Effect of organically intercalation modified layered double hydroxides-graphene oxide hybrids on flame retardancy of the
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Effect of organically intercalation modified layered double hydroxides‑graphene oxide hybrids on flame retardancy of thermoplastic polyurethane nanocomposites Long Li1 · Kangjia Jiang1 · Yi Qian2 · Haoyue Han1 · Peng Qiao2 · Haiming Zhang1 Received: 8 October 2019 / Accepted: 1 January 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract Flame retardant thermoplastic polyurethane (TPU) nanocomposites were prepared by melt blending using organically intercalation modified layered double hydroxides-graphene oxide hybrids (LDHs-GO). Modification process of LDHs-GO was carried out by using sodium dodecyl sulfate (SDS) in water/ethanol medium. X-ray diffraction, Fourier transform infrared spectra and scanning electron microscope micrograph results showed the SDS intercalation modified LDHs-GO (SDSLDHs-GO) was synthesized successfully. Flame retardancy, suppression smoke and thermal stability properties of the welldispersed TPU nanocomposites were evaluated and compared with each other. The CCT results showed that the pHRR was significantly decreased after incorporating SDS-LDHs-GO nanoparticles. In particular, the pHRR of the TPU5 containing 20 mass% SDS-LDHs-5%GO hybrid was decreased by 77.2% compared to that of pure TPU. The addition of SDS-LDHs-GO hybrids can enhance the suppression smoke performance of TPU nanocomposites as well, and the efficiency was dependent on the catalytic carbonization of lamellar LDHs and both the adsorption and barrier effect of GO. The TG results confirmed that GO can improve the thermal stability of nanocomposites by promoting char formation. This work provides a novel modification strategy for enhancing the dispersion and flame retardant efficiency of LDHs. Keywords Thermoplastic polyurethane · Layered double hydroxides · Graphene oxide · Sodium dodecyl sulfate · Flame retardancy
Introduction As promising polymer composites, polymer/layered crystal nanocomposites have recently attracted considerable interest in the field of flame retardant polymers, due to their remarkably improved thermal stability and gas permeability, such as polyethylene/montmorillonite system [1], polyurethane/ hexagonal boron nitride system [2], polystyrene/molybdenum disulfide system [3], etc. In recent years, a new
* Long Li [email protected] * Yi Qian [email protected] 1
College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
2
promising class of inorganic layered material and layered double hydroxides (LDHs), since their excellent physicochemical properties, have been widely applied in absorbents [4], catalysts [5], electrode materials [6], ion exchangers [7], fire retardants materials [8], etc. LDHs are also referred to as anionic clays or hydrotalcites, a class of 2D nano-structure with positively charged host layers and counter-anions found in the inter[layer space. The general ]x+ chemical formula of LDHs is M(II)1−x M(III)x (OH)2 (Y
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