Nonisothermal Crystallization Kinetics of Poly(m-xylylene adipamide)

2014 ◽  
Vol 971-973 ◽  
pp. 103-106
Author(s):  
Xiao Hua Gu ◽  
Peng Zeng ◽  
Xi Wei Zhang ◽  
Xue Song
Keyword(s):  
Differential Scanning Calorimetry ◽  
Crystallization Kinetics ◽  
Three Dimensional ◽  
Avrami Exponent ◽  
Scanning Calorimetry ◽  
Nonisothermal Crystallization ◽  
Thermal Nucleation ◽  
Nonisothermal Crystallization Kinetics ◽  
Kinetics Of ◽  
Dimensional Crystal

Abstract.In this paper, the nonisothermal crystallization kinetics was investigated by differential scanning calorimetry for the poly(m-xylylene adipamide) (MXD6) which were prepared by polymerization in reactor. The Avrami theory modified by Jeziorny and Z.S. Mo equation were used to describe the nonisothermal crystallization kinetics. The analysis based on the Avrami theory modified by Jeziorny shows that the Avrami exponent n of MXD6 ranges from 2.3 to 3.3, Moreover, both Avrami exponent (n) were around 3.0, which probably suggests a thermal nucleation and a three-dimensional crystal growth. The good linearity of the plots indicates the successful application of Z.S. Mo method in this case.

Nonisothermal Crystallization Kinetics of Poly(ethylene terephthalate) Nanocomposites

2008 ◽  
Vol 8 (4) ◽  
pp. 1812-1822 ◽  
Author(s):  
Jayita Bandyopadhyay ◽  
Suprakas Sinha Ray ◽  
Mosto Bousmina
Keyword(s):  
Crystallization Kinetics ◽  
Isothermal Crystallization ◽  
Ethylene Terephthalate ◽  
Ozawa Method ◽  
Scanning Calorimetry ◽  
Nonisothermal Crystallization ◽  
Poly Ethylene Terephthalate ◽  
Nonisothermal Crystallization Kinetics ◽  
Poly Ethylene ◽  
Kinetics Of

This article reports the nonisothermal crystallization kinetics of poly(ethylene terephthalate) (PET) nanocomposites. The non-isothermal crystallization behaviors of PET and the nanocomposite samples are studied by differential scanning calorimetry (DSC). Various models, namely the Avrami method, the Ozawa method, and the combined Avrami-Ozawa method, are applied to describe the kinetics of the non-isothermal crystallization. The combined Avrami and Ozawa models proposed by Liu and Mo also fit with the experimental data. Different kinetic parameters determined from these models prove that in nanocomposite samples intercalated silicate particles are efficient to start crystallization earlier by nucleation, however, the crystal growth decrease in nanocomposites due to the intercalation of polymer chains in the silicate galleries. Polarized optical microscopy (POM) observations also support the DSCresults. The activation energies for crystallization has been estimated on the basis of three models such as Augis–Bennett, Kissinger and Takhor methods follow the trend PET/2C20A<PET/1.3C20A<PET, indicating incorporation of organoclay enhance the crystallization by offering large surface area.

Orthogonal Smectic Layers Favour Nucleation through Diffusioncontrolled Transformations: A Systematic Crystallization Kinetics Study

2002 ◽  
Vol 57 (5) ◽  
pp. 226-232 ◽  
Author(s):  
P. A. Kumar ◽  
Pisupati Swathi ◽  
V. G. K. M. Pisipati
Keyword(s):  
Differential Scanning Calorimetry ◽  
Crystal Growth ◽  
Crystallization Kinetics ◽  
Crystallization Process ◽  
Avrami Exponent ◽  
Kinetics Study ◽  
Nucleation Process ◽  
Temperature Dependent ◽  
Scanning Calorimetry ◽  
Kinetics Of

Systematic investigations of the crystallization kinetics of two representative compounds of p-phenylbenzylidene-p´ -alkylanilines are performed, using differential scanning calorimetry, to study the influence of the kinetophase (occurs prior to the crystal phase) on the nucleation process. The dimensionality of the crystal growth and the related crystallization process are discussed in terms of the Avrami parameters n and b. The trend in the magnitude of the Avrami exponent n supports the occurrence of temperature-dependent transformations in the orthorhombic molecular array.

Miscibility and crystallization kinetics of poly(ε- caprolactone)/bezoxazine blends

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Hsiu-Jung Chiu ◽  
Ruey-Shi Tsai ◽  
Jieh-Ming Huang
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Crystallization Kinetics ◽  
Equilibrium Temperature ◽  
Cooling Process ◽  
Scanning Calorimetry ◽  
Nonisothermal Crystallization ◽  
Polarized Optical Microscopy ◽  
Equation Analysis ◽  
Kinetics Of

Abstract The miscibility and crystallization kinetics of the blends of poly(e- caprolactone) (PCL) and bezoxazine (B-m) resin was investigated by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). It was found that PCL/B-m blends were miscible in the melt. Thus the blend exhibited a single glass transition temperature (Tg), which increased with increasing B-m composition and the crystal equilibrium temperature (Tmo) depressed with the addition of B-m from the Hoffman-Weeks equation analysis. The freezing crystallization temperature (Tfc) for the nonisothermal crystallization on the cooling process, and the spherulitic growth and overall crystallization rates of PCL for the isothermal crystallization were depressed with the addition of B-m component, attributing it to the dilution of PCL concentration due to the addition of B-m.

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

scholarly journals Thermal Properties and Non-Isothermal Crystallization Kinetics of Poly (δ-Valerolactone) and Poly (δ-Valerolactone)/Titanium Dioxide Nanocomposites

Crystals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 452 ◽  
Author(s):  
Waseem Saeed ◽  
Abdel-Basit Al-Odayni ◽  
Abdulaziz Alghamdi ◽  
Ali Alrahlah ◽  
Taieb Aouak
Keyword(s):  
Titanium Dioxide ◽  
Crystallization Kinetics ◽  
Isothermal Crystallization ◽  
Three Dimensional ◽  
Degree Of Crystallinity ◽  
Simultaneous Occurrence ◽  
Scanning Calorimetry ◽  
Isothermal Crystallization Kinetics ◽  
The Stability ◽  
Kinetics Of

New poly (δ-valerolactone)/titanium dioxide (PDVL/TiO2) nanocomposites with different TiO2 nanoparticle loadings were prepared by the solvent-casting method and characterized by Fourier transform infra-red, differential scanning calorimetry, X-ray diffraction and scanning electron microscopy, and thermogravimetry analyses. The results obtained reveal good dispersion of TiO2 nanoparticles in the polymer matrix and non-formation of new crystalline structures indicating the stability of the crystallinity of TiO2 in the composite. A significant increase in the degree of crystallinity was observed with increasing TiO2 content. The non-isothermal crystallization kinetics of the PDVL/TiO2 system indicate that the crystallization process involves the simultaneous occurrence of two- and three-dimensional spherulitic growths. The thermal degradation analysis of this nanocomposite reveals a significant improvement in the thermal stability with increasing TiO2 loading.

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