Homogeneous Crystallization of Poly(Ethylene Oxide) Confined to Droplets: The Dependence of the Crystal Nucleation Rate on Length Scale and Temperature

Massa, Michael V.; Dalnoki-Veress, Kari

doi:10.1103/physrevlett.92.255509

Cited by 184 publications

(161 citation statements)

References 26 publications

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“…We find that the longer block length samples (R % 12.5 nm) crystallize and melt at higher temperatures than the shorter PEO block samples (R % 8.3 nm). The change in T c with R, shown in Figure 2(a), is consistent with our previous findings for larger volume droplets, 18 for which homogeneous nucleation was found to scale with the volume of the domain.…”

Section: Resultssupporting

confidence: 80%

“…In our earlier work, we investigated how the nucleation rate scales with the domain size. 18 For the study presented here, we compare two diblocks that differ only in the length of the poly (ethylene oxide) (PEO) block. Given the uniformity of the domain sizes in the phase-separated block copolymers, this is an ideal system for a size comparison of nucleation kinetics.…”

Section: Introductionmentioning

confidence: 99%

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Ellipsometry as a probe of crystallization kinetics in thin diblock copolymer films

Carvalho

Massa

Dalnoki-Veress

2006

J Polym Sci B Polym Phys

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ABSTRACT:We present results on the use of ellipsometry as a novel probe for the crystallization kinetics in thin films of a diblock copolymer. Ellipsometry makes use of the change in polarization induced upon the reflection of light from a film-covered substrate to enable the calculation of the refractive index and thickness of the film. The information obtained with these measurements can be compared with information from differential scanning calorimetry, with the additional advantages that small sample volumes and slow cooling rates can be employed and that expansion coefficients can be determined. By studying the temperature dependence of these quantities, we are able to measure the crystallization kinetics within very small volumes ($10 À10 L) of a poly(butadiene-b-ethylene oxide) diblock copolymer. Through a comparison of two different poly (ethylene oxide) block lengths, we demonstrate a reduction in both the crystallization and melting temperatures as the domain volume is reduced.

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Section: Resultssupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Ellipsometry as a probe of crystallization kinetics in thin diblock copolymer films

Carvalho

Massa

Dalnoki-Veress

2006

J Polym Sci B Polym Phys

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“…And there has a clearly connection between the homogeneous nucleation crystallization temperature and the microdomain size. 7,34 In this study, the homogeneous nucleation crystallization temperature of PEO in the blend is 158C higher than that of PEO block in the copolymer. This suggests that the domain size increases upon adding h-PEO in the blend because of the dry-brush blending.…”

Section: Introductionmentioning

confidence: 79%

Crystallization behavior of dry‐brush PEO‐PS block copolymer and PEO homopolymer blend

Gao

Liu

2007

J of Applied Polymer Sci

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The crystallization behavior of semicrystalline PEO homopolymer/triblock PS-PEO-PS copolymer blend system, which exhibited ''Dry-Brush'' in the melt. A symmetric polystyrene-poly(ethylene oxide)-polystyrene triblock copolymer was blended with PEO homopolymer (h-PEO) having the same molecular weight as that of the PEO block in the copolymer. Considering the composition of the blend (W ps 0.8), PEO spheres were formed in the blend. Because of the dry-brush phase behavior of this blend, h-PEO added was localized in the PEO microdomains, which increases the domain size without changing the microdomain morphology. The crystallization of PEO block was confined within the microdomains and the crystallization temperature was about 608C lower than normal. Self-seeding tests were performed to clarify the nucleation mechanism of the blend. Because the droplets size varies greatly, multicrystallization peaks were witnessed in the self-seeding process.

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“…the colloids are glassy. The homogeneous nucleation rate of crystals depends on the volume and the viscosity of the material [41][42][43] . In macroscopic samples crystallisation mainly occurs by heterogeneous nucleation at impurities which lower the free energy of forming a crystal-amorphous interface.…”

Section: Discussionmentioning

confidence: 99%

Low temperature crystallisation of mesoporous TiO2

et al. 2013

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Conducting mesoporous TiO 2 is gaining rapidly in importance for the manufacture of green energy applications. To optimise performance, its porosity and crystallinity must be carefully fine-tuned. To this end, we have performed a detailed study on the temperature dependence of TiO 2 crystallisation in mesoporous films. Crystal nucleation and growth of initially amorphous TiO 2 derived by hydrolytic sol-gel chemistry is compared to the evolution of crystallinity from nanocrystalline building blocks obtained from non-hydrolytic sol-gel chemistry, and mixtures thereof. Our study addresses the question whether the critical temperature for crystal growth can be lowered by the addition of crystalline nucleation seeds.

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Homogeneous Crystallization of Poly(Ethylene Oxide) Confined to Droplets: The Dependence of the Crystal Nucleation Rate on Length Scale and Temperature

Cited by 184 publications

References 26 publications

Ellipsometry as a probe of crystallization kinetics in thin diblock copolymer films

Ellipsometry as a probe of crystallization kinetics in thin diblock copolymer films

Crystallization behavior of dry‐brush PEO‐PS block copolymer and PEO homopolymer blend

Low temperature crystallisation of mesoporous TiO2

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