Fabrication And Study Of Rapid Self-healing Poly(N-methacryloyl Glycinamide) Hydrogels

Fabrication of rapid room temperature self-healing hydrogels remains a challenge.In this thesis,we prepared an N-methacrylamide glycyanamide(MNAGA)monomer by the reaction of glycine amide hydrochloride and methacryloyl chloride.We used this monomer to prepare PMNAGA hydrogels by thermal initiated polymerization.The PMNAGA hydrogels possessed good mechanical properties and the strength of the gels increased with an increment of solid content.The tensile strength of the hydrogels could be up to 0.2 MPa.Besides,PMNAGA hydrogels also showed a good self-healing ability.The strength of healed sample could be restored to 80% of original sample within one minute and the strength could recover 100% initial value within 24 hour.This excellent healing ability was attributed to the disturbance of methyl to dual amide hydrogen bonds.The melting temperature scope of the gels was wide,resulting in tunable gel-sol and sol-gel transition in response to temperature change.We demonstrated the influence of methyl on the hydrogen bond strength by FTIR and DLS.These tests could explain the mechanism of self-healing process.The results of Gaussian calculation simulations were also consistent with the experimental results.In this work,we prepared a rapid self-healing hydrogel and studied the mechanism of self-healing process of hydrogels.This mechanism offers a new approach to fabricating self-healing hydrogels.