Polymerization mechanism and properties of flame-retardant and antibacterial polyamide 66 by in-situ polymerization
Polyamide 66(PA66)has been an important research subject in materials science due to its excellent mechanical strength and thermal stability.However,the limited flame retardancy and antibacterial properties of PA66 restrict its broader applica-tions.Therefore,a flame-retardant and antibacterial PA66(FAPA66)was successfully prepared via in-situ polymerization,using PA66 salt as the base material and combining reactive flame retardant[(6-oxo-6 h-dibenzo(c,e)(1,2)oxophosphacyclohexyclo-6-methyl)]succinic acid hexanediamine salt(DPDA)with ZnO/Au@Cu2O ternary heterojunction antibacterial agent.The synthesis of multifunctional materials were prepared by one-step polymerization method,and the polymerization mechanism and performance characteristics were thoroughly investigated.Analysises of the polymerization mechanism show that the activation energy of the modified FAPA66 is 372.95 kJ/mol,an increase of 97.56 kJ/mol compared to pure PA66.Meanwhile,the apparent rate constant is 29.3 g/(mol·min),a reduction of 16.2 g/(mol·min)compared to pure PA66.This indicates that additional thermal compensation and extended polymerization time are required to provide more energy for the copolymerization reaction during the synthesis of the FAPA66,thereby promoting the reaction and increasing the molecular weight of the polymer.In terms of performance,PA66 materi-als containing 5wt%DPDA flame retardant and 0.12wt%ZnO/Au@Cu2O heterojunction antibacterial agent exhibite good flame retardancy and antibacterial properties.Its limiting oxygen index reaches 30%,and achieves a V-0 rating in the vertical burning test.Additionally,antibacterial tests show that the material has a 93.1%antibacterial rate against Escherichia coli and a 91.2%antibacteri-al rate against Staphylococcus aureus.
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