Crystallization of polymer chains confined in nanodomains

Nakagawa, Seiko; Marubayashi, Hironori; Nojima, Shuichi

doi:10.1016/j.eurpolymj.2015.07.018

Cited by 53 publications

(45 citation statements)

References 98 publications

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“…This possibly provides precise tuning possibilities with molecules somewhat richer in PEO which show more interaction with microphases or position near their interfaces. It is indeed known that chain confinement at domain interfaces in block copolymers influences crystallization . This has not been yet specifically described in connection to gas separation membranes.…”

Section: Resultsmentioning

confidence: 99%

Blending PPO‐based molecules with Pebax MH 1657 in membranes for gas separation

Didden

Thür

Volodin

et al. 2018

J of Applied Polymer Sci

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This work explores the possibilities to blend block copolymers, i.e., Pebax MH 1657, with a variety of cheap poly(propylene oxide)‐rich molecules which could potentially play a double role in the resulting membranes as dispersing/stabilizing agents in multi‐component casting solutions and as a gas transport medium in the final membrane. These membranes were prepared by solution casting and were characterized by differential scanning calorimetry, scanning electron microscopy, atomic force microscopy, X‐ray diffraction, density measurements, and Fourier transform infrared‐attenuated total reflection, while additive incorporation was also studied with theoretical calculations. Gas permeation measurements showed that this approach resulted in increased permeabilities at the expense of mixed‐gas selectivity. An interpretation of the blend structure was finally made using gas transport models. The compatibility of these additives with the synthesis of selective gas separation membranes may enable a potential double role in membrane synthesis, i.e., as stabilizing agents in membrane synthesis and as a gas transport medium in the final membrane. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46433.

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Section: Resultsmentioning

confidence: 99%

Blending PPO‐based molecules with Pebax MH 1657 in membranes for gas separation

Didden

Thür

Volodin

et al. 2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

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“…Similar results were found with PE‐ b ‐PLLA for PLLA crystallization with amorphous PE fraction; however, PLLA crystals were oriented with the c ‐axis parallel to the interface normal . The developed orientation is related to the nucleation density as well, and therefore, it has a slight isothermal T c dependence …”

Section: Conventional Crystallizable Diblock Copolymersmentioning

confidence: 99%

“…Whether block copolymer crystallization occurs from the miscible bulk, through CDSA in solution, or within microdomains, these systems provide novel structures to study fundamental behavior, such as nucleation and growth, thermodynamic stability, growth kinetics, crystallization in confinement, etc, where there still are many unanswered questions in the area of polymer crystallization . These include nucleation and growth mechanisms and the role of junction or tethering points in these processes, thermodynamics (energetics) of crystal size, domain size, and noncrystallized block chain structure, finding universal parameters to predict crystallization behavior by deconvoluting BCP composition (mass or volume fraction), local environment (concentration, confinement, etc), and chain dynamic effects, and controlled assembly and disassembly of BCPs or crystallized BCPs in multi‐component systems.…”

Section: Introductionmentioning

confidence: 99%

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Recent progress in block copolymer crystallization

Horn

Steffen

O'Connor

2018

Polymer Crystallization

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Block copolymers (BCPs) are important for technological advances in numerous industries, including but not limited to, electronics, biomedical, optics, environmental, and infrastructure. Because of their ubiquity, it is important to understand their hierarchical phase behavior to tune their macroscopic properties for efficient use. These macroscopic properties are derived from the microscopic self‐assembled structures. One unique form of hierarchical assembly exists when one or more of the polymeric blocks form lamellar crystals. These crystals are integral to understanding and predicting the macroscopic behavior. This review reports on recent advances in crystallization of BCPs, including bulk and solution assembly. Reports highlighting development in fundamental processes regarding crystallization mechanisms and behavior as well as for the design of practical applications are included.

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“…Recently, crystallization of polymer in confined space has received significant attention . The nanoconfinement may frustrate the crystal growth and, in turn, results in obvious deviation of the crystallization behavior from that known for the bulk conditions.…”

Section: Introductionmentioning

confidence: 99%

Confinement‐driven cocrystallization of binary polymer mixtures of different chain length in electrospun nanofibers

Samanta

Srivastava

Nandan

2018

Polymer Crystallization

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The effect of molecular weight on the crystallization behavior of poly(ethylene oxide) (PEO) confined in the glassy polystyrene (PS) matrix in electrospun nanofibers of PS/PEO blends were investigated. It was found that, irrespective of the PEO molecular weight, the crystallization behavior was fractionated when the weight fraction of PEO (wPEO) in the blend was 0.2, whereas purely homogeneous nucleated crystallization was observed when the wPEO ~ 0.1. Nevertheless, the nature of homogeneous nucleated crystallization was found to be significantly affected for very low molecular weight PEO in the blend nanofibers. The peak temperature of homogeneous nucleated crystallization was observed to shift to high supercoolings when the PEO molecular weight was decreased, and the effect was most pronounced for PEO with lowest molecular weight, that is, MPEO ~ 4000 g/mol. Furthermore, relaxation of PEO domains by thermally annealing the nanofibers above the glass transition temperature of PS resulted in an increased polydispersity in the PEO domain size when the PEO molecular weight was 4000 g/mol. This evidently led to the observation of dual homogeneous nucleated crystallization peaks which was not observed in blend nanofibers composed from PEO with MPEO ≥ 35 000 g/mol. The confinement was also found to impose a higher degree of mobility frustration on longer polymer chains such that the depression in the degree of crystallinity was significantly higher for high molecular weight PEO in the blend nanofibers. Furthermore, in the case of blend nanofibers containing mixture of two PEO with different molecular weights, the crystallization behavior was closely related to the dominant nucleation mechanism. Hence, in the case of blend nanofibers where the heterogeneous nucleation was the dominating crystallization mechanism, two melting peaks where observed revealing phase segregated crystallization behavior. However, the blend nanofibers which crystallized solely through homogeneous nucleation mechanism, the mixture of PEO fractions were found to cocrystallize as revealed from the observation of single melting peak. The cocrystallization was observed irrespective of the crystallization conditions and plausibly was a result of mobility restrictions imposed by the confinement at high degree of supercoolings.

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Crystallization of polymer chains confined in nanodomains

Cited by 53 publications

References 98 publications

Blending PPO‐based molecules with Pebax MH 1657 in membranes for gas separation

Blending PPO‐based molecules with Pebax MH 1657 in membranes for gas separation

Recent progress in block copolymer crystallization

Confinement‐driven cocrystallization of binary polymer mixtures of different chain length in electrospun nanofibers

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