Isothermal crystallization kinetics and thermal behavior of poly(ɛ-caprolactone)/multi-walled carbon nanotube composites

Chen, Erh-Chiang; Wu, Tzong‐Ming

doi:10.1016/j.polymdegradstab.2007.02.019

Cited by 163 publications

(63 citation statements)

References 17 publications

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“…The increase of the crystallization temperature with the addition of MWCNTs reflects the nucleating effect of the latter, as has been reported in the literature for nanocomposites based on CNTs dispersed in semi-crystalline matrices. [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48] The noteworthy increase of the crystallization temperature observed in our case (T c passes from 27 to 38 8C with the addition of only 0.5% MWCNTs) is also seen by PVT measurements shown in Figure 3. For what we know, no PVT data have been reported so far in the literature for nanocomposites containing PCL or PCLPUR.…”

Section: Crystallization Behaviorsupporting

confidence: 67%

Thermal and Viscoelastic Features of New Nanocomposites Based on a Hot‐Melt Adhesive Polyurethane and Multi‐Walled Carbon Nanotubes

Fernández

Landa

Muñoz

et al. 2010

Macro Materials & Eng

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Novel nanocomposites prepared by melt mixing of MWCNTs in a hot‐melt adhesive PCL‐based polyurethane are investigated. The nucleating effect of MWCNTs and the confinement they cause to polymer chains are considered. The broadening of the glass transition is indicative of a growth of the immobilized amorphous fraction adhered to MWCNTs. In the molten state the formation of a combined polymer/MWCNT network is observed. Practical requisites of hot melt adhesives, such as adequate melting temperature, crystallization degree, and viscosity are preserved when MWCNTs are added. Improvement of strength at room temperature and welding rate during cooling, are observed.

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Section: Crystallization Behaviorsupporting

confidence: 67%

Thermal and Viscoelastic Features of New Nanocomposites Based on a Hot‐Melt Adhesive Polyurethane and Multi‐Walled Carbon Nanotubes

Fernández

Landa

Muñoz

et al. 2010

Macro Materials & Eng

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“…Results show that PCL contains three strong reflections at the angles (2!) of about 21.4, 22.0 and 23.7°, corresponding to the (110), (111) and (200) planes of the orthorhombic crystal structure respectively [25]. XRD pattern of pure CS whisker indicates that the CS whisker in this experiment is CaSO 4 #2H 2 O [26].…”

Section: Results and Discussion 31 Morphology Of Fracture Surfacesmentioning

confidence: 66%

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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“…Also, as the activation energy for crystallization is very temperature dependent, extrapolation above the measured boundaries was not possible. Chen and Wu 61 reported a somewhat higher activation energy value of À333.8 kJ/mol for PCL with an M n of 42,000; this may have been due to the difference in M n .…”

Section: Activation Energy For Crystallizationmentioning

confidence: 94%

Isothermal and nonisothermal crystallization kinetics of poly(ϵ‐caprolactone)

Dhanvijay

Shertukde

Kalkar

2011

J of Applied Polymer Sci

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With increasing environmental awareness, evaluating the potential of biopolymers as a substitute for traditional materials has been of great interest. Crystallization kinetics provides fundamental knowledge required for evaluation, playing vital role in determining the final properties of the product. In this study, the isothermal and nonisothermal crystallization kinetics of poly(e-caprolactone) (PCL) were investigated with the help of various models. The Avrami model best described the isothermal crystallization kinetics, suggesting three-dimensional spherulitic growth, which was in agreement with the morphology studies; whereas the Liu model fit well under nonisothermal crystallization conditions. The failure of the Kissinger model to determine the activation energy was overcome with the Friedman model. The kinetic crystallizability determined by the Ziabacki model indicated a higher crystallization ability of PCL at lower cooling rates.

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Isothermal crystallization kinetics and thermal behavior of poly(ɛ-caprolactone)/multi-walled carbon nanotube composites

Cited by 163 publications

References 17 publications

Thermal and Viscoelastic Features of New Nanocomposites Based on a Hot‐Melt Adhesive Polyurethane and Multi‐Walled Carbon Nanotubes

Thermal and Viscoelastic Features of New Nanocomposites Based on a Hot‐Melt Adhesive Polyurethane and Multi‐Walled Carbon Nanotubes

Fabrication and characterization of polycaprolactone/calcium sulfate whisker composites

Isothermal and nonisothermal crystallization kinetics of poly(ϵ‐caprolactone)

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