The thermal decomposition behaviors of stearic acid, paraffin wax and polyvinyl butyral

Jaw, Kuen-Shan; Hsu, Chung‐King; Lee, Jinn-Shinng

doi:10.1016/s0040-6031(00)00680-8

Cited by 56 publications

(30 citation statements)

References 6 publications

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“…E a at the beginning of decomposition of kneaded PS is lower (%65 kJ/mol), suggesting that peroxy and/ or hydroperoxy groups are introduced by the kneading process. The activation energy for the decomposition reaction of stearic acid remains also fairly constant over the entire reaction progress and the average value of 83 kJ/mol is similar to values reported in the literature [66]. Fig.…”

Section: Experiments In Argonsupporting

confidence: 86%

Kinetic analysis of the polymer burnout in ceramic thermoplastic processing of the YSZ thin electrolyte structures using model free method

Salehi¹,

Clemens²,

Graule³

et al. 2012

Applied Energy

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Polymeric binder burnout during thermoplastic processing of yttria stabilized zirconia (YSZ) ceramics were analyzed using thermogravimetric analysis (TGA). The debinding kinetics of the stearic acid/polystyrene binder have been described using model free methods and compared with the decomposition rate of the pure polymers. The apparent activation energy E a as a function of debinding progress a was calculated in two atmospheres (argon and air) by three different methods: Ozawa-Flynn-Wall (OFW), Kissinger-Akahira-Sunose (KAS) and Friedman. The evolution of E a with a is compatible with the evaporation of stearic acid and the unzipping and thermo-oxidative decomposition mechanisms proposed for polystyrene. The apparent activation energies obtained for the experiments under argon revealed the increased concentration of weak links in polystyrene introduced during kneading of the feedstock. Extrapolation of the kinetic parameters obtained in one run to calculate decomposition rates under different heating rates confirmed the excellent predictive power of the direct methods.

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Section: Experiments In Argonsupporting

confidence: 86%

Kinetic analysis of the polymer burnout in ceramic thermoplastic processing of the YSZ thin electrolyte structures using model free method

Salehi¹,

Clemens²,

Graule³

et al. 2012

Applied Energy

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“…For the nonisothermal degradation of Folnak ® samples, we have an opposite case, which can be concluded that solid-solid interaction (23) probably exists. It can be pointed out that a noticeable upward shift of peak temperature by more than 60°C was observed (24)(25)(26).…”

Section: Resultsmentioning

confidence: 96%

Thermal Stability Investigation and the Kinetic Study of Folnak® Degradation Process Under Nonisothermal Conditions

Jankovi

2010

AAPS PharmSciTech

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Abstract. The nonisothermal degradation process of Folnak ® drug samples was investigated by simultaneous thermogravimetric and differential thermal analysis in the temperature range from an ambient one up to 810°C. It was established that the degradation proceeds through the five degradation stages (designated as I, II, III, IV, and V), which include: the dehydration (I), the melting process of excipients (II), as well as the decomposition of folic acid (III), corn starch (IV), and saccharose (V), respectively. It was established that the presented excipients show a different behavior from that of the pure materials. During degradation, all excipients increase their thermal stability, and some kind of solidsolid and/or solid-gas interaction occurs. The kinetic parameters and reaction mechanism for the folic acid decomposition were established using different calculation procedures. It was concluded that the folic acid decomposition mechanism cannot be explained by the simple reaction order (ROn) model (n= 1) but with the complex reaction mechanism which includes the higher reaction orders (RO, n>1), with average value of =1.91. The isothermal predictions of the third (III) degradation stage of Folnak ® sample, at four different temperatures (T iso =180°C, 200°C, 220°C, and 260°C), were established. It was concluded that the shapes of the isothermal conversion curves at lower temperatures (180-200°C) were similar, whereas became more complex with further temperature increase due to the pterin and p-amino benzoic acid decomposition behavior, which brings the additional complexity in the overall folic acid decomposition process.

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“…Furthermore, paraffins can thermally degrade. For alkanes in general, 350°C can be used as a guideline (Freund et al 1982), whereas paraffins decompose thermally at lower temperatures, about 210°C (Jaw et al 2001) in ambient atmosphere. Paraffins are compatible with metals and ceramics, but can cause softening of some polymers (Mehling and Cabeza 2008).…”

Section: Paraffin Propertiesmentioning

confidence: 99%

Review on miniaturized paraffin phase change actuators, valves, and pumps

Ogden

Klintberg

Thornell

et al. 2013

Microfluid Nanofluid

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During the last fifteen years, miniaturised paraffin actuation has evolved through the need of a simple actuation principle, still able to deliver large strokes and high actuation forces at small scales. This is achieved by the large and rather incompressible volume expansion associated with the solid-to-liquid phase transition of paraffin. The common approach has been to encapsulate the paraffin by a stiff surrounding that directs the volume expansion towards a flexible membrane, which deflects in a directed stroke. However, a number of alternative methods have also been used in the literature. The most common applications to this date have been switches, positioning actuators, and microfluidic valves and pumps. This review will treat the historical background, as well as the fundamentals in paraffin actuation, including material properties of paraffin. Besides reviewing the three major groups of paraffin actuator applications; actuators, valves, and pumps, the modelling done on paraffin actuation will be explored. Furthermore, a section focusing on fabrication of paraffin microactuators is also included. The review ends with conclusions and outlook of the field, identifying unexplored potential of paraffin actuation.The final publication is available at Springer via http://dx

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The thermal decomposition behaviors of stearic acid, paraffin wax and polyvinyl butyral

Cited by 56 publications

References 6 publications

Kinetic analysis of the polymer burnout in ceramic thermoplastic processing of the YSZ thin electrolyte structures using model free method

Kinetic analysis of the polymer burnout in ceramic thermoplastic processing of the YSZ thin electrolyte structures using model free method

Thermal Stability Investigation and the Kinetic Study of Folnak® Degradation Process Under Nonisothermal Conditions

Review on miniaturized paraffin phase change actuators, valves, and pumps

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