On cross- and self-nucleation in seeded crystallization of isotactic poly(1-butene)

Cavallo, Dario; Gardella, Lorenza; Portale, Giuseppe; Müller, Alejandro J.; Alfonso, Giovanni Carlo

doi:10.1016/j.polymer.2013.06.051

Cited by 58 publications

(70 citation statements)

References 61 publications

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“…Increasing the number of crystals using a specific polymorphic modification is a practical option for improving the performance of a polymeric material [129][130][131][132][133][134][135][136][137][138].…”

Section: Self-nucleation and Preferential Polymorphismmentioning

confidence: 99%

“…On the other hand, Cavallo et al [129,130] studied in detail the self-nucleation and cross-crystallization between the polymorphic phases of poly(1-butene). Other studies based on the SN and control of polymorphism were performed for polyamide 11 [131], poly(vinylidenefluoride) [135,136], poly(butylene adipate) [138], and chocolate [137].…”

Section: Self-nucleation and Preferential Polymorphismmentioning

confidence: 99%

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Self-Nucleation of Crystalline Phases Within Homopolymers, Polymer Blends, Copolymers, and Nanocomposites

Michell

Múgica

Zubitur

et al. 2015

Advances in Polymer Science

123

303

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Self-nucleation (SN) is a special nucleation process triggered by selfseeds or self-nuclei that are generated in a given polymeric material by specific thermal protocols or by inducing chain orientation in the molten or partially molten state. SN increases the nucleation density of polymers by several orders of magnitude, producing significant modifications to their morphology and overall crystallization kinetics. In fact, SN can be used as a tool for investigating the overall isothermal crystallization kinetics of slow-crystallizing materials by accelerating the primary nucleation stage in a previous SN step. Additionally, SN can facilitate the formation of one particular crystalline phase in polymorphic materials. The SN behavior of a given polymer is influenced by its molecular weight, molecular topology, and chemical structure, among other intrinsic and extrinsic characteristics. This review paper focuses on the applications of DSC-based SN techniques to study the nucleation, crystallization, and morphology of different types of polymers, blends, copolymers, and nanocomposites.

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Section: Self-nucleation and Preferential Polymorphismmentioning

confidence: 99%

Section: Self-nucleation and Preferential Polymorphismmentioning

confidence: 99%

Self-Nucleation of Crystalline Phases Within Homopolymers, Polymer Blends, Copolymers, and Nanocomposites

Michell

Múgica

Zubitur

et al. 2015

Advances in Polymer Science

123

303

View full text Add to dashboard Cite

show abstract

“…24 Cross-nucleation has also been studied through molecular simulations for LennardJones [25][26][27] and Yukawa 28 crystals, and in methane clathrate a) Author to whom correspondence should be addressed. Electronic mail:…”

Section: Introductionmentioning

confidence: 99%

“…5,21,33 A complete picture of how a polymorph can grow on other crystal, or why is one form preferred over the other, is not yet available. 8,17,24,33 Previous studies indicate that faster growth rate of the new crystal is a necessary but not sufficient condition for cross-nucleation. 9,10,16,20 Defects 16 on the seed crystals as well as their crystallographic orientation 11 have been proposed to influence the possibility of cross-nucleation.…”

Section: Introductionmentioning

confidence: 99%

Cross-nucleation between clathrate hydrate polymorphs: Assessing the role of stability, growth rate, and structure matching

