Polymer Crystallization: A DSC Approach to Building the T‐CR‐T Diagram

Berlanga, Rosa; Suñol, J.J.; Saurina, J.

doi:10.1002/mats.200700063

Cited by 3 publications

(5 citation statements)

References 29 publications

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“…Table 2 shows the thermal and crystallization properties parameters of pure PCL and PCL/CS whisker composites determined by DSC measurement. The undercooling $T in Table 2 is defined using Equation (1) [27]:…”

Section: Results and Discussion 31 Morphology Of Fracture Surfacesmentioning

confidence: 99%

“…The difference in impact strength between the composites prepared by two methods should be ascribed to several factors such as spherulite size, whisker debonding during impact test and whisker length. It is reported that the decrease of spherulite size will benefit the improvement of impact strength [27]. POM observation shows that the composites prepared by coprecipitation have smaller spherulite size.…”

Section: Mechanical Propertiesmentioning

confidence: 95%

See 1 more Smart Citation

Fabrication and characterization of polycaprolactone/calcium sulfate whisker composites

Liu¹,

Reni²,

Wei³

et al. 2011

Express Polym. Lett.

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Abstract. Polycaprolactone (PCL)/calcium sulfate (CS) whisker composites have been fabricated by melt blending and coprecipitation methods respectively. Scanning electron microscope (SEM) was used to observe the microstructure of the composites. The crystallization and thermal properties were characterized by polarized optical microscope (POM), X-ray diffractometry (XRD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). For composites prepared by melt blending method, experiment results show that average length of the whiskers is shortened. The crystallization perfection of PCL in composites is improved by adding whiskers. The flexural strength increases whereas the impact strength decreases. For composites prepared by coprecipitation method, whisker addition worsens the crystallization perfection of PCL. An improvement of 21% in flexural strength and 22% in impact strength has been achieved for the composite with 15 wt% of whiskers.

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Section: Results and Discussion 31 Morphology Of Fracture Surfacesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 95%

Fabrication and characterization of polycaprolactone/calcium sulfate whisker composites

Liu¹,

Reni²,

Wei³

et al. 2011

Express Polym. Lett.

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“…The undercooling shown in Table 1 is defined as the difference between melting and crystallization temperatures [21]: where T m and T c are the melting and crystallization temperatures determined from Figs. 3–6, respectively.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and properties of polycaprolactone/calcium sulfate particle and whisker composites

Liu

Wei

et al. 2012

Polymer Composites

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Polycaprolactone (PCL)/calcium sulfate (CS) particle and whisker composites were prepared by coprecipitation method and studied by evaluating their microstructure, crystallization, and mechanical properties. Results show that both of the CS whisker and particle dispersed in PCL can reduce the spherulite size of PCL and improve the regularity of the spherulite. The nucleation effect of the CS whisker is stronger than that of the CS particle. Mechanical properties of PCL were obviously improved by both of the particle and whisker addition. The flexural modulus and impact strength of the whisker composites are higher than that of the particle composites, which could be explained by the interfacial debonding mechanism. On the basis of the crystallization and mechanical studies, it is found that the size of spherulites and the concentration of CS particles and whiskers have played an important role in the improvement in mechanical properties of the composite. POLYM. COMPOS., 33:501-508, 2012. ª

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“…Indeed, experimental values of B α appear to show reasonable constancy [36,96]. Most importantly, both techniques allow one to simulate the time-cooling rate-transformation and TTT diagrams [36,[94][95][96]. Similar evaluations can be carried out by using the method of Dobreva et al [97,98].…”

Section: Turnbull-fisher Treatment For Broad Temperature Rangementioning

confidence: 95%

“…An advantage of such a method is that one can also test the constancy of B α , which is expected based on Equation (23). Indeed, experimental values of B α appear to show reasonable constancy [36,96]. Most importantly, both techniques allow one to simulate the time-cooling rate-transformation and TTT diagrams [36,[94][95][96].…”

Section: Turnbull-fisher Treatment For Broad Temperature Rangementioning

confidence: 99%

Nonisothermal Crystallization Kinetics by DSC: Practical Overview

Vyazovkin

Sbirrazzuoli

2023

Processes

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Providing a minimum of theory, this review focuses on practical aspects of analyzing the kinetics of nonisothermal crystallization as measured with differential scanning calorimetry (DSC). It is noted that kinetic analysis is dominated by approaches based on the Avrami and Arrhenius equations. Crystallization kinetics should not be considered synonymous with the Avrami model, whose nonisothermal applications are subject to very restrictive assumptions. The Arrhenius equation can serve only as a narrow temperature range approximation of the actual bell-shaped temperature dependence of the crystallization rate. Tests of the applicability of both equations are discussed. Most traditional kinetic methods tend to offer very unsophisticated treatments, limited only to either glass or melt crystallization. Differential or flexible integral isoconversional methods are applicable to both glass and melt crystallization because they can accurately approximate the temperature dependence of the crystallization rate with a series of the Arrhenius equations, each of which corresponds to its own narrow temperature interval. The resulting temperature dependence of the isoconversional activation energy can be parameterized in terms of the Turnbull–Fisher or Hoffman–Lauritzen theories, and the parameters obtained can be meaningfully interpreted and used for kinetic simulations.

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Polymer Crystallization: A DSC Approach to Building the T‐CR‐T Diagram

Cited by 3 publications

References 29 publications

Fabrication and characterization of polycaprolactone/calcium sulfate whisker composites

Fabrication and characterization of polycaprolactone/calcium sulfate whisker composites

Microstructure and properties of polycaprolactone/calcium sulfate particle and whisker composites

Nonisothermal Crystallization Kinetics by DSC: Practical Overview

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