Improving the Thermal Behavior of Poly(propylene) by Addition of Spherical Silica Nanoparticles

Palza, Humberto; Vergara, Rodrigo C.; Zapata, Paula Andrea

doi:10.1002/mame.201000162

Cited by 44 publications

(59 citation statements)

References 33 publications

(75 reference statements)

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“…The amount of residue obtained under air at 600 C is the same than that obtained under nitrogen for all samples, which suggests that no char is formed with the addition of pure and modified silicas. In their studies, Palza et al [18] confirm that with 5 wt% of spherical silica nanoparticles, the thermal degradation of PP is considerably improved under air (increase of pMLR temperature of 70 C) in comparison to tests carried out under nitrogen (increase of pMLR temperature of 10 C). The authors show that the thermal degradation is slightly delayed by adding a compatibilizer (PP-g-MA) (z10 C and z30 C under inert and oxidative atmosphere respectively) which may prove that the dispersion plays a role on the thermal stability.…”

Section: Thermal Behaviormentioning

confidence: 87%

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: Thermal Behaviormentioning

confidence: 87%

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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“…[19][20][21][22][23] Moreover, the nanocomposites may show additional specific properties if the fillers are properly designed, i.e. 37 For this reason, inorganic nanoparticles bearing a polymer stabilizer shell can better disperse in PLGA matrix and reduce the phase separation processes, 38,39 and eventually can affect the polymeric matrix degradation and hence the silver release. 24 Metal nanoparticles have attracted great interest for their unique optical, electrical, catalytic, and biomedical properties.…”

Section: Introductionmentioning

confidence: 99%

Integrated PLGA–Ag nanocomposite systems to control the degradation rate and antibacterial properties

Rinaldi

Fortunati

Taddei

et al. 2013

J of Applied Polymer Sci

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Biodegradable polymer based nanocomposite materials have attracted much attention since they can be used for biomedical and pharmaceutical applications. In order to have highly integrated PLGA nanocomposite materials, silver colloidal nanoparticles were prepared in chloroform starting from silver nitrate and using polyvinylpyrrolidone as reduction and capping agent. TEM and AFM imaging give information on the size distribution of the silver nucleus (7.0 nm) and the capping shell (8.2-10.7 nm). PLGA-Ag nanocomposites were prepared upon addition of 1 or 3% wt of silver nanoparticles to the PLGA/chloroform suspension. The effect of silver loading on polymer degradation was studied following the mass loss and the morphology of nanocomposite films at different degradation stages. The concentrations of Ag 1 , which is released during nanocomposite degradation, were monitored and analyzed through the diffusion model, to have insight on the degradation kinetics. The release rate, and likely the degradation rate, was reduced at higher silver loading. Bacterial growth tests indicated that the cell growth is inhibited in the presence of PLGA-Ag nanocomposites and the efficiency is correlated to Ag 1 release. Thus, controlling the nanoparticle loading, a tunable degradation and antibacterial action can be designed.

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“…It was suggested there was synergistic effect for the DOPO-immobilized SiO 2 nanoparticles. It is known that SiO 2 can improve stability due to physical effect [42, 43]. This could be explained by the fact that DOPO-immobilized SiO 2 nanoparticles could induce carbonization and form thermally-stable char, and therefore to reduce releasing rate of degradation volatiles [20, 44].…”

Section: Resultsmentioning

confidence: 99%

“…It was reported that the silanol groups on the surface of SiO 2 could catalyze the thermal degradation [38, 42, 43], thus the apparent activation energies were lower than that of pure PP. The degradation products could be adsorbed on the surface of the SiO 2 nanoparticles [1, 42], so the apparent weight loss was slow. For the PP/SiO 2 –WD70–DOPO (5 wt%) nanocomposite, E α increased linearly as the degradation proceeded, which was very different from that of PP and PP/SiO 2 nanocomposite (5 wt%).…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2012

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After the surface silylation with 3-methacryloxypropyltrimethoxysilane, silica nanoparticles were further modified by 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). The immobilization of DOPO on silica nanoparticles was confirmed by Fourier transform infrared spectroscopy, UV–visible spectroscopy, magic angle spinning nuclear magnetic resonance, and thermogravimetric analysis. By incorporating the DOPO-immobilized silica nanoparticles (5 wt%) into polypropylene matrix, the thermal oxidative stability exhibited an improvement of 62 °C for the half weight loss temperature, while that was only 26 °C increment with incorporation of virgin silica nanoparticles (5 wt%). Apparent activation energies of the polymer nanocomposites were estimated via Flynn–Wall–Ozawa method. It was found that the incorporation of DOPO-immobilized silica nanoparticles improved activation energies of the degradation reaction. Based on the results, it was speculated that DOPO-immobilized silica nanoparticles could inhibit the degradation of polypropylene and catalyze the formation of carbonaceous char on the surface. Thus, thermal stability was significantly improved.

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Improving the Thermal Behavior of Poly(propylene) by Addition of Spherical Silica Nanoparticles

Cited by 44 publications

References 33 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

Integrated PLGA–Ag nanocomposite systems to control the degradation rate and antibacterial properties

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

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