Oxidative behavior of polymers by thermogravimetric analysis, differential thermal analysis and pressure differential scanning calorimetry

Riga, Alan T.; Collins, Ricardo; Mlachak, Gregory

doi:10.1016/s0040-6031(98)00530-9

Cited by 41 publications

(23 citation statements)

References 5 publications

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“…28 PC is susceptible to varities of chemical process by thermal and oxidative degradation mechanism at elevated temperature during melt processing. [29][30][31][32][33][34][35] PC can be modified and tailored by blending with other polymers for use in demanding applications particularly when its processability and impact strength is important. 36 Researchers 37,38 have made attempts to blend PC with Acrylonitrile-Butadiene-Styrene copolymer (ABS) to modify the properties of PC for commercial application.…”

Section: Introductionmentioning

confidence: 99%

Retracted: Mechanical and thermal properties enhancement of polycarbonate nanocomposites prepared by melt compounding

Nayak

Mohanty

Samal

2010

J of Applied Polymer Sci

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Polycarbonate (PC)/layered silicate nanocomposites were prepared by melt blending technique followed by injection molding from sodium montmorillonite (Na þ -MMT) and a series of organoclay (OMMT-I, Cloisite 20A, and Cloisite15A). The effect of clay types on the mechanical, morphological, and thermal behavior of PC matrix has been investigated. The structure and morphology of the nanocomposites were determined by wide angle Xray diffraction and transmission electron microscopy. Morphological observation revealed that the organoclay platelets are best exfoliated in PC/Cloisite15A nanocomposites whereas Na þ -MMT clay platelets are poorly dispersed in PC/Na þ -MMT nanocomposites. Differential scanning calorimetry results showed the existence of glass transition temperature (T g ) of PC and the nanocomposites. Thermogravimetric analysis indicated that the increase in onset decomposition temperature of nanocomposites mainly depend on the type of clay and organic modifier. The effect of organoclay on the storage modulus (E 0 ), loss modulus (E 00 ), and damping factor (tan d) as a function of temperature was measured by dynamic mechanical analysis.

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Section: Introductionmentioning

confidence: 99%

Retracted: Mechanical and thermal properties enhancement of polycarbonate nanocomposites prepared by melt compounding

Nayak

Mohanty

Samal

2010

J of Applied Polymer Sci

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“…Regarding thyme and oregano essential oils, their antimicrobial activity is due to the high amount of carvacrol and thymol in their composition [42,43]. Other studies conducted in different fruits and vegetables also demonstrated the effectiveness of the constituents of different essential oils (eugenol, thymol, menthol or eucalyptol) to improve the organoleptic quality of food as well as to reduce the microbial growth, by using also a modified atmosphere [8].…”

Section: Study Of the Effectiveness Of The Active Films To Preserve Pmentioning

confidence: 99%

Carvacrol and Thymol for Fresh Food Packaging

Ramos¹,

Beltrán²

2013

J Bioequiv Availab

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Active packaging is becoming an emerging food technology to improve quality and safety of food products. One of the most common approaches is based on the release of antioxidant/antimicrobial compounds from the packaging material. In this work an antifungal active packaging system based on the release of carvacrol and thymol was optimized to increase the post-harvest shelf life of fresh strawberries and bread during storage. Thermal properties of the developed packaging material were determined by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Volatile compounds in food samples contained in active packaging systems were monitored by using headspace solid phase microextraction followed by gas chromatography analysis (HS-SPME-GC-MS) at controlled conditions. The obtained results provided evidences that exposure to carvacrol and thymol is an effective way to enlarge the quality of strawberries and bread samples during distribution and sale.

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“…The polymer starts to melt are shown by endothermic peak at 370°C which is characteristics of melting temperature 32 .…”

Section: Differential Scanning Calorimetry:-mentioning

confidence: 99%

ELECTRICAL CONDUCTIVITIES OF SYNTHESIZED POLY o- PHENYLENEDIAMINE AND ITS NANOCOMPOSITES.

Deepa¹,

JayaShanthi²

2017

IJAR

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Poly (o-Phenylenediamine) and their metal oxide nanocomposites using different concentrations like 5%, 10% and 15% of SiO 2 nanoparticles were synthesized by chemical oxidative polymerization method using ammonium persulphate as an oxidant in the presence of HCl. The formation of polymers and their nanocomposites were confirmed from the UV-Vis and FT -IR spectroscopy. The formation of Poly (o-Phenylenediamine) nanocomposites were confirmed by the change of polymer colour from red to brown and found to exhibit band at 446nm in UV-visible spectroscopy. The crystalline nature of the synthesized polymers and their nanocomposites were determined from the XRD studies. The SEM images of the polymers recorded at different magnification shows rod like structure and found to change to flake like structures in the polymer nanocomposites synthesized at different concentration of SiO 2 nanoparticles. The TEM recorded at different angle confirms the core shell structures. The stability of the synthesized polymer and its nanocomposites were substantiated from thermal studies carried out using TGA, DTA and DSC. The comparative electrical conductivities of the polymer and its nanocomposites shows that the polymer nanocomposites exhibit higher conductivities compared to the polymer and the electrical conductivity was found to be higher for the polymer nanocomposite synthesized with 15% of SiO 2 . The polymer and its nanocomposites show semiconducting nature.

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Oxidative behavior of polymers by thermogravimetric analysis, differential thermal analysis and pressure differential scanning calorimetry

Cited by 41 publications

References 5 publications

Retracted: Mechanical and thermal properties enhancement of polycarbonate nanocomposites prepared by melt compounding

Retracted: Mechanical and thermal properties enhancement of polycarbonate nanocomposites prepared by melt compounding

Carvacrol and Thymol for Fresh Food Packaging

ELECTRICAL CONDUCTIVITIES OF SYNTHESIZED POLY o- PHENYLENEDIAMINE AND ITS NANOCOMPOSITES.

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