Nguyen

Molinero

2014

The Journal of Chemical Physics

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Cross-nucleation is a phenomenon where a new crystal nucleates and grows upon the surface of a different polymorph. Previous studies indicate that faster growth rate of the new crystal is a necessary but not sufficient condition for cross-nucleation. The thermodynamic stability of the different polymorphs can also affect cross-nucleation by modulating the rates of crystal growth. The interplay between thermodynamic stability of the polymorphs involved, the growth rate of the crystals, and the need for creation of an interfacial transition layer that seamlessly connects the two structures has not yet been fully elucidated. Predicting cross-nucleation is particularly challenging for clathrate hydrates, for which there are sometimes several polymorphs with similar stability and for which growth rates are not known. In this work, we use molecular dynamics simulations to investigate which factor (stability, growth rate, or formation of interfacial transition layer) controls cross-nucleation between the four known Frank-Kasper clathrate hydrate polymorphs: sI, sII, TS, and HS-I. We investigate the growth and cross-nucleation of these four hydrates filled with a set of guest molecules that produce different order of stabilities for the four crystal structures. We determine that the growth rate of sII clathrate is the fastest, followed by TS, HS-I, and sI. We find that cross-nucleation into or from sII clathrates is preceded by the formation of an interfacial transition layer at the seed crystal/liquid interface because sII does not share a crystal plane with sI, HS-I, or TS. Cross-nucleation between the latter three can occur seamlessly and is determined only by their growth rates. Our results indicate that nucleation of an interfacial transition layer between non-matching polymorphs can control cross-nucleation or lack thereof under conditions of small driving force. Under conditions of sufficient supercooling clathrate hydrate polymorphs cross-nucleate into the fastest growing phase even if that new phase is less stable and does not share a common crystal plane with the initial polymorph.

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“…Self‐nucleation (SN) method is a powerful method to probe the nucleation mechanism of semicrystalline polymers, nanocomposites and block copolymers, which was first proposed by Fillon et al . In this method, the polymer is first held at a high temperature for a certain time and then cooled at a constant rate to create a “standard state”.…”

Section: Introductionmentioning

confidence: 99%

Self‐nucleation behaviors of olefinic blocky copolymer/montmorillonite nanocomposites with collapsed and intercalated clay layers

Tong

Huang²,

Zhou

et al. 2014

J of Applied Polymer Sci

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The self‐nucleation behavior of olefinic blocky copolymer (OBC) / organically modified montmorillonite (OMMT) nanocomposites with a novel collapsed clay structure (c‐OMMT) was studied and compared with that of the nanocomposites with an intercalated clay structure (OBC/i‐OMMT). Their behaviors appear different in three temperature domains, Domain I (DI) in which the polymer is completely melted and only the heterogeneous nuclei are present, Domain II (DII) in which only self‐nucleation occurs and Domain III (DIII) where both self‐nucleation and annealing take place. As the OMMT loading increases, the boundary temperature of DI and DII (TI→II) shifts to lower temperature and DII becomes narrower. For the OBC/c‐OMMT nanocomposites, the TI→II or TI→III (the boundary temperature of DI and DIII) can be lower than the end melting temperature ( Tmend) and leads to appearance of a subdomain of DI, DI′, in which the self‐nuclei of un‐melted fragmental crystals exist but the following crystallization is still initiated by c‐OMMT. DII may even disappear at high c‐OMMT loadings. By contrast, the TI→II of the OBC/i‐OMMT nanocomposites is always approximate to or higher than the Tmend. DII does not disappear and no DI′ is observed for the OBC/i‐OMMT nanocomposites. The nucleation efficiency of c‐OMMT is also evidently higher than that of i‐OMMT. These results verify that the c‐OMMT has stronger nucleation ability than i‐OMMT at the same OMMT loading. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41771.

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On cross- and self-nucleation in seeded crystallization of isotactic poly(1-butene)

Cited by 58 publications

References 61 publications

Self-Nucleation of Crystalline Phases Within Homopolymers, Polymer Blends, Copolymers, and Nanocomposites

Self-Nucleation of Crystalline Phases Within Homopolymers, Polymer Blends, Copolymers, and Nanocomposites

Cross-nucleation between clathrate hydrate polymorphs: Assessing the role of stability, growth rate, and structure matching

Self‐nucleation behaviors of olefinic blocky copolymer/montmorillonite nanocomposites with collapsed and intercalated clay layers

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