Non-isothermal crystallization kinetics of polypropylene/short glass fibre/multiwalled carbon nanotube composites

Rasana, Nanoth; Jayanarayanan, Karingamanna; Pegoretti, Alessandro

doi:10.1039/c8ra07243d

Cited by 32 publications

(18 citation statements)

References 36 publications

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“…Hence, it comprises contributions from both, indicating an immiscible dispersive additive pattern. No β (300) and β (301) peaks at 2θ = 16.1° and 21.8°, respectively, and no γ (117) peak at 2θ = 20.05° are noted . Therefore, the GnP disperses into the α‐monoclinic phase of i ‐PP without effecting the polymorphism.…”

Section: Resultsmentioning

confidence: 97%

“…Hence, the assumption of variable crystallization mechanisms, reported in select literature, does not appear to be valid. It is worth noting that recent studies report that the Ozawa model could not successfully evaluate the non‐isothermal crystallization kinetics of i ‐PP‐MWCNT composites …”

Section: Resultsmentioning

confidence: 99%

“…Table lists the crystal sizes corresponding to the α(110), α(040), α(130), and α(111) diffraction planes. Each diffraction plane crystal size L(hkl) was calculated using the following Scherrer relation:

L ((), hkl) = \frac{0.89 \times λ_{CuKα}}{italicβCos ((), θ)},

where β is the full‐width at half maximum ( FWHM ) in radian, λ CuKα = 15.406 nm, and θ is the Bragg angle in degree. FWHM was obtained (in degree) by deconvoluting a given diffractogram using Lorentz function and Origin software.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, research on this topic is constantly being conducted. The current nanofillers include graphite, single and multi‐walled carbon nanotubes (SWCNTs and MWCNTs), and graphene oxide (GnO) . Amino‐functionalized MWCNTs, in particular, have improved the fracture toughness and strain energy as well as flexural strength and stiffness of the base polymer …”

Section: Introductionmentioning

confidence: 99%

“…The related published work on crystallization deals with i ‐PP‐CNT, i ‐PP‐montmorillonite and i ‐PP‐calcium carbonate, i ‐PP‐exfoliated graphite, and i ‐PP‐GnP nanocomposites . We focus, as summarized above, on nucleating an agent‐free i ‐PP‐GnP nanocomposite.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Non‐isothermal crystallization of Ziegler Natta i‐PP‐graphene nanocomposite: DSC and new model prediction

et al. 2020

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Crystallization occurs in processing i-PP-GnP nanocomposites, and these nanocomposites have the potential to replace traditional fillers and be used to fabricate advanced materials and technology. Therefore, this subject was comprehensively investigated by applying a recent crystallization model, non-isothermal DSC experiments, Raman spectroscopy, and WAXRD. The multi-layer GnPinduced nucleation and the crystal growth rates were modelled. The overall modelling effort generated new insights, results, and explanations. This study confirmed and elucidated, or refuted several published conclusions. It has also been reported that the present model can pursue differences in catalyst-mediated i-PP backbone defects (stereo and regio) by simulating the relative crystallization profile and determining the crystallization kinetic triplet (n, k o , and E a ). The multiple roles played by GnP were underscored, which exceed what the related literature currently reports. The Raman and XRD work revealed the interaction between GnP and i-PP. The shear-induced dispersion of GnP that occurs during extrusion significantly affected i-PP crystal size distribution. The present approach can also assess the effects of catalyst type and structure, and backbone defect types and their distribution on the non-isothermal crystallization of, in general, polyolefin blends and nanocomposites.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

L ((), hkl) = \frac{0.89 \times λ_{CuKα}}{italicβCos ((), θ)},

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Non‐isothermal crystallization of Ziegler Natta i‐PP‐graphene nanocomposite: DSC and new model prediction

et al. 2020

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On the crystal growth kinetics of ultra‐toughened biobased polyamide 410: New insights on dynamic crystallization

Samantaray

Satapathy

2021

J of Applied Polymer Sci

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The influence of elastomeric poly (octene-co-ethylene) on the crystallization of polyamide 410 in PA-410/POE-g-MA blends was systematically analyzed using a non-isothermal crystallization kinetics approach. A novel power-law criterion was employed to characterize the crystallization regimes (primary and secondary) as a function of cooling rate to understand the nature of crystal arrangement vis-a-vis various kinetic models proposed by Avrami, Jeziorny (modified Avrami method), Ozawa and Liu-Mo. The activation energy pattern with fractional crystallinity from onset to fully developed crystals is discussed as per Friedman's theory. The POE phase acted as a weak nucleating agent for PA 410. The effect of elastomer on crystallization rate constant remained almost unchanged regardless of the blend composition. This insensitivity is attributed to (1) nucleating effect of POE-g-MA (because of resemblance in the molecular scheme) and (2) hindrance effect through the formation of an interfacial network; these two effects nearly offset one another. Our study illustrates the crucial dependence of acceleration of cooling that is, acceleration required for attaining a certain fraction of crystallinity with composition (threshold elastomer concentration), on an interfacial network in binary blends.

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The thermal conductivity of 3D network reinforced polypropylene matrix composites was constructed by the pickering‐like emulsion method

Zheng,

Bai,

Wang

et al. 2024

J of Applied Polymer Sci

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Polypropylene (PP) has the advantages of corrosion resistance, easy processing, and low dielectric loss, but its low thermal conductivity limits the application of its composites in fields such as electronic packaging. To solve this problem, in this work, composite microspheres with the segregated structure were prepared by coating boron nitride nanosheets (BNNSs) on the PP surface by Pickering‐like emulsion method, and BNNSs@PP composites with three‐dimensional thermal conductivity network were obtained after molding. Due to the high thermal conductivity of BNNSs and the formation of perfect thermal conduction pathways, the thermal conductivity of the composites reached 1.71 W m−1 K−1 when the content of BNNSs was 10.1 wt%, which was a 713% increase in thermal conductivity for that of pure PP. At the same time, the mechanical properties of the composites were ensured. This method provides a simple and effective technique to improve the thermal conductivity of PP‐based thermally conductive composites, which has a wide application potential in electronic packaging.

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Non-isothermal crystallization kinetics of polypropylene/short glass fibre/multiwalled carbon nanotube composites

Abstract: Application of Avrami, Mo, Ozawa models for non-isothermal crystallization kinetics of multiscale filler reinforced PP composites.

Cited by 32 publications

References 36 publications

Non‐isothermal crystallization of Ziegler Natta i‐PP‐graphene nanocomposite: DSC and new model prediction

Non‐isothermal crystallization of Ziegler Natta i‐PP‐graphene nanocomposite: DSC and new model prediction

On the crystal growth kinetics of ultra‐toughened biobased polyamide 410: New insights on dynamic crystallization

The thermal conductivity of 3D network reinforced polypropylene matrix composites was constructed by the pickering‐like emulsion method

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