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Antimicrobial-modified sulfite pulps prepared by in situ copolymerization |
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| Authors: | Yong Guan Huining Xiao Heather Sullivan Anna Zheng |
| Institution: | aDepartment of Chemical Engineering, University of New Brunswick, Fredericton, NB, Canada E3B 5A3 bState Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China cSchool of Material Science and Engineering, East China University of Science and Technology, Shanghai 200237, China |
| Abstract: | Grafting guanidine polymer (PHGH) onto cellulose fibers was conducted via in situ free-radical polymerization using ceric ammonium nitrate (CAN) as an initiator. The optimum reaction conditions were obtained, under which the grafting percentage and the grafting efficiency reached over 20% and 50%, respectively. Atomic force microscopy (AFM) images revealed that the grafted polymer tended to form grains with diameters ranging from 60 to 200 nm. AFM also enabled us to identify the location of the grafts on the surfaces of cellulose fibers by the measurements of the adhesion and attraction forces between a colloid probe and the samples. The cellulose fibers were rendered antimicrobial in the presence of 1.0% (wt) grafted polymer, and an excellent antimicrobial activity (over 99% inhibition) toward Escherichia coli was achieved. The AFM results also demonstrated that the antimicrobial mechanism of PHGH is to destroy the membrane of the cells. |
| Keywords: | Cellulose fiber In situ graft polymerization Guanidine polymer AFM Antimicrobial |
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