The influence of chain defects on the crystallisation behaviour of isotactic polypropylene

Meer, D.W. van der; Varga, J.; Vancso, Gyula J.

doi:10.3144/expresspolymlett.2015.23

Cited by 17 publications

(15 citation statements)

References 47 publications

(91 reference statements)

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“…[32] GPC measurements were performed as previously described. [32] 3 | RESULTS AND DISCUSSION It was shown by van der Meer et al [38] that, among other characteristics, the crystal growth rate (G) of iPP decreases with increasing amount of regiodefects. The reduction of G by more than one order of magnitude shown here is actually stronger than what was found for a series of ethylene-propylene random copolymers up to 4.9 wt% of comonomer.…”

Section: Methodsmentioning

confidence: 99%

Influence of 2,1‐erythro regiodefects on the crystallization behavior of isotactic polypropylene

Tranchida

Resconi

2018

Polymer Crystallization

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We produced isotactic polypropylene (iPP) samples with metallocene catalysts, containing 2,1‐erythro regiodefects between ∼0% and 3.4% and only trace amounts of stereodefects, and studied their thermal properties in order to quantify the influence of regiodefects on the crystallization behavior of iPP. Isothermal and nonisothermal experiments performed on these samples show that increasing the regiodefects content proportionally slows down crystallization rate, apparently without phase transitions or additional phenomena. The analysis of the rigid amorphous fraction and the mobile amorphous fraction however reveals a different behavior of samples containing more than ∼1.5% regiodefects, related to the inclusion of these defects in the lamellae. Additionally, the wide range of regiodefects and a novel calculation approach allowed us to estimate the equilibrium melting temperature of a fully iPP free of defects to be 206°C .

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Section: Methodsmentioning

confidence: 99%

Influence of 2,1‐erythro regiodefects on the crystallization behavior of isotactic polypropylene

Tranchida

Resconi

2018

Polymer Crystallization

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“…Its chain structure can contain randomly distributed stereo and/or regio defects. In this sence, van der Meer et al [18] found that the crystal growth rate decreases linearly with the fraction of defects, but it is more affected by the presence of regio defects than stereo defects.…”

Section: Nonisothermal Crystallization Behavior Of Ipp Compositesmentioning

confidence: 96%

Effect of Different Nucleating Agents on the Crystallization of Ziegler-Natta Isotactic Polypropylene

Ávalos-Belmontes

Ramos-deValle²,

Espinoza‐Martínez³

et al. 2016

International Journal of Polymer Science

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Ziegler-Natta isotactic polypropylene (iPP) was melt mixed with four different nucleating agents (carbon nanotubes (CNT), carbon nanofibers (CNF), lithium benzoate (LiBe), and a sorbitol derivative (Millad)) in order to study their effect on the crystallization of iPP. It was found that the four different nucleating agents promote the alpha crystalline form. At 0.01 wt%, the carbon nanoparticles produced the higher crystallization temperature “Tc” (~119°C), whereas, at 0.10 wt%, LiBe and Millad produced a markedly higherTc(~125°C).Tcof pure iPP was 111°C. With 0.1 wt% nucleating agent, at 120°C, the crystallization half-life time of PP, when using LiBe or Millad, was 15 times faster than for pure PP, whereas, when using carbon nanoparticles, it was 20–25 times faster. At 135°C, with 0.01 wt% nucleating agent, the isothermal crystallization process of iPP was completed after 25 min, as well as with Millad. With LiBe, it was completed after just 15 min and, with any of the carbon nanoparticles, it was practically over after only a couple of minutes.

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“…The change of the chain regularity through comonomers, stereodefects or regio-defects often is related to the decrease of the crystal growth rate of the α phase, [76][77][78] which is incidentally generally accompanied by increasing crystallization in γ phase. [79,80] An exception seems to be the presence of butene as comonomer at concentrations higher than 10 mol%.…”

Section: Polymer-based Crystallinity Modificationsmentioning

confidence: 99%

Designing polymer crystallinity: An industrial perspective

Mileva

Tranchida

Gahleitner

2018

Polymer Crystallization

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More than 50% of the thermoplastic polymers applied globally are semi‐crystalline, making crystallization part of the material and component design process for these materials. The mechanical and optical performance, but also the long‐term stability of the final articles and applications will depend upon three major groups of influence factors: Polymer structure and monomer composition, additive addition (especially nucleation) and blending with secondary components, and processing parameters. In the present review, we try to establish a connection between these three areas, the resulting combination of crystallinity and morphology, and the final application properties. Examples are drawn from the two major polyolefins, polyethylene and polypropylene, technical polymers like polyamide and polyester, but also polymers from renewable sources like poly(lactic acid).

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The influence of chain defects on the crystallisation behaviour of isotactic polypropylene

Cited by 17 publications

References 47 publications

Influence of 2,1‐erythro regiodefects on the crystallization behavior of isotactic polypropylene

Influence of 2,1‐erythro regiodefects on the crystallization behavior of isotactic polypropylene

Effect of Different Nucleating Agents on the Crystallization of Ziegler-Natta Isotactic Polypropylene

Designing polymer crystallinity: An industrial perspective

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