Naseem Sajid, Lonkar Sunil P, Leuteritz Andreas, Labuschagné Frederick J W J
Leibniz-Institut für Polymerforschung Dresden e.V Hohe Straße 6 Dresden 01069 Germany
Department of Chemical Engineering, Khalifa University Abu Dhabi United Arab Emirates.
RSC Adv. 2018 Aug 22;8(52):29789-29796. doi: 10.1039/c8ra05447a. eCollection 2018 Aug 20.
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.
在本研究中，探索了使用层状双氢氧化物（LDHs）作为聚丙烯（PP）的紫外线（UV）光保护添加剂。制备了不同的LDHs，如ZnTi、ZnSn、ZnGa、ZnCr和CdCr LDHs，并对它们的紫外线吸收特性进行了表征。ZnTi LDHs显示出比其他四种金属组合更高的紫外线吸收，并进一步用十二烷基苯磺酸钠（SDBS）和月桂酸（LA）进行了有机改性。制备了聚丙烯（PP）与四种不同类型LDHs（ZnTi、ZnSn、ZnTi-SDBS和ZnTi-LA）的纳米复合材料，浓度为5%。通过广角X射线光谱（WAXS）和紫外可见（UV-vis）吸收光谱对所有LDHs金属组合的结晶度和层状结构进行了表征，并通过扫描电子显微镜（SEM）研究了它们的晶体形态。通过热重分析（TGA）、透射电子显微镜（TEM）及其光氧化行为分析了纳米复合材料和纯PP的分解及热性能。添加这些有机改性和未改性的LDHs显示出PP热分解的显著变化。通过添加SDBS改性的ZnTi LDHs（重量比5%），PP的热稳定性提高到约70°C，并且确定诱导时间增加了约300%。
