Further studies on polystyrene/cerium (IV) oxide system: melt blending and interaction with montmorillonite

Cai, Guipeng; Xu, Shaorong; Wang, Zhengzhou; Wilkie, Charles A.

doi:10.1002/pat.3226

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…The ability of CeO 2 to release and take up oxygen facilitates its application in the processes where oxygen plays a decisive role, e.g., in vehicle exhaust emission control [ 12 ], in solid-oxide fuel cells [ 13 ] and even in the protection of living cells against the detrimental effects of UV-radiation [ 14 ] and oxidative stress [ 15 ]. Furthermore, nanoceria affects a number of physico-chemical properties of polymers of technical use, viz thermal stability [ 16 ], mechanical strength [ 17 ], optical absorbance [ 18 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Polyimide-Based Nanocomposites with Binary CeO2/Nanocarbon Fillers: Conjointly Enhanced Thermal and Mechanical Properties

et al. 2020

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To design novel polymer materials with optimal properties relevant to industrial usage, it would seem logical to modify polymers with reportedly good functionality, such as polyimides (PIs). We have created a set of PI-based nanocomposites containing binary blends of CeO2 with carbon nanoparticles (nanocones/discs or nanofibres), to improve a number of functional characteristics of the PIs. The prime novelty of this study is in a search for a synergistic effect amidst the nanofiller moieties regarding the thermal and the mechanical properties of PIs. In this paper, we report on the structure, thermal, and mechanical characteristics of the PI-based nanocomposites with binary fillers. We have found that, with a certain composition, the functional performance of a material can be substantially improved. For example, a PI containing SO2-groups in its macrochains not only had its thermal stability enhanced (by ~20 °C, 10% weight loss up to 533 °C) but also had its stiffness increased by more than 10% (Young’s modulus as high as 2.9–3.0 GPa) in comparison with the matrix PI. In the case of a PI with no sulfonic groups, binary fillers increased stiffness of the polymer above its glass transition temperature, thereby widening its working temperature range. The mechanisms of these phenomena are discussed. Thus, this study could contribute to the design of new composite materials with controllable and improved functionality.

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Section: Introductionmentioning

confidence: 99%

Polyimide-Based Nanocomposites with Binary CeO2/Nanocarbon Fillers: Conjointly Enhanced Thermal and Mechanical Properties

et al. 2020

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“…Nevertheless, its application is limited not only at higher temperature due to its poor thermal stability, but also due to its relatively resistant for UV light. The combination of PMMAmatrixwith inorganic materials (i.e, metal oxides) such as CeO 2 [13], TiO 2 [14,15],ZrO 2 [16,17], ZnO [18,19] and silica [20], are resulting in new and often unique properties.Among of them,the thermal stabilityand optical properties in the UV-rays region are improved. Nowadays, the metal oxides in nanoscales,especially with PMMA polymer exhibit an excellent candidate for flame retardancey, electrical behavior, antimicrobial activity and UV-blocking.…”

Section: Introductionmentioning

confidence: 99%

High-performance of nanoparticles and their effects on the mechanical, thermal stability and UV-shielding properties of PMMA nanocomposites

et al. 2017

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T HE TARGET of this work is to choose a suitable nanoparticle for preparing a highly ultraviolet (UV)-shielding from poly (methylmethacrylate) (PMMA) nanocomposites at low concentration and to decrease the destructive effects of UV radiation. Morphologies of the synthesized nanoparticles were investigated by X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM). Whereas, pure PMMA and its nanocomposites were characterized by using dynamic mechanical analysis (DMA), tensile testing, UV-visible spectra (T%), and thermogravimetric analysis (TGA). The obtained results showed a good correlation between the tensile properties, DMA and TGA analysis depending on the type of nanoparticles used in the PMMA matrix, especially in case of ZrO 2 and ZnO. Furthermore, UV-vis spectra were analyzed ranging from 200 nm to 800 nm. It showed that UV radiation is significantly blocked from 100% to 0.2 % in the UV range between 200 nm and 360 nm for pure PMMA and to 0.08 % for PMMA/CeO 2 nanocomposite and to 0.01 % for PMMA/ CeO 2 with various types of nanoparticles. After 360 nm, pure PMMA and PMMA/CeO 2 were a little bit affected by UV lights, whereas the PMMA based on different nanoparticles was not affected. This result demonstrates that these nanocomposites could be strongly candidates for the sunscreens or for several fields that related to the UV photodegradation effects.

