Zhang Yun, Pang Bo, Yang Sen, Fang Wei, Yang Sheng, Yuan Tong-Qi, Sun Run-Cang
Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, No. 35 Tsinghua East Road, Haidian District, Beijing 100083, China.
Research Institute of Wood Industry, Chinese Academy of Forestry, 1 Dong Xiao Fu, Xiang Shan Road, Haidian District, Beijing 100091, China.
Materials (Basel). 2018 Jan 8;11(1):89. doi: 10.3390/ma11010089.
Polyvinyl acetate emulsion adhesive has been widely used due to its good bonding performance and environmentally friendly properties. Indeed, the bonding performance can be further improved by copolymerizing with other monomers. In this study, the effect of the adjunction of redox initiator (hydrogen peroxide-tartaric acid, H₂O₂-TA) on the properties of the poly (vinyl acetate-butyl acrylate) (P (VAc-BA)) emulsion adhesive was investigated. With increasing dosage, the reaction became more complete and the obtained film was more compact, as identified via SEM. The core-shell structure of the emulsion particles was confirmed via TEM. Results indicate that while the initiator content increased from 0.5 to 1.0%, a clearer core-shell structure was obtained and the bonding strength of the plywood improved from 2.34 to 2.97 MPa. With the further incorporation of H₂O₂-TA (i.e., 1.5%), the bonding performance deteriorated. The optimum wood bonding strength (2.97 MPa) of the prepared P (VAc-BA) emulsion adhesive was even better than that (2.55 MPa) of a commercial PVAc emulsion adhesive, suggesting its potential application for the wood industry.
聚醋酸乙烯酯乳液胶粘剂因其良好的粘结性能和环保特性而被广泛应用。事实上，通过与其他单体共聚可以进一步提高其粘结性能。在本研究中，研究了氧化还原引发剂（过氧化氢-酒石酸，H₂O₂-TA）的添加对聚（醋酸乙烯酯-丙烯酸丁酯）（P（VAc-BA））乳液胶粘剂性能的影响。通过扫描电子显微镜（SEM）鉴定，随着用量增加，反应更完全，所得薄膜更致密。通过透射电子显微镜（TEM）确认了乳液颗粒的核壳结构。结果表明，当引发剂含量从0.5%增加到1.0%时，获得了更清晰的核壳结构，胶合板的粘结强度从2.34 MPa提高到2.97 MPa。随着H₂O₂-TA的进一步加入（即1.5%），粘结性能变差。制备的P（VAc-BA）乳液胶粘剂的最佳木材粘结强度（2.97 MPa）甚至优于市售聚醋酸乙烯酯乳液胶粘剂的粘结强度（2.55 MPa），表明其在木材工业中的潜在应用价值。
