Effects of nanosilica filler surface modification and compatibilization on the mechanical, thermal and microstructure of PP/EPR blends

Gharzouli, Nora; Doufnoune, Rachida; Riahi, Farid; Bouchareb, Samir

doi:10.1080/01694243.2018.1539157

Cited by 11 publications

(3 citation statements)

References 42 publications

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“…Up to now, core–shell rubber particles (CSRPs) have been widely used to toughen PP. − Using different core–shell structures to toughen PP has been studied extensively. For example, the core–shell structure of toughened PP can use PE as the core and EPR as the shell, , silicon dioxide-EPDM core–shell particles, and so on. − The addition of core–shell particles and the formation of a ternary blend system, according to the theoretical model proposed by Wu, can simultaneously improve the toughness and reduce the modulus loss in composite materials. Meanwhile, the particular core–shell structure provides more possibilities in selecting the core and shell. − As a typical two-phase modifier, it opens a new path for designing and synthesizing stiffness–toughness balanced materials.…”

Section: Introductionmentioning

confidence: 99%

A Strategy to Develop Homo-polypropylene Composites with High Impact and High Rigidity

Wang,

Gao,

Jin

et al. 2024

Macromolecules

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One of the significant drawbacks of polymer toughening is the trade-off between improved toughness and reduced rigidity. Based on our previous research (Li et al. Polymer, 2020, 191, 122237), to produce rubber particle-toed polymer composites with high impact and low rigidity loss, it is best to have a high modulus for the core and a low modulus for the shell. The question is whether we can construct high-impact polymer composites while maintaining or increasing their rigidity by increasing the core modulus. Here, SiO2/POE core–shell particles are used to toughen the polymer composites. According to theoretical analysis, the modulus of the composites can be much higher than that of the polymer matrix. Additionally, the rigidity of the PP composites is greatly influenced by the composition of the core (SiO2) and shell (POE) materials, as well as the amount of SiO2/POE core–shell particles. Experimentally, a PP composite with a high impact and high rigidity is successfully fabricated. The notched impact strength is 44.6 kJ/m2, and the flexural modulus is 1644 MPa, consistent with the theoretical calculations. To the best of our knowledge, this is the highest-performing PP composite with excellent impact strength and rigidity.

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Section: Introductionmentioning

confidence: 99%

A Strategy to Develop Homo-polypropylene Composites with High Impact and High Rigidity

Wang,

Gao,

Jin

et al. 2024

Macromolecules

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“…The practically unlimited possibilities of combining organic and inorganic substances enable production of a wide range of new hybrid materials whose properties and applications will depend on the raw materials used in the synthesis [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Silica Nanoparticles on the Thermal and Mechanical Properties of Crosslinked Hybrid Composites

et al. 2021

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This paper presents the synthesis and physicochemical characterization of a new hybrid composite. Its main goals are evaluating the structure and studying the thermal and mechanical properties of the crosslinked polymeric materials based on varying chemical properties of the compounds. As an organic crosslinking monomer, bisphenol A glycerolate diacrylate (BPA.GDA) was used. Trimethoxyvinylsilane (TMVS) and N-vinyl-2-pyrrolidone (NVP) were used as comonomers and active diluents. The inorganic fraction was the silica in the form of nanoparticles (NANOSiO2). The hybrid composites were obtained by the bulk polymerization method using the UV initiator Irqacure 651 with a constant weight ratio of the tetrafunctional monomer BPA.GDA to TMVS or NVP (7:3 wt.%) and different wt.% of silica nanoparticles (0, 1, 3%). The proper course of polymerization was confirmed by the ATR/FTIR spectroscopy and SEM EDAX analysis. In the composites spectra the signals correspond to the C=O groups from NVP at 1672–1675 cm−1, and the vibrations of Si–O–C and Si–O–Si groups at 1053–1100 cm−1 from TMVS and NANOSiO2 are visible. Thermal stabilities of the obtained composites were studied by a differential scanning calorimetry DSC. Compared to NVP the samples with TMVS degraded in one stage (422.6–425.3 °C). The NVP-derived materials decomposed in three stages (three endothermic effects on the DSC curves). The addition of NANOSiO2 increases the temperature of composites maximum degradation insignificantly. Additionally, the Shore D hardness test was carried out with original metrological measurements of changes in diameter after indentation in relation to the type of material. The accuracy analysis of the obtained test results was based on a comparative analysis of graphical curves obtained from experimental tests. The values of the changes course of similarity in the examined factors, represented by those of characteristic coefficients were determined based on the Fréchet’s theory.

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“…14 Reinforcement with nanosilica significantly improved dynamic characteristics as well as mechanical, barrier, thermal and impact properties in Ethyelene Propylene Rubbers (EPR). 15 The surface modification of nanosilica also enhanced the non-linear viscoelastic behavior (Payne effect) of nanosilica filled rubber by decreasing the de bonding of polymer chains from filler interface. 16 Hegazi et al 6 studied the effect of silane modified nanosilica on acrylonitrile butadiene rubber in resisting gamma radiation.…”

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confidence: 99%

Synergistic enhancement of mechanical, viscoelastic, transport, thermal, and radiation aging characteristics through chemically bonded interface in nanosilica reinforced EPDM‐CIIR blends

Ashok

Prakash

Deepika

et al. 2020

J of Applied Polymer Sci

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The study investigates the influence of bis(3‐triethoxysilylpropyl)tetrasulfide (TESPT) grafted nanosilica (NS) reinforcement on the mechanical, viscoelastic, thermal, and transport characteristics as well as behavior after exposure to different cumulative γ‐radiation doses of EPDM‐CIIR blends for application in nuclear and hydrocarbon environments. The tensile strength and modulus of the nanocomposites were enhanced upto 64% and 118%, respectively whereas solvent diffusion coefficient reduced by 22%. The degradation onset temperature improved from 485°C for unfilled blends to 503°C for the nanocomposites. γ‐radiation aging resistance of EPDM‐CIIR blends improved with incorporation of nanosilica, with blends containing 7.5phrNS showing optimum properties and radiation aging resistance. The property improvements are attributed to the dispersion of NS and chemically interfaced covalent linkages between SiO2‐EPDM/CIIR chains that provides large interfacial area for effective stress transfer and creates barrier to free radical and solvent permeation. The applicability of Korsmeyer‐Peppas, Peppas‐Sahlin, and Higuchi models to predict of sorption behavior are investigated. Coats‐Redfern and Horowitz‐Metzger models were employed to evaluate the activation energy for thermal degradation. Slight decline in properties at higher nanofiller contents was due to the formation of agglomerates. TEM, FTIR, and rheological curves were utilized to corroborate these observations. FTIR and ESR analysis provided insight on the chemical changes in the nanocomposites after irradiation.

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Effects of nanosilica filler surface modification and compatibilization on the mechanical, thermal and microstructure of PP/EPR blends

Cited by 11 publications

References 42 publications

A Strategy to Develop Homo-polypropylene Composites with High Impact and High Rigidity

A Strategy to Develop Homo-polypropylene Composites with High Impact and High Rigidity

The Influence of Silica Nanoparticles on the Thermal and Mechanical Properties of Crosslinked Hybrid Composites

Synergistic enhancement of mechanical, viscoelastic, transport, thermal, and radiation aging characteristics through chemically bonded interface in nanosilica reinforced EPDM‐CIIR blends

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