Different transition metal combinations of LDH systems and their organic modifications as UV protecting materials for polypropylene (PP)

In this research, the use of layered double hydroxides (LDHs) as ultraviolet (UV) light-protecting additives for PP is explored. Different LDHs, such as ZnTi, ZnSn, ZnGa, ZnCr and CdCr LDHs, were prepared and their UV absorptions were characterized. The ZnTi LDHs showed higher UV absorption than the...

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Bibliographic Details
Published in:RSC advances 2018-01, Vol.8 (52), p.29789-29796
Main Authors: Naseem, Sajid, Lonkar, Sunil P, Leuteritz, Andreas, Labuschagné, Frederick J. W. J
Format: Article
Language:English
Subjects:
Additives
Chemistry
Crystal morphology
Hydroxides
Lauric acid
Nanocomposites
Oxidation
Polypropylene
Scanning electron microscopy
Spectrum analysis
Thermal decomposition
Thermal stability
Thermodynamic properties
Thermogravimetric analysis
Transmission electron microscopy
Ultraviolet spectroscopy
Weight
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Summary:In this research, the use of layered double hydroxides (LDHs) as ultraviolet (UV) light-protecting additives for PP is explored. Different LDHs, such as ZnTi, ZnSn, ZnGa, ZnCr and CdCr LDHs, were prepared and their UV absorptions were characterized. The ZnTi LDHs showed higher UV absorption than the other four metallic combinations and were further organically modified with dodecylbenzene sodium sulfonate (SDBS) and lauric acid (LA). Nanocomposites of polypropylene (PP) with four different types of LDHs, ZnTi, ZnSn, ZnTi-SDBS and ZnTi-LA, were prepared at concentrations of 5%. The crystallinities and layered structures of all the metallic combinations of LDHs were characterized by wide angle X-ray spectroscopy (WAXS) and ultraviolet visible (UV-vis) absorption spectroscopy, and their crystal morphologies were studied by scanning electron microscopy (SEM). The decomposition and thermal properties of the nanocomposites and pure PP were analyzed by thermogravimetric analysis (TGA) and transmission electron microscopy (TEM) and by their photo-oxidation behavior. The addition of these organically modified and unmodified LDHs showed significant changes in the thermal decomposition of PP. The thermal stability of PP was increased to around 70 °C by the addition of SDBS-modified ZnTi LDHs (5% by weight), and an increase in induction time of about 300% was determined. In this research, the use of layered double hydroxides (LDHs) as ultraviolet (UV) light-protecting additives for PP is explored.
ISSN:2046-2069
2046-2069
DOI:10.1039/c8ra05447a