Kinetics of non-isothermal crystallization

Ozawa, Taku

doi:10.1016/0032-3861(71)90041-3

Cited by 2,182 publications

(1,285 citation statements)

References 17 publications

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“…To determine the activation energy, the approach used in this study was based on the theoretical model formulated by Kissinger (1957) [50][51][52]. Using the Kissinger model, the relationship between a particular heating rate, β i (e.g., 5, 10, 15, or 20 K/min), and the peak exothermic (crystallization) temperature, T p (K), could be expressed as the following,…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

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Microstructural evolution and physical behavior of a lithium disilicate glass–ceramic

et al. 2015

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Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

“…For this thesis, the most popular approximation developed by Kissinger (1957) was used to model the kinetics of lithium metasilicates and lithium disilicates [50][51][52]. The lines in Figures 18A and B, attained from the statistical linear regression, were the best fits between…”

Section: Effective Activation Energymentioning

confidence: 99%

Microstructural evolution and physical behavior of a lithium disilicate glass–ceramic

et al. 2015

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“…등온 결정화 이론으로서는 Avrami 등온 결정화 이론을 15 변 형시킨 Ziabicki 이론, 16 Ozawa 이론, 17 Liu 이론, 18 Figure 1과 같은 적분구 액세서 리를 사용하여 380-780 nm 파장영역에서 네 가지 패턴을 측 정하고 식 (1)로부터 haze를 계산하였다.…”

Section: 서 론unclassified

Non-isothermal Crystallization Behaviors of Ethylene-Tetrafluoroethylene Copolymer

Lee¹,

Hyokap²,

Kan³

2012

Polymer Korea

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The non-isothermal crystallization behavior of ethylene-tetrafluoroethylene (ETFE) copolymer was investigated by DSC and imaging FTIR analysis. Modified non-isothermal Avrami analysis was applied to interpret the crystallization behavior of ETFE. It was found that the less linearity in ln[-ln(1-X(t))] vs. ln(t) plot was obtained in thermal analysis comparison with imaging FTIR due to relatively small crystallization enthalpy change in ETFE. It means that imaging FTIR measured by overall IR absorption intensity change due to the crystallization was found to be effective to understand the non-isothermal crystallization kinetics of ETFE. In addition, the optical transmittance of ETFE was studied. The crystallite developed by slow cooling caused the light scattering and resulted in the increase of haze and the lowering of transmittance up to 8%. From our results, it was confirmed that cooling rate is an important processing parameter for maintaining optical transmittance of ETFE as a replacement material for glass.Keywords: ethylene-tetrafluoroethylene copolymer, non-isothermal crystallization, imaging FTIR, transmittance. 서 론 Ethylene-tetrafluoroethylene(ETFE)공중합체는

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“…Several theoretical methods have been employed to predict and analyze kinetics of nonisothermal crystallization, and one of the most commonly used was proposed by Ozawa. Considering the effect of the cooling rate R on the crystallization kinetics, Ozawa [32] extended the Avrami equation to nonisothermal crystallization, as follows:…”

Section: Ozawa Analysis In Nonisothermal Crystallization Kineticsmentioning

confidence: 99%

Thermomechanical behavior and nonisothermal crystallization kinetics of poly(ε-caprolactone) and poly(ε- caprolactone)/poly(N-vinylpyrrolidone) blends

2010

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Poly(ε-caprolactone) (PCL) and PCL/Poly(N-vinylpyrrolidone) (PVP) blends are shown to have the potential to be used in a range of biomedical applications and can be processed with successive in-situ polymerization procedures. In this paper, the thermomechanical analysis of PCL and PCL/PVP blends was performed using dynamic mechanical analysis (DMA). The storage and loss moduli as a function of temperature and frequency were recorded. The nonisothermal crystallization kinetics of PCL and PCL/PVP blends were analyzed using Ozawa model and Mo-Liu equation, a combination equation of Avrami and Ozawa formulas. The Ozawa analysis failed to describe the nonisothermal crystallization behavior of blends, whereas the Mo-Liu equation successfully described the nonisothermal crystallization kinetics of PCL and PCL/PVP blends. In addition, the value of crystallization rate coefficient under nonisothermal crystallization conditions was calculated. The PCL/PVP blends compared with the pure PCL and PVP had a restrain effect on the crystallization kinetics of PCL in the blends. Combining the results of DMA and DSC, PVP effectively decreased the crystallinity of PCL and enhanced its damping properties, which indicated that PCL/PVP blends could be more suitable than PCL in some biomedical applications, as it might help in the dissipation of the mechanical energy generated by the patient movements.

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Kinetics of non-isothermal crystallization

Cited by 2,182 publications

References 17 publications

Microstructural evolution and physical behavior of a lithium disilicate glass–ceramic

Microstructural evolution and physical behavior of a lithium disilicate glass–ceramic

Non-isothermal Crystallization Behaviors of Ethylene-Tetrafluoroethylene Copolymer

Thermomechanical behavior and nonisothermal crystallization kinetics of poly(ε-caprolactone) and poly(ε- caprolactone)/poly(N-vinylpyrrolidone) blends

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