Improvement of thermal stability of polypropylene using DOPO-immobilized silica nanoparticles

Dong, Quanxiao; Ding, Yanfen; Wen, Bin; Wang, Feng; Dong, Huicong; Zhang, Shimin; Wang, Tongxin; Yang, Mingshu

doi:10.1007/s00396-012-2631-0

Cited by 52 publications

(38 citation statements)

References 52 publications

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“…Some studies have shown the interest of the surface modification of silica by DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) compared with the simultaneous addition of silica and DOPO on thermal stability of PP [34]. Dong et al pointed out the synergistic effect of 3.2 wt% of DOPO immobilized on silica nanoparticles (5 wt% in PP) with an enhancement of the thermal stability of 90 C under air.…”

Section: Introductionmentioning

confidence: 98%

Effect of phosphorous-modified silica on the flame retardancy of polypropylene based nanocomposites

Courtat

Mélis

Taulemesse

et al. 2015

Polymer Degradation and Stability

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International audienceSurface modification of various silicas by phosphorous agents was carried out with the aim to use these particles as flame retardant additive in a polypropylene matrice (PP) at low content (10 wt%). Thermal and flammability properties of PP/modified silica (PP-Tm-10%, PP-Zm-10%) were studied using TGA, PCFC and cone calorimeter and compared to those conferred by pure silica (PP-T-10%, PP-Z-10%). Quite surprisingly the untreated fillers induce the most significant reduction of peak of Heat Release Rate (50% decrease) while the surface modification by phosphorous agents does not lead to the expected effect on the fire behavior of PP composite. This phenomenon was related to the morphology and rheological behavior of the various PP composites. Indeed, the higher the storage modulus at low frequencies is, the better the fire behavior is, because of the induced barrier effect. Moreover, the addition of non modified silicas leads to a decrease of 10 s of the TTI. This phenomenon was related to the formation of bubbles after the PP melting during cone calorimeter test

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Section: Introductionmentioning

confidence: 98%

Effect of phosphorous-modified silica on the flame retardancy of polypropylene based nanocomposites

Courtat

Mélis

Taulemesse

et al. 2015

Polymer Degradation and Stability

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“…Presence of hydroxyl groups on the surface of SiO 2 NPs and high surface area cause silica aggregates [18]. Double layer surface modification of SiO 2 NPs with CA as the first layer and AA as the second is a novel method and it can prevent the SiO 2 NPs from aggregation.…”

Section: Resultsmentioning

confidence: 99%

Application of SiO2 nanoparticles with double layer coverage consist of citric acid and l(+)-ascorbic acid for the production of poly(vinyl chloride)/SiO2 nanocomposite films with enhanced optical and thermal properties

Mallakpour

Naghdi

2015

Polym. Bull.

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Incorporation of SiO 2 nanoparticles (NPs) into poly(vinyl chloride) (PVC) matrix to prepare PVC/SiO 2 nanocomposites (NCs) can enhance its properties. To achieve improved properties for the NCs, NPs should be dispersed properly and be compatible within the polymer matrix. Therefore, to prevent SiO 2 NPs from aggregation, surface modification of NPs was performed by citric acid (CA) and L(?)-ascorbic acid (AA) as biological and environmental friendly coating layers for the first time. This process was carried out under ultrasonic irradiation condition, which is an economical and eco-friendly tool. After that three different amounts of modified SiO 2 (SiO 2 -CA-AA) were inserted into PVC matrix and PVC/ SiO 2 -CA-AA NCs were prepared using solution casting method. The structures and morphology of the prepared NC films were verified by several techniques including Fourier transfer infrared, X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, ultraviolet-visible (UV-Vis) spectroscopy and tensile testing. Thermogravimetric analysis confirmed the presence of about 13 wt% modifiers on the surface of SiO 2 . Microscopic observations showed good dispersity of SiO 2 -CA-AA NPs in the polymer matrix. Resulting NC films showed more flexibility than pure PVC.

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“…Chen et al [20] reported that nanosilica reacted with the reactive antioxidant via transesterification to form a nanosilica hybrid material, the nanosilica-immobilized antioxidant was homogeneously dispersed into the matrix and the aging-resistance ability of polypropylene was improved. Dong et al [21] prepared 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-immobilized silica nanoparticles, which could improve the dispersion of inorganic nanoparticles and the thermal stability of iPP. Tang et al [9] described that with the addition of zinc oxide nanoparticles coated with organic nucleating agents, the crystallization temperature of iPP increased by an additional 7 ° C relative to iPP, with only organic nucleating agents and nonspherulitic birefringent textures in iPP were observed.…”

Section: Introductionmentioning

confidence: 99%

The effect of hybrid nanoparticle with silica sol as the supporter on the crystallization behavior and mechanical properties of isotactic polypropylene

Qin

et al. 2015

Journal of Polymer Engineering

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Colloidal dispersions of hybrid nanoparticles with silica sol as the supporter (PKSol) were prepared by supporting aromatic phosphate on silica sol via a chemical action with γ -aminopropyltrimethylsilane (KH550) as a linker in wet process for the first time. Dynamic light scattering (DLS) demonstrated that hybrid nanoparticles with an average size of about 200 nm were formed and transmission electron microscopy (TEM) confirmed the presence of the ultrafine silica sols within the hybrid particles, which exhibited " currant-bun " particle morphologies, rather than typical " core-shell " structures for most polymer-encapsulated silica particles. Compared to aromatic phosphate alone and silane-modified silica sol, the effect of PKSol on the crystallization behavior and mechanical properties of isotactic polypropylene (iPP) was investigated using a polarized optical microscope (POM) and differential scanning calorimetry (DSC). The results demonstrated that PKSol showed superior nucleating ability on iPP than the other two. After adding 0.2 wt% PKSol, the crystallization peak temperature of iPP increased from 116.35 ° C to 120.81 ° C and the crystallinity increased from 39.6% to 50%. Correspondingly, the haze decreased from 37.6% to 23.3% and mechanical properties were improved.

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Improvement of thermal stability of polypropylene using DOPO-immobilized silica nanoparticles

Cited by 52 publications

References 52 publications

Effect of phosphorous-modified silica on the flame retardancy of polypropylene based nanocomposites

Effect of phosphorous-modified silica on the flame retardancy of polypropylene based nanocomposites

Application of SiO2 nanoparticles with double layer coverage consist of citric acid and l(+)-ascorbic acid for the production of poly(vinyl chloride)/SiO2 nanocomposite films with enhanced optical and thermal properties

The effect of hybrid nanoparticle with silica sol as the supporter on the crystallization behavior and mechanical properties of isotactic polypropylene

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