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“…Similar abilities have been found in rare earth compounds . Recently, researchers used CeO 2 , CeO 2 combined with other metal oxides, or CeO 2 ‐modified graphene to improve thermostability and flame retardancy of thermoplastic polyurethane, polystyrene, or epoxy resin; however, the improvement in flame retardancy is not obvious; specifically, the peak heat release rate (PHRR) decreases by only 8% to 23%, and the initial ignition time (TTI) is shortened by 50 seconds …”

Section: Introductionmentioning

confidence: 77%

Phosphorus‐free boron nitride/cerium oxide hybrid: A synergistic flame retardant and smoke suppressant for thermally resistant cyanate ester resin

Feng

Yuan

Liang

et al. 2019

Polymers for Advanced Techs

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Establishing a phosphorus-free strategy to fabricate high-performance thermosetting resins owning outstanding thermal resistance, good flame retardancy, and smoke suppression is important for sustainable development. Herein, a unique phosphorus-free hybrid (BN@CeO 2 ) was synthesized through chemically grafting cerium oxide (CeO 2 ) on surface of exfoliated boron nitride (BN) nanosheet with the aids of γ-aminopropyltriethoxysilane and polydopamine coating, which was then embedded into bisphenol A cyanate ester (BCy) resin to fabricate new BN@CeO 2 /BCy composites with high thermal resistance. Compared with BCy resin, the BN@CeO 2 /BCy composite with 4 wt% BN@CeO 2 not only has delayed initial ignition time by 23 seconds but also severally shows 58.1%, 23.1%, and 44.4% lower smoke produce rate, total heat release, and peak heat release rate. The study on mechanism behind outstanding flame retardancy reveals that the improved heat resistance and flame retardancy of BN@CeO 2 /BCy composite are attributed to multiply effects induced by BN@CeO 2 and its interaction with BCy resin; specifically, these effects come from BN (physical barrier) and CeO 2 (free radical trapping effect and catalytic char layer formation) as well as those from the synergistic effect of BN and CeO 2 . These excellent comprehensive properties of BN@CeO 2 /BCy composites demonstrate that BN@CeO 2 is an environment-friendly and synergistic modifier for developing heat-resisting thermosetting resins with outstanding flame retardancy and smoke suppression. KEYWORDS cyanate ester, flame retardant, phosphorus free, smoke suppression, synergistic effect 1 | INTRODUCTION Thermally resistant and high flame-retarding resins are urgently needed by many cutting-edge fields such as aeronautics and astronautics, 1 high speed and high frequency printed circuit boards, 2,3 C-class insulation, 4 and so on; unfortunately, few polymers have desirable flame retardancy. 5 Up to now, being as the most efficient halogen-free flame retardants, 6 various phosphorus-containing flame retardants were synthesized and employed to fabricate flame-retardant polymers. 7,8 However, incorporating phosphorus-containing flame retardants often degrades the heat resistance of thermally resistant resins 9-11 and also brings potential environmental problems because of the enrichment of phosphorus. 12 Therefore, preparing halogen-free and phosphorus-free flame retardants is meaningful for both industry and academy. Inorganic flame retardants, such as metal hydroxides, 13 layered double hydroxide (LDH), 14 and borate, 15 are commonly used as halogen-free and phosphorus-free flame retardants, but they also have obvious drawbacks. Specifically, very large content of metal hydroxides (approximately 60 wt%) should be used to get desirable

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Further studies on polystyrene/cerium (IV) oxide system: melt blending and interaction with montmorillonite

Cited by 7 publications

References 8 publications

Polyimide-Based Nanocomposites with Binary CeO2/Nanocarbon Fillers: Conjointly Enhanced Thermal and Mechanical Properties

Polyimide-Based Nanocomposites with Binary CeO2/Nanocarbon Fillers: Conjointly Enhanced Thermal and Mechanical Properties

High-performance of nanoparticles and their effects on the mechanical, thermal stability and UV-shielding properties of PMMA nanocomposites

Phosphorus‐free boron nitride/cerium oxide hybrid: A synergistic flame retardant and smoke suppressant for thermally resistant cyanate ester resin

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