Epoxy/poly(ɛ‐caprolactone) nanocomposites: Effect of transformations of structure on crystallization

Kratochvíl, Jaroslav; Rotrekl, Jakub; Kaprálková, Ludmila; Hromádková, Jiřina; Kelnar, Ivan

doi:10.1002/app.39536

Cited by 13 publications

(5 citation statements)

References 45 publications

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“…using the melting enthalpy for PCL ( ΔH i , D ) obtained by the deconvolution. The melting enthalpy of the completely crystalline PCL, ΔH PCL o , and PCL mass fraction, w PCL , in the blend were 139.3 J g −1 (as previously reported) and 0.33, respectively.

Δ H_{i} = \frac{{Δ H}_{i 0}}{w_{italicnp}}

x_{c} = \frac{{Δ H}_{i, D}}{w_{PCL} {Δ H}_{PCL}^{o}}

…”

Section: Methodssupporting

confidence: 75%

Aluminosilicate nanofibers with ordered pores derived from block copolymer electrospun nanofibers

Dorneles

Oréfice

2018

J of Applied Polymer Sci

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The self-assembling phenomenon of block copolymers (BCPs) can be used to spatially organize inorganic entities to create chemical patterns that can be converted into high-surface area materials. In this study, electrospun nanofibers with ordered phases were designed and prepared using BCPs as the templates to control the distribution of inorganic nanoparticles (NPs). To this end, blends of Pluronic F127 BCP and poly(caprolactone) (in a 2:1 ratio) containing different amounts of aluminosilicate NPs (obtained through a sol-gel process) were electrospun. The nanofibers thus produced were pyrolyzed at 600 C. The results indicated that the inorganic NPs were selectively located within the more hydrophilic domains of the BCP. The small angle X-ray scattering results showed that the amount of inorganic NPs incorporated in the nanofibers affected the morphology of the BCPs, yielding structures ranging from lamellae to hexagonal array of cylinders. After pyrolysis, aluminosilicate-rich fibers with a hexagonal array of cylindrical pores were obtained.

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Δ H_{i} = \frac{{Δ H}_{i 0}}{w_{italicnp}}

x_{c} = \frac{{Δ H}_{i, D}}{w_{PCL} {Δ H}_{PCL}^{o}}

…”

Section: Methodssupporting

confidence: 75%

Aluminosilicate nanofibers with ordered pores derived from block copolymer electrospun nanofibers

Dorneles

Oréfice

2018

J of Applied Polymer Sci

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“…The difference of the samples containing PLA from neat PCL is insignificant. The PCL/PLA interface apparently suppresses negative effect of the filler on quality of PCL crystallites[25]. T m of PCL/C15 is lower than that of PCL/PLA (α ≥ 0.99) and also than that of remaining two samples (α ≥ 0.95).…”

mentioning

confidence: 81%

A simple method of evaluating non-isothermal crystallization kinetics in multicomponent polymer systems

Kratochvíl

Kelnar

2015

Polymer Testing

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“…The crystallization behavior including nucleation mechanism, Tc, Tm, crystallinity (Xc), crystal orientation and crystallization rate are significantly altered by these two effects, determining the ultimate properties of PNCs. Therefore, the Heat Flow, Endo Up (mW) crystallization of polymers confined by nanofillers has become a hot research topic for both scientific and industrial communities in the last two decades [281][282][283][284][285][286][287][288][289][290][291][292][293][294][295][296][297][298][299][300].…”

Section: Nanocompositesmentioning

confidence: 99%

Fractionated crystallization in semicrystalline polymers

Sangroniz

Wang

et al. 2021

Progress in Polymer Science

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The crystallization of heterogeneously nucleated bulk polymers typically occurs in a single exothermic process, within a narrow temperature range, i.e., a single exothermic peak is detected by Differential Scanning Calorimetry when the material is cooled from the melt. However, when a bulk semicrystalline polymer is subdivided or dispersed into a multitude of totally (or partially) isolated microdomains (e.g., droplets or cylinders), in number comparable to that of commonly available nucleating heterogeneities, several separated crystallization events are typically observed, i.e., fractionated crystallization. This situation is often found for the minor crystallizable component in immiscible blends.When the bulk polymer is dispersed into a number of microdomains that is several orders of magnitude higher than the available number of heterogeneities within it, most microdomains will be heterogeneity-free. In these clean microdomains the nucleation can occur by contact with the interfaces (i.e., surface nucleation) or by homogeneous nucleation inside the microdomain volume. These cases can be easily encountered in cylinders or spheres within strongly segregated block copolymers, or in infiltrated polymers within nanopores of alumina templates.In this work, a comprehensive review of the known cases of fractionated crystallization is provided. The changes upon decreasing microdomain sizes from a dominant single heterogeneous nucleation, through fractionated crystallization, to surface or homogeneous nucleation are critically reviewed. Emphasis is placed on the common features of the phenomenon across the different systems, and thus on the general conclusions that can be drawn from the analysis of representative semicrystalline polymers. The origin of the fractionated crystallization effects and their dramatic consequences on the nucleation and crystallization kinetics of semicrystalline polymers are also discussed.

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Epoxy/poly(ɛ‐caprolactone) nanocomposites: Effect of transformations of structure on crystallization

Cited by 13 publications

References 45 publications

Aluminosilicate nanofibers with ordered pores derived from block copolymer electrospun nanofibers

Aluminosilicate nanofibers with ordered pores derived from block copolymer electrospun nanofibers

A simple method of evaluating non-isothermal crystallization kinetics in multicomponent polymer systems

Fractionated crystallization in semicrystalline polymers

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