ATRP Modified Cellulose Membrane And Study For Its Performance

Cellulose has lots of advantages：abundant in resources,renewable,low cost,goodbiocompatibility and so on,at present,cellulose and its derivatives have been appliedin various industries,grafting zwitterionic compounds on the surface of materials caneffectively improve its biological antipollution,atom transfer radical polymerization(ATRP) is a new modification method:good controllability,well maneuverability,easyto industrialization and can also synthesize specified structured polymers.Base on the status of there is few reports about graft zwitterionic compounds tothe surface of cellulose membrane by ATRP to improve its antibacterialperformance.At first,we use medical cotton as raw materials,select the appropriatedissolution system(NaOH/urea) to dissolve cellulose,then product the cellulosemembrane which we needed by flow casting technology,after that,graft zwitterioniccompound SBMA to the surface of the cellulose membrane by ATRP,study for itsinfluence to biocompatibility of the cellulose membrane,especially to explore theantibacterial performance of the modified membrane.Our purpose is to prepare a kindof functional cellulose materials with good biological antipollution and outstandingantibacterial performance in especial.The results show that NaOH/urea system is an efficient dissolution system tocellulose,FT-IR shows that the cellulose membrane prepared by flow castingtechnology has a very high purity,there is almost no impurities,at the same time,weget the best way to prepare cellulose membrane:6%NaOH and10%urea cancompletely dissolve1g cellulose at-16℃,the membrane obtained satisfied our nextexperiment requirement,in the modified part,FT-IR and XPS show that we havegrafted SBMA to the membrane successfully in the form of a covalent bond, SEMshow that cellulose membrane’s surface morphology have not changed aftermodified,there is no damage to it’s structure,and a lot of its properties have beenpromoted evidently,like hydrophilic, protein adsorption resistance, antimicrobialproperties and so on,TG shows that the initial decomposition temperature of thecellulose membrane have been enhanced after graft SBMA,it have a better thermalperformance,water contact angle test shows that the modified membrane’s watercontact Angle is close to0°，that is to say it can combine more water and have abetter hydrophily,protein adsorption resistance test shows that cellulose membranegrafted SBMA have the obvious resistance to BSA,arbuz and lysozyme,it has good resistance to nonspecific protein adsorption,antimicrobial assessment shows that theantibacterial rate of the modified membrane which graft SBMA for4h is nearly90%,it have a prominent antibacterial performance，and the longer SBMA grafted,thestronger of the antibacterial performance behaved of the cellulose membrane.