College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
Fisheries Research Institute, Wuhan Academy of Agricultural Sciences, Wuhan 430207, China.
Int J Biol Macromol. 2019 Nov 1;140:1026-1036. doi: 10.1016/j.ijbiomac.2019.08.167. Epub 2019 Aug 27.
Enhancing the performance of starch-based wood adhesive is vitally important for its practical applications. Accordingly, we designed the use of micronized starch (MS) to prepare micronized starch-based wood adhesive (MSWA) by incorporating 0, 2, 4 and 6% (w/w, dry basis starch) sodium dodecyl sulfate (SDS). The results showed that 2% SDS exhibited remarkable improvement in shear strength and viscosity of MSWA. The grafted reaction was demonstrated by H NMR and the steady shear results indicated that the adhesive possessed a pseudoplastic behavior under yield stress conditions. Besides, dynamic rheological measurements were applied to evaluate the structure of MSWA under varying frequencies, temperatures and constant stain. The transmission electron microscopy (TEM), Zeta potential and surface tension indicated that SDS could improve the surficial properties. Meanwhile, the microstructure of adhesive films and fracture surfaces of glued wood veneers by scanning electron microscopy (SEM) demonstrated that the migration of SDS led to the formation of surfactant layer. Furthermore, element analysis revealed the distribution of S/N in latex slices. The results of this study provide the detailed information about the influence of SDS on the rheological properties and microstructures of MSWA, which may facilitate the preparation of high performance bio-based adhesive for wood applications.
提高淀粉基木材胶粘剂的性能对于其实际应用至关重要。因此，我们设计了使用微米化淀粉 (MS) 通过掺入 0、2、4 和 6%（w/w，干基淀粉）十二烷基硫酸钠 (SDS) 来制备微米化淀粉基木材胶粘剂 (MSWA)。结果表明，2% SDS 显著提高了 MSWA 的剪切强度和粘度。通过 H NMR 证明了接枝反应，稳态剪切结果表明，在屈服应力条件下，胶粘剂具有假塑性行为。此外，动态流变测量用于评估在不同频率、温度和恒定应变下 MSWA 的结构。透射电子显微镜 (TEM)、Zeta 电位和表面张力表明 SDS 可以改善表面性能。同时，扫描电子显微镜 (SEM) 观察到的胶膜的微观结构和胶合单板的断裂表面表明 SDS 的迁移导致了表面活性剂层的形成。此外，元素分析揭示了 S/N 在胶乳切片中的分布。本研究结果提供了 SDS 对 MSWA 流变性能和微观结构影响的详细信息，这可能有助于制备用于木材应用的高性能生物基胶粘剂。
