An investigation into sintering of PA6 nanocomposite
Sep 01 2012 · Experimental TMA results indicate that the sintering of PA6 and PA6 nanocomposites occurs in two different steps namely powder coalescence and void removal. Furthermore TMA analysis showed that relevant degradation phenomena occur during the sintering of PA6 and PA6 nanocomposites leading to gas formation in the molten polymer.
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(PDF) Thermo-oxidative infection in populations of EPDM
(iv) The formation of volatile species evolved during the oxidation transmitted in the gas phase to adjacent particles.Dierent paths for the spreading are illustrated in Fig. 3. At a high extent of oxidation the degradation will lead to a transition from rubbery to viscous state with tackiness¯ow and particle sintering.
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Thermo-Oxidative Degradation Of Polyamide 6
The thermo-oxidative degradation of unstabilized polyamide 6 (PA-6) was investigated by a number of novel techniques in an attempt to achieve a better understanding of the mechanisms involved in the oxidative degradation of polymers. Particular attention was given to the influence of end groups on PA-6 oxidation by
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Destruction of cellulose during the process of sintering
On heat-treatment of unsintered PTFE fibres initially a thermo-oxidative destruction takes place and then a pyrolysis of the matrix polymer (cellulose) with simultaneous sintering of the Teflon particles. The end of PTFE sintering coincides in time with the end of the cellulose degradation process. A carbonized residue in the amount of 1.5–2.5 of the fibre weight remains in the yarn.
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SinteringWikipedia
Sintering or frittage is the process of compacting and forming a solid mass of material by heat or pressure without melting it to the point of liquefaction.. Sintering happens naturally in mineral deposits or as part of a manufacturing process used with metals ceramics plastics and other materials.The atoms in the materials diffuse across the boundaries of the particles fusing the
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Review on the thermo-oxidative degradation of polymers
factors determining the thermo-oxidative degradation of neat (unstabilized) polymers during processing and in their service life. Tab. 1. Life time requirement of polymers for several application
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Thermal and Oxidative Degradation of Polymers
Thermal and Oxidative Degradation of Poly(methyl metha-crylate) Weight Loss Macromolecules 18 (1985). 4 Atsushi Inaba and Takashi Kashiwagi A Calculation of Thermal Degradation Initiated by Random Scission. 1. Steady-State Radical Concentration Macromolecules 19 (1986). 5 Atsushi Inaba and Takashi Kashiwagi A
Chat OnlineThermo-Oxidative Degradation Of Polyamide 6
The thermo-oxidative degradation of unstabilized polyamide 6 (PA-6) was investigated by a number of novel techniques in an attempt to achieve a better understanding of the mechanisms involved in the oxidative degradation of polymers. Particular attention was given to the influence of end groups on PA-6 oxidation by
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Thermal and Oxidative Degradation of Polymers
Thermal and Oxidative Degradation of Poly(methyl metha-crylate) Weight Loss Macromolecules 18 (1985). 4 Atsushi Inaba and Takashi Kashiwagi A Calculation of Thermal Degradation Initiated by Random Scission. 1. Steady-State Radical Concentration Macromolecules 19 (1986). 5 Atsushi Inaba and Takashi Kashiwagi A
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Factors influencing Sinter and Sintering ProcessIspatGuru
Jul 08 2013 · Reduction degradation indexThe RDI is a very important parameter which serves to predict the degradation behaviour of the sinter in the lower part of the BF stack. Sinter degradation during reduction at low temperature is normally determined by the RDI static test which is carried out at 550 deg C. Low values of RDI is desirable.
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Influence of degradation behavior of polyamide 12
to thermal and thermo-oxidative degradation of PA 12 powder a wide range of process relevant material parameters occur. The aging state depends mainly on the building chamber s temperature and the duration of building. The following investigations show the time dependent aging behavior of PA 12 laser melting powder.
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Degradation of polyamide 11 in rotational moulding
At the internal surface the degradation is predominantly thermo-oxidative leading to the formation of carbon dioxide carboxylic acids and conjugated unsaturated oligo-enimines (UV–vis-active
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Materials Free Full-Text Field-Assisted Sintering
Gadolinium-Doped Ceria (GDC) is a prospective material for application in electrochemical devices. Free sintering in air of GDC powder usually requires temperatures in the range of 1400 to 1600 °C and dwell time of several hours. Recently it was demonstrated that sintering temperature can be significantly decreased when sintering was performed in reducing atmosphere.
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BEHAVIOR AND MATERIAL PROPERTIES OF PA12
Abstract Selective mask and laser sintering are powder based additive manufacturing technologies which allow the production of complex parts layer-by-layer. Due to the high building chamber temperature during processing a physical and chemical degradation of the used plastic powder occurs.
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BEHAVIOR AND MATERIAL PROPERTIES OF PA12
Abstract Selective mask and laser sintering are powder based additive manufacturing technologies which allow the production of complex parts layer-by-layer. Due to the high building chamber temperature during processing a physical and chemical degradation of the used plastic powder occurs.
