Filling natural microtubules with Triphenyl phosphate (cas 115-86-6) for flame-retarding polymer composites

Add time:08/23/2019    Source:sciencedirect.com

Phosphorus flame retardants can provide polymers with flame retardancy, but they often compromise the polymers’ mechanical performance due to plasticization. This problem is addressed in this study by filling and sealing Triphenyl phosphate (cas 115-86-6) into natural microtubules of ∼100 µm in length, 10–20 µm in diameter and 0.5–1.0 µm in wall thickness. We investigated the sealing mechanisms through morphological observation and X-ray photoelectron spectroscopy. An appropriate mixture of triphenyl phosphate and cellulose acetate at mass ratio of 97:3 created an encapsulation effect which prevented triphenyl phosphate from flowing out of the tubules during curing, which resulted in an encapsulation ratio of 56%. Adding the filled tubules into an epoxy resin showed no obvious compromise on the stiffness and strength of the matrix. The tubules proved effective in increasing char and reducing smoke release during combustion. This self-sealing method may be used in other applications such as self-healing composites.

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