Cooperative progress of crystallization and spinodal decomposition in the blends of dissimilar polycarbonates

Takamatsu, Koudai; Saito, Hiromu

doi:10.1016/j.polymer.2021.124418

Cited by 7 publications

(4 citation statements)

References 55 publications

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“…The accelerated crystallization kinetics caused by an initial amorphous demixing are also consistent with publications of experiments on polymer-polymer blends. [70][71][72] It has been suggested that the rate of transformation is enhanced due to so-called up-hill diffusion of polymer chains into their corresponding majority phase where the thermodynamic driving force for crystallization is stronger. This corresponds to the mechanism observed in the present simulations.…”

Section: Discussion -Comparison With Experimental Results For Opv Sys...mentioning

confidence: 99%

Crystalline morphology formation in phase-field simulations of binary mixtures

Siber,

Ronsin,

Harting

2023

J. Mater. Chem. C

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Section: Discussion -Comparison With Experimental Results For Opv Sys...mentioning

confidence: 99%

Crystalline morphology formation in phase-field simulations of binary mixtures

Siber,

Ronsin,

Harting

2023

J. Mater. Chem. C

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“…The Q Vv attained a first maximum before the Q Hv started to increase, indicating that the first increase in the Q Vv is attributed to only density fluctuation without optical anisotropy. Since the induction period was seen in the increase in the Vv light scattering intensity, the evolution of the density fluctuation is not attributed to the liquid-liquid phase separation via spinodal decomposition, which occurs spontaneously without an induction period of the Vv light scattering intensity [39]. The Q Vv attained a second maximum when the Q Hv reached half the value of that at the completion of the crystallization.…”

Section: Two-stage Evolution Of the γ-Phase Spherulitesmentioning

confidence: 98%

Two-Stage Evolution of Gamma-Phase Spherulites of Poly (Vinylidene Fluoride) Induced by Alkylammonium Salt

Miyashita

Saito

2022

Polymers

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We investigated the evolution of the γ-phase spherulites of poly(vinylidene fluoride) (PVDF) added to 1 wt% of tetrabutylammonium hydrogen sulfate during the isothermal crystallization at 165 °C through polarized optical microscopy and light scattering measurements. Optically isotropic domains grew, and then optical anisotropy started to increase in the domain to yield spherulite. Double peaks were seen in the time variation of the Vv light scattering intensity caused by the density fluctuation and optical anisotropy, and the Hv light scattering intensity caused by the optical anisotropy started to increase during the second increase in the Vv light scattering intensity. These results suggest the two-stage evolution of the γ-phase spherulites, i.e., the disordered domain grows in the first stage and ordering in the spherulite increases due to the increase in the fraction of the lamellar stacks in the spherulite without a change in the spherulite size in the second stage. Owing to the characteristic crystallization behavior, the birefringence in the γ-phase spherulites of the PVDF/TBAHS was much smaller than that in the α-phase spherulites of the neat PVDF.

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“…Previous studies have primarily focused on polymer–polymer blends, with the crystallization and the phase separation 17–25 . In addition, many groups have examined networked polymer blends such as epoxy polymer blends, in which several monomers having different polymerization mechanisms are combined to form amorphous polymer blends 26–30 .…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have primarily focused on polymerpolymer blends, with the crystallization and the phase separation. [17][18][19][20][21][22][23][24][25] In addition, many groups have examined networked polymer blends such as epoxy polymer blends, in which several monomers having different polymerization mechanisms are combined to form amorphous polymer blends. [26][27][28][29][30] However, there have been few studies concerning the simultaneous polymerization of crystalline polymers in amorphous polymer matrices exhibiting polymerizationinduced phase separation.…”

Section: Introductionmentioning

confidence: 99%

Higher order structures and toughening mechanisms for simultaneously polymerized polymethacrylate/polyurethane

Kuwashiro,

Hatanaka,

Tao

et al. 2024

J of Applied Polymer Sci

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Amorphous polymer/crystalline polymer blends can be prepared via the simultaneous polymerization of polymethacrylate/polyurethane combinations. The relationship between higher order structures and fracture mechanisms in these blends must be uncovered to elucidate the source of the increased fracture toughness of such materials. The present work involves the production of blended polymethacrylate/polyurethane and assess the internal structures of these specimens using optical and electron microscopy. These observations reveal the presence of both spherulites and elastomeric phases. The spherulites consisting of the polyurethane and are several micrometers in diameter whereas the phase‐separated polyurethane elastomeric domains are approximately 100 nm in size. Multiple cracks, crack bridging and plastic deformation around the precrack tips of loaded specimens are evidently responsible for the increased toughness of these blends. The former two phenomena are attributed to the presence of spherulites while the plastic deformation of the methacrylate matrix is ascribed to cavitation of the polyurethane elastomeric phases in response to loading.

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Cooperative progress of crystallization and spinodal decomposition in the blends of dissimilar polycarbonates

Cited by 7 publications

References 55 publications

Crystalline morphology formation in phase-field simulations of binary mixtures

Crystalline morphology formation in phase-field simulations of binary mixtures

Two-Stage Evolution of Gamma-Phase Spherulites of Poly (Vinylidene Fluoride) Induced by Alkylammonium Salt

Higher order structures and toughening mechanisms for simultaneously polymerized polymethacrylate/polyurethane

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