title: Radical graft polymerization of an allyl monomer onto hydrophilic polymers and their antibacterial nanofibrous membranes.
abstract: Hydrophilic poly (vinyl alcohol-co-ethylene) (PVA-co-PE) copolymers with 27 mol %, 32 mol % and 44 mol % ethylene were functionalized by melt radical graft copolymerization with 2,4-diamino-6-diallylamino-1,3,5-triazine (NDAM) using reactive extrusion. This functionalization imparts antibacterial properties. The covalent attachments of the NDAM as side chains onto the PVA-co-PE polymer backbones were confirmed. The effects of initiator concentrations and ethylene contents in PVA-co-PE polymers on grafting of NDAM were studied. The chain scissions of PVA-co-PE polymers during reactive extrusion were investigated by monitoring changes in the melt torque and FTIR spectra. The NDAM grafted PVA-co-PE polymers were successfully fabricated into hydrophilic nanofibers and nanofibrous membranes with sufficient surface exposure of the grafted NDAM. The hydrophilicity of the PVA-co-PE polymers and the large specific surface area offered by the nanofiber membranes significantly facilitated the chlorine activation process, enhanced the active chlorine contents of the grafted PVA-co-PE nanofiber membranes, and therefore led to their superior antibacterial properties.
authors: College of Materials Science and Engineering, Wu Han Textile University, Wu Han 430073, China.
authors: Dong
authors: D
authors: Wang
authors: Weilin
authors: W
authors: Xu
authors: Gang
authors: G
authors: Sun
authors: Bor-Sen
authors: BS
authors: Chiou
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology; D005609:Free Radicals / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D008567:Membranes, Artificial; D057139:Nanofibers / Q000737:chemistry*; D058105:Polymerization; D011108:Polymers / Q000737:chemistry* / Q000494:pharmacology; D017550:Spectroscopy, Fourier Transform Infrared; D014227:Triazines / Q000737:chemistry
chemical_list: D000900:Anti-Bacterial Agents; D005609:Free Radicals; D008567:Membranes, Artificial; D011108:Polymers; D014227:Triazines