Thermal degradation of epoxy–silica organic–inorganic hybrid materials

Macan, Jelena; Brnardić, Ivan; Orlić, Sebastijan; Ivanković, Hrvoje; Ivanković, Marica

doi:10.1016/j.polymdegradstab.2005.04.024

Cited by 96 publications

(49 citation statements)

References 17 publications

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“…The evaluation of the IPDT showed that the thermal stability of the composites in creases with the content of the inorganic filler, independently of the type of filler (annealed at 700 C or at 900 C). Although an improvement of the organic matrix thermal stability may be ex pected solely by the fact that silica has an inherent high thermal stability [68], the inhibition of the matrix decomposition during the calcination process has been also attributed to a mass transfer barrier effect of the insulating filler [69] and to an improved adhesion at the filler/matrix interphase [70]. This improvement is consistent with the Tg increment observed by DSC.…”

Section: Tablesupporting

confidence: 76%

Magnetic silica:epoxy composites with a nano- and micro-scale control

Crespo

González

Pozuelo

2014

Materials Chemistry and Physics

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This is a postprint version of the following published document:Crespo, M., González, M. y Pozuelo, J. (2014) h i g h l i g h t s g r a p h i c a l a b s t r a c tWe present a strategy that permits the nanoscale and micro scale con trol through a simple protocol. Cu Ni ferrites were prepared into the structure pores if commercial silica with a size control by annealing temperature.Composites with epoxy matrix wereThe reinforcements provided an increase in glass transition temperature and decomposition temperature of the composites.Multiscale composites with magnetic properties were prepared by incorporating Cu Ni nanoferrites filled silica microparticles in an epoxy matrix. The size of the nanoferrites was controlled both by the structure of the silica template and the annealing temperature (700 and 900 C) used during the syn thesis procedure. The ferrite:silica particles prepared at 700 C showed a narrow size distribution close to 8.3 nm with a superparamagnetic behaviour. A less symmetric size distribution was obtained when annealing was performed at 900 C, with diameters ranging from 15 to 80 nm. The reinforcement incorporation increased up to 7 C the glass transition temperature and 30 C the decomposition tem peratures of the composites. The proposed strategy permits the nanoscale control, by the trapping effect of the silica on the magnetic nanoparticles, as well as the control of the micro scale distribution through a simple protocol. These composites could have potential applicability as EMI shielding materials, owing to their magnetic nature, lightweight and enhanced thermal stability.

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Section: Tablesupporting

confidence: 76%

Magnetic silica:epoxy composites with a nano- and micro-scale control

Crespo

González

Pozuelo

2014

Materials Chemistry and Physics

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“…The main reason to select these methodologies instead of isothermal procedures is due to simplicity and to take in advance the conventional non-isothermal TGA curves that are employed in some steps optimisation in PIM processes. Although non-isothermal approaches have several limitations in their use to ascertain kinetics parameters, they are frequently used to study the kinetics of charged polymers [12,13]. These methods are based on studying the degree of conversion with respect to temperature at different heating rates.…”

Section: Thermal Degradation Kinetics In Nitrogen Atmospherementioning

confidence: 99%

Thermal stability and degradation kinetics of feedstocks for powder injection moulding – A new way to determine optimal solid loading?

Hidalgo

Jiménez-Morales

Torralba

2013

Polymer Degradation and Stability

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Degradation kinetics and the thermal stability of zircon powder injection moulding feedstocks (PIM) based on cellulose acetate butyrate (CAB) and polyethylene glycol (PEG) binders were investigated using simultaneous thermogravimetric analysis (STA). The initial decomposition temperature (IDT) and the integral procedure decomposition temperature (IPDT) were used to analyse the thermal stability of the binder system as a function of the solid loading content. The degradation kinetics was studied, and the degradation activation energy was assessed for varying zircon powder contents using isoconversional methods. All the methodologies revealed changes in the thermal degradation behaviours of the feed-stocks for solid loadings that were previously determined to correspond to optimal solid loadings using other experimental procedures. These results may promote the proposal of thermodynamic degradation studies of feedstocks as an alternative or complementary technique to determine optimal solid loading contents in powder injection moulding (PIM). The studies in this paper also examined PIM process operation temperatures for zircon feedstocks.

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“…If the activation energy does not vary greatly with the conversion, it is possible to describe the whole mechanism by a single empirical kinetic model even if the real mechanism is complex. [13] In this case, E is approximately constant in the conversion range from 0.3 to 0.8.…”

Section: Resultsmentioning

confidence: 89%

Mechanism of Thermal Degradation of an Inorganic‐Organic Hybrid Based on an Epoxy‐POSS

Montero

Rico

Torres

et al. 2008

Macromolecular Symposia

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Summary: A novel inorganic-organic hybrid material, belonging to the family of polyhedral oligomeric silsesquioxanes (POSS), was used to reduce the trend of a conventional epoxy-amine system to undergo combustion. The mixtures with different percentages in weight of POSS, and equal number of equivalents between of epoxy and amino groups were tested by thermogravimetic analysis (TGA) in both, argon and oxygen atmospheres. The results indicated that the char/ceramic yield values increase with the content of POSS and therefore, fire resistance is enhanced. Activation energies of degradation processes were obtained by Kissinger-AkahiraSunose method. An empirical kinetic model satisfactorily explained the degradation mechanism of different blends.

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Thermal degradation of epoxy–silica organic–inorganic hybrid materials

Cited by 96 publications

References 17 publications

Magnetic silica:epoxy composites with a nano- and micro-scale control

Magnetic silica:epoxy composites with a nano- and micro-scale control

Thermal stability and degradation kinetics of feedstocks for powder injection moulding – A new way to determine optimal solid loading?

Mechanism of Thermal Degradation of an Inorganic‐Organic Hybrid Based on an Epoxy‐POSS

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