Bhuiyan Md Saleh Akram, Wang Kan, Razaviamri Fatemeh, Lee Bruce P
Department of Biomedical Engineering, Michigan Technological University 1400 Townsend Drive Houghton Michigan 49931 USA
RSC Appl Polym. 2024 Jun 10;2(5):838-846. doi: 10.1039/d4lp00139g. eCollection 2024 Sep 19.
The feasibility of utilizing salicylhydroxamic acid (SHAM) as a new adhesive molecule for designing structural adhesives is investigated in this study. SHAM-containing polymers were prepared with a hydroxyethyl methacrylate (HEMA) or methoxyethyl acrylate (MEA) backbone and mixed with polyvinylidene fluoride (PVDF). PVDF was included to increase the cohesive property of the adhesive through hydrogen bond (H-bond) formation with the adhesive polymers. SHAM-containing adhesive demonstrated lap shear adhesion strength ( ) greater than 0.9 MPa to glass, metal, and polymeric surfaces. Adhesive formulations with elevated SHAM-content also demonstrated increased adhesive properties with values reaching as high as 4.8 MPa. Due to the physically crosslinked nature of these adhesives, formulations with extensive H-bonding resulted in strong adhesion and stability. HEMA consists of a terminal hydroxyl group with both H-bond donor and acceptor, which enabled HEMA-containing adhesives to demonstrate strong adhesion even without PVDF. On the other hand, MEA contains a methoxy group that lacks H-bond donors for forming H-bonding and MEA-containing adhesives required PVDF to provide H-bond acceptors to increase its cohesive property. An aging study was performed on the bonded joints. While the adhesive joints did not demonstrate any reduction in values over 25 days when incubated in a dry condition, values decreased by 80% over 48 h when incubated in water. This is potentially due to the hydrophilic and physically crosslinked nature of the adhesive. Nevertheless, the SHAM-containing adhesive outperformed a catechol-containing adhesive and epoxy glue and is a promising new adhesive molecule for designing structural adhesives.
本研究探讨了利用水杨羟肟酸（SHAM）作为一种新型粘合分子来设计结构胶粘剂的可行性。含SHAM的聚合物由甲基丙烯酸羟乙酯（HEMA）或丙烯酸甲氧基乙酯（MEA）主链制备而成，并与聚偏二氟乙烯（PVDF）混合。加入PVDF是为了通过与胶粘剂聚合物形成氢键来提高胶粘剂的内聚性能。含SHAM的胶粘剂对玻璃、金属和聚合物表面的搭接剪切粘合强度大于0.9MPa。SHAM含量升高的胶粘剂配方也表现出增强的粘合性能，其值高达4.8MPa。由于这些胶粘剂的物理交联性质，具有广泛氢键作用的配方产生了很强的粘合力和稳定性。HEMA由具有氢键供体和受体的末端羟基组成，这使得含HEMA的胶粘剂即使没有PVDF也能表现出很强的粘合力。另一方面，MEA含有一个缺乏形成氢键的氢键供体的甲氧基，含MEA的胶粘剂需要PVDF提供氢键受体来提高其内聚性能。对粘合接头进行了老化研究。虽然在干燥条件下孵育25天时，粘合接头的 值没有任何降低，但在水中孵育48小时时， 值下降了80%。这可能是由于胶粘剂的亲水性和物理交联性质。尽管如此，含SHAM的胶粘剂性能优于含儿茶酚的胶粘剂和环氧树脂胶，是一种有前途的用于设计结构胶粘剂的新型粘合分子。
