Anomalous reinforcing effects in cellulose gel-based polymeric nanocomposites |
| |
Authors: | Noriyuki Isobe Masahiro Sekine Satoshi Kimura Masahisa Wada Shigenori Kuga |
| |
Institution: | (1) Department of Biomaterials Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan;(2) Department of Plant & Environmental New Resources, College of Life Sciences, Kyung Hee University, 1, Seocheon-dong, Giheung-ku, Yongin-si, Gyeonggi-do, 446-701, Korea;(3) Saitama Industrial Technology Center, Kamiaoki 3-12-18, Kawaguchi, Saitama 360-0031, Japan; |
| |
Abstract: | Cellulose-synthetic polymer nanocomposite films were prepared by immersion of cellulose gel in polymer solutions followed
by dry casting. The cellulose hydrogel was prepared from aqueous alkali-urea solution. As the synthetic polymer, polystyrene
(PS) and poly(methyl methacrylate) (PMMA) were used. The polymer content could be changed between 10 and 80% by changing polymer
concentration of immersing solution. While the mechanical properties of the cellulose-PMMA composite films showed a nearly
linear dependence on PMMA content, those of cellulose-PS composites showed an anomalous behavior; both tensile strength and
Young’s modulus showed prominent maxima at 15–30 wt% PS contents. This anomaly may have resulted from the specific interaction
between the aromatic ring of PS and the hydrophobic plane of the glucopyranoside. Both PMMA and PS composite films showed
significant improvements in dimensional thermal stability; up to 25 wt% synthetic polymer content, the coefficient of thermal
expansion (CTE) was as low as ca. 30 ppm/K, about 1/3 of the pure polymers. This indicates that the regenerated cellulose
network is effective in suppressing thermal expansion of the synthetic polymers. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|