Preparation of pH Sensitive Crosslinkers in Polymer Brushes
Students: Anna Joost Støckler
Supervisors: Kim Daasbjerg
Project description: Dopamine-M3+ type complexes will be synthesized to exploit their pH responsive crosslinker abilities. In particular, it is interesting to study, if such complexes can be used to harden polymer brushes of poly(glycidyl methacrylate) (PGMA) prepared on either glassy carbon or stainless steel surfaces. Once the target surfaces are prepared the pH responsiveness is addressed.
Aim/Hypothesis: To create pH sensititve dopamine based crosslinkers and use them to cure an epoxy resin in terms of PGMA brushes
Method: The synthesis of PGMA brushes will follow a classical SI-ATRP methodology, where the radical initiators are produced on glassy carbon or stainless steel surfaces using electrografting of aryldiazonium salts. Afterwards these modified surfaces are exposed to dopamine-M3+ complexes to let their amine groups react with the oxirane groups in the PGMA brushes. Ellipsometry and IRRAS are used to follow the individual steps. Finally, the effect of exerting the resulting surfaces to various pH conditions will reveal to which extent the pH responsiveness of the dopamine-M3+ complex works.
Perspectives: The promises of pH responsive crosslinkers are enormous from an industrial point of view, since these should pave the way for introducing reversible and reusable adhesives.