Document Type : Research Paper
Authors
1 Assist. Prof., Faculty of New Technologies Eng., Shahid Beheshti University, Iran
2 M.Sc. student, Faculty of New Technologies Eng., Shahid Beheshti University, Iran
Abstract
DOR:98.1000/1735-0913.1398.34.1.66.1.1578.32
Providing some paradox properties of paper products at the same is of utmost challenging issues of papermakers, e.g., attaining proper strength together with high water absorbency in hygienic papers. Because higher bonding resulted in lesser accessibility to the hydrophilic functional group. Therefore, hydrogel as an ever-increasing material in bulk cellulosic diapers were surficial coated on paper and compared with distillated water saturated papers. The prepared chitosan-acrylic acid (AA) hydrogel converted into nanoparticles by ultrasonic homogenizer and the nano scaled particles approved by Dynamic Light scattering (DLS). SEM images and paper caliper revealed the nanohydrogel coating layer. All papers water uptake coated with 1, 1.5 and 2% nanohydrogel increased significantly up to 50% compared to the untreated sample. Burst and dry tensile strengths along with water uptake improved, with no toleration in tear strength. Increased fiber bonding due to plenty of carboxylic acid in AA together with hydroxyl and amine groups in chitosan, along with nanohydrogel film formation as a complementary assembly and constituent with the cellulosic substrate of paper were resulted in strength improvement. Wet tensile strength of paper revealed remarkable increment at 2% coating application, only; without enhancing effects at the lower dosages. Paper opacity, brightness and whiteness stayed almost stable, but due to chitosan yellowish nature, the paper yellowness increased. The coated paper stiffness enhanced compared to untreated paper, but revealed lesser stiffness than water saturated papers. Water treated papers revealed caliper, tensile and burst indices reduction and stiffness rising.
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