writer：Dong Wang,?,? Weilin Xu,? Gang Sun,*,? and Bor-sen Chiou
keywords：radical graft polymerization, hydrophilic polymers, antibacterial nanofibrous membranes
source：期刊
Issue time：2011年
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 NDAMas 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.