Preparation and properties of poly(aryl ether nitrile)composite reinforced by dual dynamic bond
The dynamic boroxine crosslinked poly(aryl ether nitrilene)(PEN-COOH-B3 O3)/polyethylpyrroli-done(PVPON)composites were prepared by the covalent/non-covalent co-enhancement of dynamic boroxine and hydrogen bonds.The mechanical properties,shape memory function,thermal stability,self-healing proper-ties and recycling properties of the composites were characterized and studied by means of universal tensile tes-ting machine,differential scanning calorimeter and other instruments.The strength of the composite prepared by the hydrogen bond between PEN-COOH-B3O3/PVPON can reach 102.5 MPa,the elastic modulus can reach 3 455.7 MPa,and the glass transition temperature can reach 180.3 ℃.The addition of dynamic boron-oxygen bond made the composite have excellent solvo-assisted self-healing and recovery properties.The healing efficien-cy reached 98.7％after 24 h of self-healing at room temperature(25 ℃),and there was no loss of mechanical properties after five cycles of recovery.At the same time,the composite exhibits good shape memory behavior by utilizing the stimulus response of dynamic boroxine bond.
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维普
