Avrami analysis of melt crystallization behavior of Trogamid

Lactide-Caprolactone copolymer (LACL) was added to a Polylactide/Poly(ε-caprolactone) (PLA/PCL) blend as a compatibilizer through solution mixing and the casting method. The melt crystallization behavior and crystalline morphology of PLA, PLA/PCL, and PLA/PCL/LACL were investigated using differential scanning calorimeter (DSC) and polarized optical microscopy (POM), respectively. The temperature of the shortest crystallization time for the samples was observed at 105 °C. The overall isothermal melt crystallization kinetics of the three samples were further studied using the Avrami theory. Neat PLA showed a higher half-time of crystallization than that of the PLA/PCL and PLA/PCL/LACL blends, whereas the half-time of crystallization of PLA/PCL and PLA/PCL/LACL showed no significant difference. The addition of PCL decreased the spherulite size of crystallized PLA, and the nuclei density in the PLA/PCL/LACL blend was much higher than that of the PLA and PLA/PCL samples, indicating that LACL had a compatibilization effect on the immiscible PLA/PCL blend, thereby promoting the nucleation of PLA. The spherulites in the PLA/PCL and PLA/PCL/LACL blend exhibited a smeared and rough morphology, which can be attributed to the fact that PCL molecules migrated to the PLA spherulitic surface during the crystallization of PLA.

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Effect of Cellulose Nanocrystal on Crystallization Behavior of Poly(3–hydroxybutyrate–co–3–hydroxyvalerate)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.430-432.20 ◽

2012 ◽

Vol 430-432 ◽

pp. 20-23 ◽

Cited By ~ 4

Author(s):

Hou Yong Yu ◽

Zong Yi Qin

Keyword(s):

Heterogeneous Nucleation ◽

Crystallization Temperature ◽

Crystallization Behavior ◽

Crystallization Rate ◽

Kinetics Study ◽

Solvent Casting ◽

Melt Crystallization ◽

Casting Method ◽

Isothermal Crystallization Kinetics ◽

Biodegradable Nanocomposites

The biodegradable nanocomposites of poly (3–hydroxybutyrate–co–3–hydroxyvalerate) (PHBV) with different cellulose nanocrystals (CNCs) contents were prepared by a solvent casting method. The effects of CNCs on the crystallization behavior of PHBV were studied by DSC. The DSC results showed that compared to PHBV, the melt crystallization temperature increased to 92.3 °C for the nanocomposites with 10 wt. % CNCs, which indicated that the crystallization of PHBV became easier with the addition of CNCs. Moreover, the non–isothermal crystallization kinetics study illustrated that overall crystallization rate of PHBV in the nanocomposites was faster than that of neat PHBV, which should be attributed to the strong heterogeneous nucleation of CNCs.

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Evaluation of thermal degradation and melt crystallization behavior of taro mucilage and its graft copolymer with poly(lactide)

SN Applied Sciences ◽

10.1007/s42452-019-1490-4 ◽

2019 ◽

Vol 1 (11) ◽

Cited By ~ 1

Author(s):

Abubakar Hamisu Mijinyawa ◽

Geeta Durga ◽

Anuradha Mishra

Keyword(s):

Thermal Degradation ◽

Graft Copolymer ◽

Crystallization Behavior ◽

Melt Crystallization

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Thermal Properties and Crystallization Behavior of Co67Fe4Cr7Si8B14 Amorphous Alloy

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.297-301.330 ◽

2010 ◽

Vol 297-301 ◽

pp. 330-337

Author(s):

M. Haddad-Sabzevar ◽

S. Sahebian ◽

Z. Jamili ◽

S.A. Hasheminejad

Keyword(s):

Thermal Properties ◽

Melt Spinning ◽

Crystallization Behavior ◽

Heating Rates ◽

Transformation Mechanism ◽

Avrami Model ◽

Avrami Analysis ◽

Thermal Analyzer ◽

Spinning Process ◽

Higher Temperature

In order to investigate the crystallization behavior of the Co67Fe4Cr7Si8B14 amorphous metallic alloy, ribbons of this alloy were prepared by planar flow melt spinning process (PFMS). Differential scanning calorimetery (DSC) and differential thermal analyzer (DTA) were used to analyze the thermal properties and crystallization behavior of the samples at three heating rates of 10, 20 and 30º C/min. The experimental data were fitted to the Avrami model to determine the crystallization behavior. The results showed that the crystallization exotherm became wider and shifted toward a higher temperature range as the heating rate increased. The Avrami analysis also showed that n is about 1, which is related to the same transformation mechanism at different heating rates. The Kissinger method was used to determine the activation energy for the first crystallization peaks. The measured value is approximately 332.67 kJ/g.

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