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>Effect of weak intermolecular interactions in micro/nanoscale polyphosphazenes and polyethylene terephthalate composites on flame retardancy
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Effect of weak intermolecular interactions in micro/nanoscale polyphosphazenes and polyethylene terephthalate composites on flame retardancy
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机译：Effect of weak intermolecular interactions in micro/nanoscale polyphosphazenes and polyethylene terephthalate composites on flame retardancy
This study investigates the effects of weak intermolecular interactions on the flame retardancy of a poly(ethylene terephthalate) (PET) and polyphosphazene flame retardant. Monodispersed poly‐(cyclotriphosphazene‐co‐4,4′‐sulfonyldiphenol) (PZS) microspheres with different diameters were synthesized by controlling the reactant concentration. Simulation studies revealed that the weak intermolecular interactions between PZS and PET predominantly include strong hydrogen bonding and π–π interactions. The weak intermolecular interactions imparted high thermal stability, even in the molten state, and PZS microspheres with smaller diameters achieved stronger hydrogen bonds and π–π interactions with PET. The diameter of the PZS microspheres influenced the limiting oxygen index value and UL‐94 rating. Increasing the carbon residue alone was insufficient to promote the flame retardancy, and the weak intermolecular interactions played an important role. Thus, stronger weak‐intermolecular‐interactions are beneficial for realizing a material with superior flame retardancy and anti‐dropping performance.
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