Superheating of the melting kinetics in polymer crystals: a possible nucleation mechanism

Toda, Akihiko; Hikosaka, Masamichi; Yamada, Koji

doi:10.1016/s0032-3861(01)00733-9

Cited by 134 publications

(149 citation statements)

References 33 publications

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“…However, plotting the melting temperature versus the heating rate to power 0.2, yields a linear relationship ( Figure 2). Similar observations were reported by Toda et al [18] . However, unlike Toda et al,…”

Section: Resultssupporting

confidence: 92%

Segmental Mobility in the Non‐crystalline Regions of Semicrystalline Polymers and its Implications on Melting

Rastogi

Yao

Lippits

et al. 2009

Macromol. Rapid Commun.

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Detailed knowledge on chain mobility in polymers is of fundamental interest in order to understand their mechanical properties. As a specific example, the melting behavior of semicrystalline polyethylene can be studied by thermal analysis and NMR spectroscopy. In ultra high molecular weight polyethylene (UHMW-PE) crystallised via different routes, i.e., directly during polymerisation, from solution, or from the melt, and melted under different protocols, different melting processes involving detachment of stems from the crystals and cluster melting can be distinguished. Melting by the consecutive detachment of chain stems from the crystal substrate ultimately results in a melt state where chain dynamics for entanglement formation are much more restricted.

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Section: Resultssupporting

confidence: 92%

Segmental Mobility in the Non‐crystalline Regions of Semicrystalline Polymers and its Implications on Melting

Rastogi

Yao

Lippits

et al. 2009

Macromol. Rapid Commun.

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“…1). Similar observations are reported by Toda et al [5]. The true melting temperature is determined by extrapolation to the zero heating rate.…”

supporting

confidence: 82%

“…Investigation of this unique melting behavior of nascent UHMW-PE leads to the presence of a new time dependent melting process. The findings are that if the sample is given sufficient time melting occurs at much lower temperatures, this cannot be explained by superheating [5] effects alone. By controlled synthesis it is possible to vary the chain topology.…”

mentioning

confidence: 95%

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Melting Kinetics in Polymers

2006

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“…Also, for crystals that are surrounded by a gas or solid, surface melting is known to occur even at temperatures below the bulk melting point (i.e., premelting) (5). Nevertheless, recent studies demonstrate that solids can be superheated if surface melting is circumvented (4,(6)(7)(8)(9). For example, high superheating values were achieved by embedding nanocrystals of one substance into another material with a higher melting point (4,8).…”

Section: Gibbs-thomson Effect | Ice Recrystallization | Irreversible mentioning

confidence: 99%

Superheating of ice crystals in antifreeze protein solutions

Celik

Graham

Mok

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

127

126

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It has been argued that for antifreeze proteins (AFPs) to stop ice crystal growth, they must irreversibly bind to the ice surface. Surface-adsorbed AFPs should also prevent ice from melting, but to date this has been demonstrated only in a qualitative manner. Here we present the first quantitative measurements of superheating of ice in AFP solutions. Superheated ice crystals were stable for hours above their equilibrium melting point, and the maximum superheating obtained was 0.44°C. When melting commenced in this superheated regime, rapid melting of the crystals from a point on the surface was observed. This increase in melting temperature was more appreciable for hyperactive AFPs compared to the AFPs with moderate antifreeze activity. For each of the AFP solutions that exhibited superheating, the enhancement of the melting temperature was far smaller than the depression of the freezing temperature. The present findings clearly show that AFPs adsorb to ice surfaces as part of their mechanism of action, and this absorption leads to protection of ice against melting as well as freezing.Gibbs-Thomson effect | ice recrystallization | irreversible binding | melting hysteresis | thermal hysteresis

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Superheating of the melting kinetics in polymer crystals: a possible nucleation mechanism

Cited by 134 publications

References 33 publications

Segmental Mobility in the Non‐crystalline Regions of Semicrystalline Polymers and its Implications on Melting

Segmental Mobility in the Non‐crystalline Regions of Semicrystalline Polymers and its Implications on Melting

Melting Kinetics in Polymers

Superheating of ice crystals in antifreeze protein solutions

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