Nucleobase Self-Assembly in Supramolecular Adhesives
作者:Shijing Cheng、Mingqiang Zhang、Ninad Dixit、Robert B. Moore、Timothy E. Long
DOI:10.1021/ma202122r
日期:2012.1.24
Novel acrylic monomers functionalized with nucleobase-containing units (adenine and thymine) were prepared upon aza-Michael addition and successfully copolymerized with n-butyl acrylate. At a content of 7 mol %, adenine-containing units self-assembled into needle-like microstructures within amorphous polymer matrices as shown with atomic force microscopy (AFM), small-angle X-ray scattering (SAXS), and wide-angle X-ray diffraction (WAXD); thymine-containing units did not aggregate into distinct morphologies even to 30 mol %. Upon blending, thymine- and adenine-containing statistical copolymers associated into a thermodynamically stable complex, which was physically cross-linked through adenine-thymine base pairing. The molar fractions of the nucleobase monomer, nucleobase stacking interactions, and complementary hydrogen bonding principally influenced self-assembly. Additionally, the nucleobase-functionalized polyacrylates exhibited tunable adhesive and cohesive strength.
Pressure-sensitive adhesive utilizing molecular interactions between thymine and adenine
simple pressure‐sensitive adhesion (PSA) system incorporating noncovalent interactionbetweenthymine and adenine is presented. A copolymer having thymine moieties is combined with a low‐molecular‐weight bifunctional adenine cross‐linker. Molecularinteractions caused by multiple hydrogen bonds between the thymine and adenine units are evaluated by FT‐IR spectral measurement. Mechanical properties of