scholarly journals Isothermal and Non-Isothermal Crystallization Kinetics of PVDF and PVDF/PMMA Blends

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Jianbin SONG ◽  
Yuan CAI ◽  
Bin ZHANG ◽  
Lixin TANG ◽  
Rongrong SHI ◽  
...  
Keyword(s):  
Activation Energy ◽  
Crystallization Kinetics ◽  
Crystallization Rate ◽  
Crystallization Activation Energy ◽  
Nonisothermal Crystallization ◽  
Ozawa Equation ◽  
Nonisothermal Crystallization Kinetics ◽  
Kinetics Of ◽  
Pmma Blends ◽  
Pure Pvdf

Background: poly(vinylidene fluoride) PVDF and PVDF/PMMA blends have been investigated with a focus on the crystal structure, immiscibility and mechanical properties. However, few reports were found on the crystallization behaviors of PVDF and PVDF/PMMA blends, especially on crystallization kinetics. The article is to report the research on isothermal and nonisothermal crystallization kinetics for PVDF and PVDF/PMMA blends using differential scanning calorimetry (DSC). Results: Besides crystallization temperature and isothermal crystallization activation energy, the Avrami equation exponent of PVDF in blends decreased compared with pure PVDF. The nonisothermal crystallization kinetics of PVDF and PVDF/PMMA (70:30) blends were investigated by Ozawa equation, Jeziorny method and crystallization rate constant (CRC) in detail. The nonisothermal crystallization energy of pure PVDF and its blends were determined by the Kissinger and Vyazovkin’s method. Conclusion: The nucleation and growth mechanism of PVDF in blends changed compared with pure PVDF. The Ozawa equation is not applicable in nonisothermal crystallization kinetics of PVDF and PVDF/PMMA blends. The decreasing of crystallization ability of PVDF in blends were found and confirmed by CRC and the decline of crystallization rate constant in Jeziorny method. Such is opposite to the results of Kissinger’s and Vyazovkin’s method, chances are that these two methods were not used to calculate the nonisothermal crystallization activation energy where the nucleation process was influenced.

Effect of Hyperbranched Polymer on Crystallization Kinetics of Isotactic Polypropylene

2012 ◽  
Vol 535-537 ◽  
pp. 1142-1145
Author(s):  
Guang Tian Liu ◽  
Jing Lei
Keyword(s):  
Activation Energy ◽  
Crystallization Kinetics ◽  
Isotactic Polypropylene ◽  
Isothermal Crystallization ◽  
Hyperbranched Polymer ◽  
Crystallization Rate ◽  
Crystallization Activation Energy ◽  
Scanning Calorimetry ◽  
Isothermal Crystallization Kinetics ◽  
Kinetics Of

In this paper, the isothermal crystallization kinetics of isotactic polypropylene (iPP) and iPP with 5% hyperbranched polymer (HBP) added had been investigated by differential scanning calorimetry (DSC). The results show that a small addition of HBP affects the crystallization behavior of iPP. During isothermal crystallization, the crystallization rate of the blend is higher than those of iPP remarkably. An increase in the Avrami exponent may be attributed to the fractal structure of hyperbranched polymer. The crystallization activation energy is estimated by the Friedman equation, the results show that the activation energy decreases remarkably by addition of HBP and the crystallization rate of the blend is more sensitive to temperature than that of iPP.

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

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Zhimin Xing ◽  
Liusheng Zha ◽  
Guisheng Yang
Keyword(s):  
Crystallization Kinetics ◽  
Biomedical Applications ◽  
In Situ Polymerization ◽  
Mechanical Energy ◽  
Crystallization Rate ◽  
Thermomechanical Analysis ◽  
Mechanical Analysis ◽  
Nonisothermal Crystallization ◽  
Nonisothermal Crystallization Kinetics ◽  
Kinetics Of

AbstractPoly(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.

scholarly journals Approach to nonisothermal crystallization kinetics of poly( 4‐methyl‐1‐pentene ) melt: Effect of gamma‐ray

SPE Polymers ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 50-61
Author(s):  
Yuan‐Hsiang Chang ◽  
Yulin Zhang ◽  
Donyau Chiang ◽  
Fuqian Yang ◽  
Sanboh Lee
Keyword(s):  
Crystallization Kinetics ◽  
Gamma Ray ◽  
Nonisothermal Crystallization ◽  
Nonisothermal Crystallization Kinetics ◽  
Kinetics Of

Analysis of nonisothermal crystallization kinetics of graphene oxide - reinforced polyamide 6 nanocomposites

2018 ◽  
Vol 667 ◽  
pp. 111-121 ◽  
Author(s):  
Caio Cesar Nogueira de Melo ◽  
Cesar Augusto Gonçalves Beatrice ◽  
Luiz Antonio Pessan ◽  
Amanda Dantas de Oliveira ◽  
Fernando Machado Machado
Keyword(s):  
Graphene Oxide ◽  
Crystallization Kinetics ◽  
Polyamide 6 ◽  
Nonisothermal Crystallization ◽  
Nonisothermal Crystallization Kinetics ◽  
Kinetics Of
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