The aim of this study is to investigate the effect of the contents of modified 3, 4-dihydroxyphenyl-L-alanine （DOPA）, named as do- pamine methacrylamide （DMA）, on the adhesion of mussel-inspired adhesives in air and water. A series of adhesives, p（DMA-co-MEA）, were synthesized by copolymerized DMA and methoxy ethylacrylate （MEA） with the content of DMA from 2 mol.% to 10 mol.%. Results of IH NMR show that the contents of DMA in all adhesives are near to the theory ratios of DMA in the staring reagents. Adhesives with more than 5 mol.% of DMA appear adhesion, while adhesives with 2 mol. % and 3 mol. % of DMA show almost no adhesion in air and water. Adhesive with 7 mol.% of DMA has the highest molecular weight and adhesion either in air or in water in all adhesives. Adhesion of adhesive is synergistically influenced by the content of DMA, molecular weight and elastic modulus of adhesive. It is because that higher content of DMA would provide more DOPA, which leads to the coordination bond between DOPA and metal ions. It is feasible to develop the mussel-inspired adhesive through incorporating DMA into polymers, which will have potential application in the clinic.
The synthesis of mesoporous material SBA-15 has been extensively reported in the past decades, which possesses a pore diameter of 6-8 nm on average. Here, a simple post-synthesis procedure has been developed to synthesize SBA-15 with further expanded pore diameter to above 10 nm simply by a solvothermal treatment replacing traditional hydrothermal step for mesopore template removal, which results in efficient pore expansion and the significantly promoted condensation of silica framework as well. This facile approach is believed applicable for pore expansions of other kinds of mesoporous silica materials.
