Structure and flame retardant properties of RAFT-grafted cotton fabrics based on adenosine monophosphate
Grafted flame retardant cotton fabrics(Cell-g-P A AMP)were prepared by graft polymerization onto pristine cotton fabrics via reversible addition-fragmentation chain transfer free radical polymerization(RAFT)method based on cellulose-based dithioester RAFT chain transfer agent(Cell-CTA),initiator of azodiisobutyronitrile and flame retardant monomer of modified adenosine monophosphate(AAMP).Fourier transform infrared spectroscopy,scanning electron microscopy and Raman spectroscopy were used to characterize chemical structure,surface morphology of Cell-g-PAAMP,morphology and graphitization degree of carbon residue of Cell-g-PAAMP after burning.The flame retardant properties and physical mechanical properties of Cell-g-PAAMP were analyzed by thermal gravimetric analyzer,limit oxygen index instrument,fabric strength tester and air permeability tester.The appearance of stretching vibration peak of P=O at 1 199 cm-1 verified the preparation of Cell-g-PAAMP.The results of scanning electron microscopy and Raman spectroscopy showed a coarse surface of Cell-g-PAAMP with attached granular substance,enhanced graphitization degree,complete form and dense structure of carbon residue of Cell-g-PAAMP after burning.Compared with pure cotton fabric,Cell-g-PAAMP has a lower initial decomposition temperature,improved thermal stability and increased ultimate oxygen index,with good flame retardant effect.The permeability and breaking strength of Cell-g-PAAMP decreased,but the elongation at break increased significantly.
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