Crystallization Behavior of Semicrystalline Immiscible Polymer Blends

Tien, Nguyen Duc; Prud’homme, Robert E.

doi:10.1016/b978-0-12-809453-2.00007-4

Cited by 20 publications

(25 citation statements)

References 91 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%

“…results in large decrease in the size of the dispersed phase, in comparison with the non-compatibilized blend. The addition of a copolymer-based compatibilizer, in general, has remarkable influence on the crystallization behavior of the blend components, because of the large effect on the morphology of the system, which results either in a decrease in the size of the dispersed phase or in the formation of a percolated/cocontinuous morphology [8,13,16,38,39]. Tol et al [26], Yordanov and Minkova [28], studied the reactive compatibilization of the immiscible blends polystyrene/polyamide 6 (PS/PA6) and Low density polyethylene/polystyrene (LDPE/PS), using different kind of copolymer compatibilizers.…”

Section: Crystallization In Presence Of Compatibilizers and Nanopartimentioning

confidence: 99%

See 4 more Smart Citations

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%

Section: Crystallization In Presence Of Compatibilizers and Nanopartimentioning

confidence: 99%

See 3 more Smart Citations

Nucleation and Crystallization in Bio-Based Immiscible Polyester Blends

Fenni

Cavallo

Müller

2019

Advances in Polymer Science

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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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Immiscible PHB/PBS and PHB/PBSA blends: morphology, phase composition and modelling of elastic modulus

Righetti

Cinelli

Aliotta

et al. 2021

Polymer International

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This paper reports the thermal, morphological and mechanical properties of environmentally friendly poly(3-hydroxybutyrate) (PHB)/poly(butylene succinate) (PBS) and PHB/poly[(butylene succinate)-co-(butylene adipate)] (PBSA) blends, prepared by melt mixing. The blends are known to be immiscible, as also confirmed by the thermodynamic analysis here presented. A detailed quantification of the crystalline and amorphous fractions was performed, in order to interpret the mechanical properties of the blends. As expected, the ductility increased with increasing PBS or PBSA amount, but in parallel the decrease in the elastic modulus appeared limited. Surprisingly, the elastic modulus was found properly described by the rule of mixtures in the whole composition range, thus attesting mechanical compatibility between the two blend components. This unusual behavior has been explained as due to co-continuous morphology, present in a wide composition range, but also at the same time as the result of shrinkage occurring during sequential crystallization of the two components, which can lead to physical adhesion between matrix and dispersed phase. For the first time, the elastic moduli of the crystalline and mobile amorphous fractions of PBS and PBSA and of the mobile amorphous fraction of PHB at ambient temperature have been estimated through a mechanical modelling approach.

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Crystallization Behavior of Semicrystalline Immiscible Polymer Blends

Cited by 20 publications

References 91 publications

Nucleation and Crystallization in Bio-Based Immiscible Polyester Blends

Nucleation and Crystallization in Bio-Based Immiscible Polyester Blends

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

Immiscible PHB/PBS and PHB/PBSA blends: morphology, phase composition and modelling of elastic modulus

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