Polypropylene/Mg3Al–tartrazine LDH nanocomposites with enhanced thermal stability, UV absorption, and rheological properties

Qiang Wang; Jingwen Wu; Yanshan Gao; Zhang Zhang; Junya Wang; Xi Zhang; Xingru Yan; Ahmad Umar; Zhanhu Guo; Dermot O'Hare

doi:10.1039/C3RA44452J

Polypropylene/Mg₃Al–tartrazine LDH nanocomposites with enhanced thermal stability, UV absorption, and rheological properties

Qiang Wang,*^a Jingwen Wu,^a Yanshan Gao,^a Zhang Zhang,^a Junya Wang,^a Xi Zhang,^b Xingru Yan,^b Ahmad Umar,^cd Zhanhu Guo^b and Dermot O'Hare*^e

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* Corresponding authors

^a College of Environmental Science and Engineering, Beijing Forestry University, 35 Qinghua East Road, Haidian District, Beijing 100083, P. R. China
E-mail: qiang.wang.ox@gmail.com, qiangwang@bjfu.edu.cn
Tel: +86 13699130626

^b Integrated Composites Laboratory, Dan F Smith Department of Chemical Engineering, Lamar University, Beaumont, USA

^c Department of Chemistry, College of Science and Arts, Najran University, P.O. Box 1988, Najran-11001, Kingdom of Saudi Arabia

^d Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, P.O. Box 1988, Najran-11001, Kingdom of Saudi Arabia

^e Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford, UK
E-mail: dermot.ohare@chem.ox.ac.uk
Tel: +44 (0)1865 272686

Abstract

We report the synthesis of coloured polypropylene (PP)/Mg₃Al–tartrazine layered double hydroxide (LDH) nanocomposites with enhanced thermal stability, UV absorption capacity, and rheological properties using a modified solvent mixing method for the first time. SEM images indicated that the LDH nanoparticles were evenly dispersed within the PP matrix due to the favourable interactions between PP and LDHs. TGA and DSC analysis indicated that the thermal stability of PP/LDH nanocomposites was significantly increased. Decreased G′ and G′′ ascribed to the enhanced mobility (relaxation) of the confined polymer chains at the interface of the PP/LDH layers suggested that the LDH is nano-dispersed in the composites. UV-Vis spectroscopy showed that the addition of Mg₃Al–tartrazine LDH significantly enhanced the UV absorption characteristics of PP. Since tartrazine is a nontoxic additive, these coloured PP/Mg₃Al–tartrazine LDH nanocomposites are expected to have many promising applications such as for food packing and children's toys, etc.

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Polypropylene/Mg₃Al–tartrazine LDH nanocomposites with enhanced thermal stability, UV absorption, and rheological properties

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Polypropylene/Mg₃Al–tartrazine LDH nanocomposites with enhanced thermal stability, UV absorption, and rheological properties

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