On the Effect of Particle Size, Shape, Concentration, and Aggregation on the Flow-Induced Crystallization of Polymers

D’Haese, Michelle; Langouche, F.; Puyvelde, Peter Van

doi:10.1021/ma400318a

Cited by 42 publications

(37 citation statements)

References 67 publications

(115 reference statements)

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“…According to the literature, the existence of the particles will hinder the chain alignment under flow. For poly(lactic acid) and iPP, inorganic nucleating agents have no effect on the strain‐induced crystallization when the strain rate is sufficiently high . If the two paths could not add up, suppose that the Δ G * β , shear > Δ G * β , N.A.…”

Section: Resultsmentioning

confidence: 99%

Exploring the polymorphic behavior of a β‐nucleated propylene‐ethylene random copolymer under shear flow

Zhang

Liu

Zhao

et al. 2020

Polymer Crystallization

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Shear flow strongly affects the polymorphism and crystallization kinetics of semicrystalline polymers. In the present work, the crystallization behavior of a β-nucleated propylene-ethylene (P-E) random copolymer was studied both under quiescent and shear flow by using in-situ wide-angle X-ray diffraction. It was observed that shear flow could shorten the induction time, fasten the crystallization rate and increase the degree of crystallinity. The populations of different crystal modifications varied significantly upon shearing. Especially the β crystals fraction decreased with shear strain.When the shear strain was higher than 100 with a fixed shear rate of 5 s −1 , the β crystals almost disappeared. Meanwhile, both the fractions and the crystallization rates of α and γ crystals were enhanced by shear flow. The complicated polymorphic behavior can be interpreted by the nucleation kinetics.

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Section: Resultsmentioning

confidence: 99%

Exploring the polymorphic behavior of a β‐nucleated propylene‐ethylene random copolymer under shear flow

Zhang

Liu

Zhao

et al. 2020

Polymer Crystallization

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“…Instead, the results can be regarded as the evidence of a synergetic rule for added CNTs and shear flow on the acceleration of crystallization kinetics for CNT/iPP nanocomposites, as mentioned in other reports. 36,39 However, the studies in those reports only mentioned the synergetic effect of added CNTs and shear flow on the overall crystallization kinetics, and the synergetic effect on the changes of nucleation density was not analyzed or quantified.…”

Section: Relaxation Behaviors Of Cnt/ipp Nanocompositesmentioning

confidence: 99%

More Dominant Shear Flow Effect Assisted by Added Carbon Nanotubes on Crystallization Kinetics of Isotactic Polypropylene in Nanocomposites

Wang

Yang

Deng

et al. 2015

ACS Appl. Mater. Interfaces

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More dominant shear flow effect with different shear rates and shear time with assistance of added carbon nanotubes (CNTs) of low amounts on the crystallization kinetics of isotactic polypropylene (iPP) in CNT/iPP nanocomposites was investigated by applying differential scanning calorimetry (DSC), polarized optical microscopy (POM), and rheometer. CNTs were chemically modified to improve the dispersity in the iPP matrix. CNT/iPP nanocomposites with different CNT contents were prepared by solution blending method. The crystallization kinetics for CNT/iPP nanocomposites under the quiescent condition studied by DSC indicates that the addition of CNTs of low amounts significantly accelerates crystallization of iPP due to heterogeneous nucleating effect of CNTs, whereas a saturation effect exists at above a critical CNT content. The shear-induced crystallization behaviors for CNT/iPP nanocomposites studied by POM and rheometry demonstrate the continuously accelerated crystallization kinetics with assistance from added CNTs, with increasing CNT content, shear rate, and shear time, without any saturation effect. The changes of nucleation density for CNT/iPP nanocomposites under different shear conditions can be quantified by using a space-filling modeling from the rheological measurements, and the results illustrate that the combined effects of added CNTs and shear flow on the acceleration of crystallization kinetics are not additive, but synergetic. The mechanisms for the synergetic effect of added CNTs and shear flow are provided.

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“…Most of the studies on the flow-induced crystallization have been done on the pure polymers. However, flow-induced crystallization in the presence of nanoparticles is much more complex than that in the pure polymer [29][30][31][32][33][34][35][36]. Since particles disturb the flow filed, a significant effect of presence of particles on the flow-induced crystallization is expected.…”

Section: Introductionmentioning

confidence: 99%

Flow-induced crystallization of polypropylene in the presence of graphene nanoplatelets and relevant mechanical properties in nanocompsoite fibres

Kalantari

Mojtahedi

Sharif

et al. 2015

Composites Part A: Applied Science and Manufacturing

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On the Effect of Particle Size, Shape, Concentration, and Aggregation on the Flow-Induced Crystallization of Polymers

Cited by 42 publications

References 67 publications

Exploring the polymorphic behavior of a β‐nucleated propylene‐ethylene random copolymer under shear flow

Exploring the polymorphic behavior of a β‐nucleated propylene‐ethylene random copolymer under shear flow

More Dominant Shear Flow Effect Assisted by Added Carbon Nanotubes on Crystallization Kinetics of Isotactic Polypropylene in Nanocomposites

Flow-induced crystallization of polypropylene in the presence of graphene nanoplatelets and relevant mechanical properties in nanocompsoite fibres

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