Abstract
Functional phenylboronic-and hydrazide-containing N -isopropyl acrylamide based diblock polymer, and ketone-and glucose group-containing acrylamide based diblock polymer, were prepared by the reversible addition-fragmentation chain transfer (RAFT) polymerization. The structure and properties of the copolymers were studied, and doubly dynamic hydrogel was prepared under different conditions. The main driving force of gel formation is the acylhydrazone bond formed by the hydrazine and ketone group, and the boronate ester bond formed by the boronic acid and glucose group. Under acidic conditions, the acylhydrazone bond ensures the rapid formation kinetics and good self-healable ability of the hydrogel. Under neutral or weak alkaline conditions, the active boronate ester bond endows the hydrogel with fast gelation kinetics and maintains the gel state, while the stable acylhydrazone bond can enhance the mechanical strength of the hydrogel gradually. Under alkaline conditions, the two dynamic covalent bonds are synergistic, giving the hydrogel multiple responsiveness and macroscopically self-healable ability.
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