Ultrafine hydrotalcite particles prepared with novel technology to improve the flame retardancy of polypropylene

Xu, Sheng; Liao, Meng-Chen; Zeng, Hong‐Yan; Zhang, Zhiqing; Liu, Xiaojun; Zhu, Peihan

doi:10.1016/j.clay.2015.02.032

Cited by 30 publications

(16 citation statements)

References 27 publications

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“…Freshly-prepared LDH materials showed the structure corresponding to the natural mineral hydrotalcite (JCPDS: 22-0700 [34,35,36], Figure 2a). After thermal treatment (Figure 2b), the diffraction patterns showed characteristic reflections that corresponded to the periclase phase (JCPDS: 00-042-1022), and for samples containing Zn, zincite phase was also observed (ZnO) (JCPDS: 00-036-1451) [37,38,39].…”

Section: Resultsmentioning

confidence: 99%

Thermal Stability Evaluation of Polystyrene-Mg/Zn/Al LDH Nanocomposites

et al. 2019

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A series of samples of Mg/Zn/Al LDHs (layered double hydroxides) materials was prepared by the co-precipitation and urea hydrolysis methods. They were modified with organic surfactants (acrylate and oleate anions) and characterized by X-ray diffraction, which corroborated the intercalation of anionic species into the interlayer space. The hydrophobized materials were incorporated at low contents (10 and 15 wt.%) to polystyrene, which was synthesized by emulsion polymerization techniques. The polymeric composites were analyzed by thermogravimetry to determine the decomposition temperature. The results demonstrated that the materials with Zn presented the greatest increment in the degradation temperature (7 °C < T < 54 °C). Moreover, the Friedman, Flynn–Wall–Ozawa, and Coats–Redfern models were compared to obtain the kinetic parameters of degradation process. The obtained order of decomposition of the Coats–Redfern model showed that the decomposition process occurs in at least two stages. Finally, the addition of environmentally friendly modified Layered Double Hydroxides (LDH) nanomaterials to the polystyrene (PS) matrix allowed for obtaining polymeric composites with higher thermal stability, retarding the decomposition process of PS.

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Section: Resultsmentioning

confidence: 99%

Thermal Stability Evaluation of Polystyrene-Mg/Zn/Al LDH Nanocomposites

et al. 2019

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“…The interest in the fabrication of polymer composites containing hydrotalcite is attributed to the excellent FRM properties of this material, such as significant water release due to its thermal dehydration and the related endothermic effect. Many investigations focused on the analysis of thermal properties of hydrotalcite at different conditions and fabrication of polymer-hydrotalcite composites [ 14 , 15 , 16 ]. It was found that thermal decomposition of hydrotalcite results in mass loss of 43%, which is related to the release of H 2 O and CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Poly(Methyl Methacrylate) Coatings Containing Flame Retardant Additives from Suspensions in Water-2-Propanol

Wang

Sakib

et al. 2021

Molecules

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A dip-coating technique is designed for deposition of poly(methyl methacrylate) (PMMA) from water/2-propanol mixture, avoiding the use of traditional toxic solvents. Solutions of PMMA macromolecules with high molecular weight (MW) are obtained for a water/2-propanol ratio of 0.15–0.33 and the solubilization mechanism is discussed. The ability to use concentrated PMMA solutions and high MW of the polymer are the key factors for the successful dip coating deposition. The coating mass for 10 g L−1 polymer solutions shows a maximum at a water/2-propanol ratio of 0.25. The deposition yield increases with the polymer concentration increase and with an increasing number of the deposited layers. PMMA deposits protect stainless steel from aqueous corrosion. The coating technique allows for the fabrication of composite coatings, containing flame-retardant materials (FRMs), such as commercial halloysite, huntite, hydrotalcite, and synthesized Al(OH)3, in the PMMA matrix. The FRM content in the coatings is modified by variation of the FRM content in colloidal suspensions. A fundamentally new method is developed, which is based on the salting out aided dispersive extraction of Al(OH)3 from the aqueous synthesis medium to 2-propanol. It is based on the use of hexadecylphosphonic acid molecules as extractors. The method offers advantages of reduced agglomeration.

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“…Recently, polymer/layered silicate composites have been studied widely . The researches focus on the crystallization of the polymer matrix, the flame retardant and mechanical properties of the composite materials.…”

Section: Introductionmentioning

confidence: 99%

“…Up to date, the used layered silicates are mainly montmorillonite (MMT), a hydrotalcite and dihydrogen layered compounds . Actually, as a member of the four most important clay minerals, illite is another most common minerals in sedimentary rocks .…”

Section: Introductionmentioning

confidence: 99%

The influence of illite on the crystallization and properties of isotactic polypropylene

Song

Sun

et al. 2019

Polymer Crystallization

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The iPP/illite composites with varied content of illite were prepared and the influence of illite on the crystallization kinetics, crystalline morphology, and mechanical property of iPP was investigated. It is found that the illite exhibits obvious nucleation ability toward iPP in its α‐form. A 1 wt% of illite leads to an increment of iPP crystallinity from 33% to 50%. Moreover, the crystallization of iPP has been accelerated remarkably. Tensile test shows that the addition of illite also improves the mechanical properties of iPP. A 1 wt% illite leads to an enhancement of modulus of iPP from 1.4 GPa to 1.9 GPa, whereas the tensile strength increases from 30.5 to 37.1 MPa. The above‐mentioned influence of illite on the iPP depends on its content. This has been correlated to the aggregation of illite in the iPP matrix with increasing amount, which reduces the aspect ratio and specific surface area of illite.

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Ultrafine hydrotalcite particles prepared with novel technology to improve the flame retardancy of polypropylene

Cited by 30 publications

References 27 publications

Thermal Stability Evaluation of Polystyrene-Mg/Zn/Al LDH Nanocomposites

Thermal Stability Evaluation of Polystyrene-Mg/Zn/Al LDH Nanocomposites

Poly(Methyl Methacrylate) Coatings Containing Flame Retardant Additives from Suspensions in Water-2-Propanol

The influence of illite on the crystallization and properties of isotactic polypropylene

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