Preparation and Self-healing Properties of New Aliphatic Polycarbonate Elastomers with Physical Crosslinking and π-π-Conjugated Synergy
To improve the life of materials,using physical cross-linking interaction to develop self-healing elastomers is one of the effective ways.However,the mechanical properties and self-healing properties of the elastomers are contradictory.In this study,5-methyl-5-benzyloxycarbonyl dimethylene carbonate(MBC)and 5-methyl-5-(4-nitro)benzyloxycarbonyl dimethylene carbonate(MNBC)were first prepared,and then the target materials were obtained by ring-opening polymerization with mPEG and MBC and MNBC,and the best preparation process was determined.The chemical structure and thermal behavior of aliphatic monomers and polycarbonate were characterized by infrared spectroscopy,nuclear magnetic resonance spectroscopy and differential scanning calorimetry(DSC).The crosslinking mechanism of aliphatic polycarbonate forming gel was discussed.The transition from linear polymer to network elastomer is controlled by adjusting the ratio of initiator to monomer,the ratio between monomers and the reaction temperature.Meanwhile,the swelling behavior,gel content,swelling rate,water content and mechanical properties of the elastomer were characterized by means of equilibrium swelling method and dynamic thermodynamic analysis.In addition,the bending experiment verifies that the elastomer has a certain shape memory performance,and the scratch experiment verifies that the elastomer has a good room temperature Self-healing performance.
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万方数据
维普
