Crystallization of Polymer Blends

Pracellà, Mariano

doi:10.1002/9781118541838.ch10

Cited by 18 publications

(22 citation statements)

References 121 publications

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“…Clear relationships have been found between blend morphology and the crystallization of immiscible polymers [8][9][10][11][12][13]. We have selected an example from the literature, even if the reported blends are not biobased or biodegradable, because it can clearly illustrate the large changes produced by different morphologies on the nucleation and crystallization of the phases.…”

Section: Morphological Featuresmentioning

confidence: 99%

“…The same does not obviously hold for miscible blends, where dilution effects on crystallization can be appreciated. [10,11,13].…”

Section: Crystallization Behavior In Immiscible Blendsmentioning

confidence: 99%

“…Indeed, nucleation is commonly encountered at foreign surfaces, and it can thus be increased due to impurities/heterogeneities migration between the different phases during the blending process or to the presence of polymer/polymer interfaces. [1,2,10,[13][14][15][16][17]. The opposite situation, i.e., a decrease of crystallization kinetics, is also commonly observed whenever the crystallizable polymers are separated in a "sufficiently high" number of individual domains.…”

Section: Crystallization Behavior In Immiscible Blendsmentioning

confidence: 99%

“…Heterogeneity free droplets can also crystallize by interfacial nucleation at high supercoolings, but not as high as in the case of homogeneous nucleation, since the energy barrier for nucleation is lower when the interface between the two phases is able to nucleate the droplets. The different nucleation events are reflected in multiple exothermic peaks detected by a differential scanning calorimetry (DSC) cooling scan [10,12,13,[19][20][21][22][23][24][25][26][27][28][29].…”

Section: Fractionated Crystallizationmentioning

confidence: 99%

“…which could be started by surface nucleation or homogeneous nucleation. As the glass transition temperature (Tg) temperature of iPP is close to 0 ºC and the crystallization peak (D) is at around 40 ºC, it may be possible that a homogeneous nucleation process could have triggered the nucleation of these clean droplets [8,10,12,21,23,24]. In general, the fractionated…”

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confidence: 99%

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Nucleation and Crystallization in Bio-Based Immiscible Polyester Blends

Fenni

Cavallo

Müller

2019

Advances in Polymer Science

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Bio-based thermoplastic polyesters are highly promising materials as they combine interesting thermal and physical properties and in many cases biodegradability. However, sometimes the best property balance can only be achieved by blending in order to improve barrier properties, biodegradability or mechanical properties. Nucleation, crystallization and morphology are key factors that can dominate all these properties in crystallizable biobased polyesters. Therefore, their understanding, prediction and tailoring is essential. In this work, after a brief introduction about immiscible polymer blends, we summarize the crystallization behavior of the most important bio-based (and immiscible) polyester blends, considering examples of double-crystalline components. Even though in some specific blends (e.g., polylactide/polycaprolactone) many efforts have been made to understand the influence of blending on the nucleation, crystallization and morphology of the parent components, there are still many points that have yet to be understood. In the case of other immiscible polyester blends systems, the literature is scarce, opening up opportunities in this environmentally important research topic.

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Section: Morphological Featuresmentioning

confidence: 99%

“…The same does not obviously hold for miscible blends, where dilution effects on crystallization can be appreciated. [10,11,13].…”

Section: Crystallization Behavior In Immiscible Blendsmentioning

confidence: 99%

Section: Crystallization Behavior In Immiscible Blendsmentioning

confidence: 99%

Section: Fractionated Crystallizationmentioning

confidence: 99%

mentioning

confidence: 99%

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Nucleation and Crystallization in Bio-Based Immiscible Polyester Blends

Fenni

Cavallo

Müller

2019

Advances in Polymer Science

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Crystallization and Melting Behavior in Polymer Blends

Jabarin

Majdzadeh‐Ardakani

Lofgren

2016

Encyclopedia of Polymer Blends

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Nucleation modalities in poly(lactide), poly(butylene succinate), and poly(ε‐caprolactone) ternary blends with partial wetting morphology

Fenni

Wang

Haddaoui

et al. 2020

Polymer Crystallization

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Ternary biodegradable polymer blends of poly(lactic acid) (PLA), poly(butylene succinate) (PBS), and poly(ε-caprolactone) (PCL) with the composition 45/10/45 wt% and exhibiting partial-wetting morphology were prepared. In this morphology, the minor phase is present as self-assembled droplets at the co-continuous interface of the other two major phases. The crystallization of the components in the various blends was thoroughly investigated. Differential scanning calorimetry highlighted minor differences in the overall kinetics of a given component in the ternary blend, with respect to the neat polymer. On the other hand, several unusual nucleation mechanisms could be studied by polarized optical microscopy (PLOM). With reference to the major phases, PLA spherulites displayed surface-induced nucleation from the interface with molten PBS or PCL droplets. On lowering the crystallization temperature, the PBS phase effectively nucleated at the interface with previously crystallized PLA domains, forming a transcrystalline morphology. Concerning the minor phase, weak partial-wetting PBS droplets displayed a droplet-to-droplet percolation of the nucleation events. Strongly partial-wetting PCL droplets were confined between previously crystallized PLA and PBS co-continuous phases and, instead, solidified as isolated domains randomly in space. This work provides further insights in the relationship between morphology and crystallization in immiscible ternary blends.

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Crystallization of Polymer Blends

Cited by 18 publications

References 121 publications

Nucleation and Crystallization in Bio-Based Immiscible Polyester Blends

Nucleation and Crystallization in Bio-Based Immiscible Polyester Blends

Crystallization and Melting Behavior in Polymer Blends

Nucleation modalities in poly(lactide), poly(butylene succinate), and poly(ε‐caprolactone) ternary blends with partial wetting morphology

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