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Title Phytic acid modified boron nitride nanosheets as sustainable multifunctional nanofillers for enhanced properties of poly(l-lactide)
Date 16.01.2020
Number 58219
Abstract A sustainable multifunctional nanofiller (f-BNNSs) based on boron nitride nanosheets and biobased phytic acid was prepared using (·-aminopropyl) triethoxysilane as a coupling agent. The structure of f-BNNSs was analyzed systematically using Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and elemental mapping. The influence of f-BNNSs on the crystallinity, polymorphism, crystallization kinetics, thermal stability, thermal conductivity, and flame retardant properties of poly(l-lactic acid) (PLLA) was systematically investigated. f-BNNSs show remarkable nucleating effects on the crystallization of PLLA, and the crystallization rate increases with increasing f-BNNSs loading. Upon addition of 20 wt % of f-BNNSs, the crystallization half-time of PLLA/f-BNNSs nanocomposite decreases from 12.0 to 1.0 min at 130 °C compared to PLLA. The presence of f-BNNSs in PLLA/f-BNNSs nanocomposites favors the formation of ordered a form irrespective of the loadings of f-BNNSs. Thermal stability and thermal conductivity of PLLA increased significantly due to the strong interfacial interactions between hydroxyl groups of f-BNNSs and the carboxyl groups of PLLA. The presence of phosphorus, nitrogen, silicon, and carbon elements in f-BNNSs improves the char forming capability of f-BNNSs leading to the enhancement of the flame retardancy of PLLA in PLLA/f-BNNSs nanocomposites. The limiting oxygen index (LOI) value of neat PLLA is 18.5% and it increases to 27.5% for PLLA nanocomposites containing 20 wt % of f-BNNSs. This work provides a new strategy toward the development of environmentally friendly multifunctional nanofiller for PLLA.
URL https://doi.org/10.1021/ACSSUSCHEMENG.9B06158
Publisher ACS Sustainable Chemistry & Engineering
Identifier
Citation ACS Sustainable Chemistry & Engineering 8 (2020) 1868-1878
DOI https://doi.org/10.1021/ACSSUSCHEMENG.9B06158
Authors Rosely, C. V. S. ; Joseph, A.M. ; Leuteritz, A. ; Gowd, E. B.
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