. The major work was as the following:1. In the system via the one-step method, the mechanism and process of the deposition grafting polymerization were detailed discussed according to the various effects of factors such as monomer and initiator contents and UV intensity on the grafting yield and the contact angle. A large amount of white deposited substance occurred and caused the system opaque at 90s. At 120s the polymerization conversion percentage reached 90%. The good linear relationship between reaction time and remained in the initial 20s. If the monomer content is constant, the maximum grafting yield using different initiator contents occurred in the process, for example, as monomer concentration was 10wt%, the initiator concentration of 2 wt% produced the maximum grafting yield. The CA decreased with the increase of time and monomer content. But at 90s, the same contact angle value for different monomer content could be explained by the fact that the skin layer of polymer substrate had been covered with grafted chains and the later reactions were dominated by the...