基于儿茶酚交替共聚物的干湿态双高效胶黏剂材料

以多巴胺(DA)和双酚A型环氧树脂(BAER)进行氨基-环氧点击化学反应, 合成了儿茶酚功能化交替共聚物聚(多巴胺-alt-双酚A型环氧)P(DA-a-BAER)]. 以FeCl₃为交联剂, 研究了交联剂用量对聚合物在干态及水下环境中黏接性能的影响. 结果表明, 该聚合物可以在干态及水下环境中对多种基材进行黏接. 以不锈钢基材为例, 在干态条件下, 当Fe³⁺与儿茶酚基团的摩尔比为1:3 时, 黏接强度最高, 为(3.03±0.68) MPa; 在水下环境中, 当Fe³⁺与儿茶酚基团的摩尔比为1:6 时, 黏接强度最高, 为(0.65±0.10) MPa. 拉曼光谱(Raman)和紫外-可见光吸收光谱(UV-Vis)分析结果表明, Fe³⁺与儿茶酚基团可通过配位交联和氧化交联的方式增大胶体强度, 从而提高黏接强度.

High-performance Adhesive Material at Dry and Under-seawater Conditions Based on Catechol-functionalized Alternating Copolymer†

A novel catechol-functionalized alternating copolymer, poly(dopamine-alt-bisphenol A epoxy resin)P(DA-a-BAER)], was synthesized from the copolymerization between dopamine(DA) and bisphenol A epoxy resin(BAER) monomers via an epoxy-amino click reaction. The resultant alternating copolymer was used as an adhesive material, of which the bonding performances both at dry and under-seawater conditions were investigated with the usage of FeCl₃ as cross-linker. The results showed that P(DA-a-BAER) could achieve excellent bonding strength on various substrates both at dry and under-seawater conditions. Taking stainless steel as an example, a bonding strength of (3.03±0.68) MPa was achieved at atmospheric situation with a 1:3 molar ratio of Fe³⁺ to catechol groups; an under-seawater bonding strength of (0.65±0.10) MPa was achieved when the molar ratio of Fe³⁺ to catechol groups reached 1:6. The crosslinking mechanism of Fe³⁺ was studied by Raman spectrometry and UV-Vis absorption spectrometry, demonstrating that catechol moieties underwent oxidation crosslinking and coordination crosslinking processes. As a result, the cohesion strength of the polymer was enhanced, leading to a high bonding strength.