fiber surface modification of kraft pulp in presence of chitosan polymer
نویسندگان
چکیده
the effect of fiber surface modification on physical and mechanical properties of kraft pulp wasstudied with and without chitosan. first, the amount of carboxyl groups of kraft pulp at differentaddition levels (0, 2, 3, 4 and 6%) of hydrogen peroxide was determined by means of methylene bluetest. then, the samples containing the highest carboxyl groups were treated at ph=8.5 with chitosan at0.75% addition level (based on oven dry pulp). results showed that individual surface modification offibers increased the strength properties of paper. it was also indicated that alone application ofchitosan can act as a dry strength agent due to its ability to produce hydrogen, ionic and covalentbonding. also, surface modification of fibers by h2o2 lead to increase of carboxyl groups followed byincreasing anionic charge with together with chitosan formed a dual system. the effect of chitosan onapparent density, tensile index and burst index of kraft paper were significant and on the tear index ofpaper was not significant. in the current study, the best results obtained at level of 3% hydrogenperoxide.
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عنوان ژورنال:
جنگل و فرآورده های چوبجلد ۶۷، شماره ۳، صفحات ۴۸۹-۵۰۱
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