Kobayashi Junya, Kaneko Masahiro, Supachettapun Chamaiporn, Takada Kenji, Kaneko Tatsuo, Kim Joon Yang, Ishida Minori, Kawai Mika, Mitsumata Tetsu
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan.
Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, Nomi 923-1292, Japan.
Polymers (Basel). 2023 Dec 26;16(1):80. doi: 10.3390/polym16010080.
The mechanical properties for paper sheets composited with glucose (Glc), methyl cellulose (MC), and carboxymethyl cellulose (CMC) were investigated. The paper composites were prepared by immersing paper sheets in aqueous solutions of these materials and drying at 100 °C for 30 min. The stress-strain curves for these paper composites were measured by a uniaxial tensile apparatus with a stretching speed of 2 mm/min. The breaking stress and strain for untreated paper were 24 MPa and 0.016, respectively. The paper composites demonstrated stress-strain curves similar to the untreated paper; however, the breaking point largely differed for these composites. The breaking strain and breaking stress for the Glc composite slightly decreased and those for the MC composite gradually increased with the concentration of materials composited. Significant increases in the mechanical properties were observed for the CMC composite. The breaking stress, breaking strain, and breaking energy for the 3 wt.% CMC composite were 2.0-, 3.9-, and 8.0-fold higher than those for untreated paper, respectively. SEM photographs indicated that the CMC penetrated into the inner part of the paper. These results strongly suggest that the mechanical improvement for CMC composites can be understood as an enhancement of the bond strength between the paper fibrils by CMC, which acts as a bonding agent. It was also revealed that the breaking strain, breaking stress, and breaking energy for the CMC composites were at maximum at the first cycle and decreased gradually as the immersion cycles increased.
研究了与葡萄糖（Glc）、甲基纤维素（MC）和羧甲基纤维素（CMC）复合的纸张的机械性能。通过将纸张浸入这些材料的水溶液中并在100°C下干燥30分钟来制备纸张复合材料。使用拉伸速度为2mm/min的单轴拉伸装置测量这些纸张复合材料的应力-应变曲线。未处理纸张的断裂应力和应变分别为24MPa和0.016。纸张复合材料显示出与未处理纸张相似的应力-应变曲线；然而，这些复合材料的断裂点有很大差异。随着复合材料浓度的增加，Glc复合材料的断裂应变和断裂应力略有下降，而MC复合材料的则逐渐增加。观察到CMC复合材料的机械性能有显著提高。3wt.% CMC复合材料的断裂应力、断裂应变和断裂能分别比未处理纸张高2.0倍、3.9倍和8.0倍。扫描电子显微镜照片表明CMC渗透到纸张内部。这些结果有力地表明，CMC复合材料的机械性能改善可理解为CMC作为粘合剂增强了纸张原纤维之间的结合强度。还发现，CMC复合材料的断裂应变、断裂应力和断裂能在第一个循环时最大，并随着浸泡循环次数的增加而逐渐降低。
