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Baode Zhang

 

Baode Zhang

Liaoning Petrochemical Univeristy,China

Abstract Title: The crosslinking behaviors tune the performances of PMR polyimide matrix of advanced carbon fiber composites

Biography:

Baode Zhang has completed his postdoctoral studies University of Freiburg Institute of Physics. He is the board member of China Mainland Region of Society for the Advancement of Materials and Process Engineering. He has published more than 50 papers in reputed journals and has been serving as an editorial board member of repute.

Research Interest:

Advanced fiber reinforced polyimide matrix composites are achieving acceptance as engineering materials for the design and fabrication of high performance aerospace structural components. The addition-type polyimides known as PMR (in situ polymerization of monomer reactants) polyimides has been developed as laminating resins for high temperature carbon fiber reinforced composites. The monomers are essentially unreactive at room temperature, but undergo sequential in situ condensation and are thermally imidized to generate well defined polyimide oligomers that are endcapped with terminated groups. The condensation reaction forming low molecular weight oligomers occurs in the temperature range of 121-232°C, and then ring-opening addition crosslinking reactions at even high temperatures form a thermo-oxidatively stable polyimide matrix resin. Polyimide oligomers can undergo diverse addition copolymerization or homopolymerization, such as reverse Diels Alder reaction and cyclotrimerization. This paper discuss the crosslink mechanism of current status of PMR polyimides with different reactive capping reagents. In order to explain the capping reagents on the thermal properties, molecular dynamic (MD) simulation is carried out to investigate the glass transition temperature (Tg) of different PMR polyimides from PMR-15, AFR-700B and novel PMR polyimides. MD results indicate that the addition copolymerization or homopolymerization of oligomers occurred at elevated temperature leads to diverse 3D crosslinking structures, which tailor the Tg and thermal stability. Therefore, exploring the crosslink chemistry mechanism of oligomers with reactive capping reagents with the assistance of MD simulation is of significance in design high performance PMR polyimides.