Degradation of polyethylene by a nonisothermal method using thermogravimetry

1982 ◽  
Vol 20 (10) ◽  
pp. 539-542 ◽  
Author(s):  
F. Zamora
Keyword(s):  
Nonisothermal Method

Crystal growth rates and master curves of poly(ethylene succinate) and its copolyesters using a nonisothermal method

2010 ◽  
Vol 48 (9) ◽  
pp. 932-939 ◽  
Author(s):  
Chia-Jung Tsai ◽  
Ming Chen ◽  
Hsin-Ying Lu ◽  
Wei-Che Chang ◽  
Chi He Chen
Keyword(s):  
Crystal Growth ◽  
Growth Rates ◽  
Master Curves ◽  
Poly Ethylene ◽  
Nonisothermal Method

scholarly journals Kinetic Analysis of the Thermal Decomposition of Latex Foam according to Thermogravimetric Analysis

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Hongwei Fan ◽  
Yongliang Chen ◽  
Dongmei Huang ◽  
Guoqin Wang
Keyword(s):  
Thermal Decomposition ◽  
Thermogravimetric Analysis ◽  
Preexponential Factor ◽  
Kinetic Mechanism ◽  
Heating Rates ◽  
Third Order ◽  
Before And After ◽  
Ft Ir ◽  
The Mean ◽  
Nonisothermal Method

The thermal decomposition of latex foam was investigated under nonisothermal conditions. Pieces of commercial mattress samples were subjected to thermogravimetric analysis (TG) over a heating range from 5°C min−1 to 20°C min−1. The morphology of the latex foam before and after combustion was observed by scanning electron microscopy (SEM), and the primary chemical composition was investigated via infrared spectroscopy (FT-IR). The kinetic mechanism and relevant parameters were calculated. Results indicate that the decomposition of latex foam in the three major degradation phases is controlled by third-order reaction (F3) and by Zhuravlev’s diffusion equation (D5). The mean E values of each phase as calculated according to a single heating rate nonisothermal method are equal to 41.91 ± 0.06 kJ mol−1, 86.32 ± 1.04 kJ mol−1, and 19.53 ± 0.11 kJ mol−1, respectively. Correspondingly, the preexponential factors of each phase are equal to 300.39 s−1, 2355.65 s−1, and 27.90 s−1, respectively. The mean activation energy E and preexponential factor A of latex foam estimated according to multiple heating rates and a nonisothermal method are 92.82 kJ mol−1 and 1.12 × 10−3 s−1, respectively.

scholarly journals Step Nonisothermal Method in Kinetics Studies of Captopril Oxidation under Compressed Oxygen

2008 ◽  
Vol 128 (4) ◽  
pp. 617-624 ◽  
Author(s):  
Bing LIN ◽  
Xian-Cheng ZHAN ◽  
Lin-Li LI ◽  
Cheng-Rong LI ◽  
Hai-Jun QI ◽  
...  
Keyword(s):  
Kinetics Studies ◽  
Nonisothermal Method

Step Nonisothermal Method to Study Stability of Drugs

2009 ◽  
Vol 35 (2) ◽  
pp. 154-164 ◽  
Author(s):  
Bing Lin ◽  
Xian-Cheng Zhan ◽  
Jian-Lin Tao ◽  
Lin-Li Li ◽  
Hai-Jun Qi
Keyword(s):  
Nonisothermal Method

A novel process of electroless Ni–P plating by nonisothermal method

2005 ◽  
Vol 89 (2-3) ◽  
pp. 383-389 ◽  
Author(s):  
Ming-Der Ger ◽  
Yuh Sung ◽  
Jinn-Luh Ou
Keyword(s):  
Electroless Ni ◽  
Nonisothermal Method

Isothermal and Nonisothermal Creep of Lightly Crosslinked cis-1,4-Polybutadiene

1977 ◽  
Vol 50 (5) ◽  
pp. 884-894
Author(s):  
J. M. Caruthers ◽  
R. E. Cohen
Keyword(s):  
Activation Energy ◽  
Large Deformations ◽  
Creep Data ◽  
Creep Experiment ◽  
Viscoelastic Creep ◽  
Temperature Superposition ◽  
Linear Viscoelastic ◽  
Nonisothermal Method ◽  
Nonisothermal Creep ◽  
Good Agreement

Abstract A nonisothermal creep experiment has been analyzed to ascertain its suitability for determining the temperature dependence of low-activation-energy viscoelastic processes in elastomers far above Tg. The nonisothermal method was employed to determine the activation energy for creep near 35°C in a lightly crosslinkedcis-1,4-polybutadiene elastomer at small strains within the linear viscoelastic region and at various large deformations up to rupture. The observed activation energy was essentially independent of the level of strain, and the value of ΔHa (∼ 11 kcal/mol) determined via the nonisothermal creep method was in good agreement with the result (∼12 kcal/mol) obtained via time-temperature superposition of isothermal linear viscoelastic creep data. The nonisothermal data allowed for an estimate of the volume of the “flow unit” associated with the controlling viscoelastic creep mechanism, attributed here to slippage of entanglements within lightly crosslinked network.

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