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(PDF) Review on the thermo-oxidative degradation of
May 26 2008 · During processing as well as in service life polymers degrade. For the majority of polymers this is due to oxidative processes. In this review the mechanism of the thermo-oxidative degradation of
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Products Formed During Thermo-oxidative Degradation of
May 19 2009 · Oxidative degradation of cholesterol has been extensively researched however not all products formed have been established. When a phytosterols standard was heated at 60 120 and 180 °C for different period of time the following groups of components were detected oxidized phytosterols fragmented phytosterol molecules volatile compounds and oligomers.
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Thermo-oxidative evolution and physico-chemical
Apr 01 2020 · Thermo-oxidative degradation of mollusk shells to CaO through intermediate phase of CaCO 3 has been investigated using various analytical techniques. Powders of shells species (Dosinia exoleta and Ostrea edulis) with particle size fractions of 0.0450.125 mm 0.125–0.2 mm and 0.2–1 mm were subjected to degradation at the various heating rates (5 10 15 and 20 °C min −1).
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Polymeric Materials Review on Oxidation Stabilization and
The thermo-oxidation (or thermal-oxidation) of the macromolecular substances is defined as their thermally initiated reaction with the molecular oxygen. The general scheme of the polymers thermo-oxidation indicates the radical character of the process. (Fig. 1.2) 1 3 1012 .
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Sintering of Si3N4 Under High Nitrogen Pressure
The glass forming region in this system and the reaction products formed during sintering at 1750–1800°C were analysed. Thermo-oxidative degradation of
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Sintering or frittage is the process of compacting and forming a solid mass of material by heat or pressure without melting it to the point of liquefaction.. Sintering happens naturally in mineral deposits or as part of a manufacturing process used with metals ceramics plastics and other materials.The atoms in the materials diffuse across the boundaries of the particles fusing the
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Thermo-Oxidative Degradation Of Polyamide 6
The thermo-oxidative degradation of unstabilized polyamide 6 (PA-6) was investigated by a number of novel techniques in an attempt to achieve a better understanding of the mechanisms involved in the oxidative degradation of polymers. Particular attention was given to the influence of end groups on PA-6 oxidation by
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Thermooxidationan overview ScienceDirect Topics
The thermooxidation aging of the polymer is then manifesting as for example • Loss of moisture and residual volatiles that result in a reduction in molecular weight and a local loss of mass related to outgassing of oxidation by-products 9 .. Observable physical changes in color surface area texture and crack density may be also indicators of thermo-oxidative aging 27 .
Chat Online(PDF) Thermo-oxidative infection in populations of EPDM
(iv) The formation of volatile species evolved during the oxidation transmitted in the gas phase to adjacent particles.Dierent paths for the spreading are illustrated in Fig. 3. At a high extent of oxidation the degradation will lead to a transition from rubbery to viscous state with tackiness¯ow and particle sintering.
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Sintering of Si3N4 Under High Nitrogen Pressure
The glass forming region in this system and the reaction products formed during sintering at 1750–1800°C were analysed. Thermo-oxidative degradation of
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Thermo-oxidative evolution and physico-chemical
Apr 01 2020 · Thermo-oxidative degradation of mollusk shells to CaO through intermediate phase of CaCO 3 has been investigated using various analytical techniques. Powders of shells species (Dosinia exoleta and Ostrea edulis) with particle size fractions of 0.0450.125 mm 0.125–0.2 mm and 0.2–1 mm were subjected to degradation at the various heating rates (5 10 15 and 20 °C min −1).
Chat OnlineTECHNICAL WHITEPAPER Thermal Degradation of Plastics
of a larger group of degradation mechanisms for polymers that can occur from a variety of causes such as Heat (thermal degradation and thermal oxidative degradation when in the presence of oxygen). Light (photodegradation). Oxygen (oxidative degradation). Weathering (generally UV degradation).
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Oxygen (oxidative and thermal-oxidative degradation) Light (photodegradation) Weathering (generally UV/ozone degradation) The deterioation due to oxidation and heat is greatly accelerated by stress and exposure to other reactive compounds like ozone. All polymers will undego some degradation during
Chat OnlineThermal and Oxidative Degradation of Polymers
Thermal and Oxidative Degradation of Poly(methyl metha-crylate) Weight Loss Macromolecules 18 (1985). 4 Atsushi Inaba and Takashi Kashiwagi A Calculation of Thermal Degradation Initiated by Random Scission. 1. Steady-State Radical Concentration Macromolecules 19 (1986). 5 Atsushi Inaba and Takashi Kashiwagi A
Chat OnlineNondestructive evaluation of sintering and degradation for
Nov 01 2018 · In Fig. 8 a second group of samples was selected with similar extent of sintering but differing degrees of thermo-oxidative degradation. The resultant spectra were normalized before plotting and show an increase in the third harmonic range (frequencies from 405 to 495 kHz) related to the excitation frequencies with increasing PIAT.
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