Interface-Induced Coarsening Process in Polymer Blends

Xie, Xu‐Ming; Kong, Xiangming; Tianjing, Xiao; Yang, Yong; Gao, Ning; Tanioka, Akihiko

doi:10.1006/jcis.2000.7298

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…In our previous work, studying the interfaceinduced coarsening process in polymer blends and the study of the phase inversion of PS/PMMA thin films on different substrates, it was found that the substrate plays an important role in governing the structure and properties of polymer films. [23][24][25] Xie and co-workers [26] observed the surface morphology development of PS/PMMA-blend thin film in the presence of supercritical carbon dioxide (SCCO 2 ).…”

Section: Introductionmentioning

confidence: 99%

Inversion of Phase Morphology in Polymer‐Blend Thin Films on Glass Substrates

Xie

2004

Macro Chemistry & Physics

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Summary: The phase‐morphology inversion in two blend systems of polystyrene/poly(methyl methacrylate) (PS/PMMA) and polystyrene/poly(ε‐caprolactone) (PS/PCL) has been studied after their thin films were prepared on glass substrates by spin‐coating from a co‐solvent tetrahydrofuran (THF). Phase‐contrast microscopy (PCM), scanning‐electron microscopy (SEM) equipped with energy dispersive X‐ray spectroscopy (EDS), and atomic force microscopy (AFM) were used to obtain information on the morphology of the thin films during heat treatment. It was found that the PMMA‐rich and PCL‐rich phases are always continuous after annealing in either of the PS/PMMA and PS/PCL blend thin films, even though the PMMA and PCL are minor components in the blends. This should result from the better wetting abilities of PMMA and PCL on a glass substrate than PS in the blends. The effect of the viscosity in the evolution of the phase structure was also investigated by changing the molecular weight of PS in the PS/PCL blend thin films. Further more, it is found that the phase‐separation process and the wetting phenomenon of the blends on the glass substrate can be strongly suppressed after adding PS‐block‐PMMA diblock copolymer to the PS/PMMA blend system as a compatibilizer.Scheme of the longitudinal section of the evolution of the phase structure of a PS:PMMA (70:30 w:w) blend film.imageScheme of the longitudinal section of the evolution of the phase structure of a PS:PMMA (70:30 w:w) blend film.

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Section: Introductionmentioning

confidence: 99%

Inversion of Phase Morphology in Polymer‐Blend Thin Films on Glass Substrates

Xie

2004

Macro Chemistry & Physics

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“…Then the irregularly shaped fragments shrink and reshape into many anisotropic drops and droplets. The simulation reproduces the basic features of experimental observations 18–21…”

Section: Resultsmentioning

confidence: 54%

“…These authors examined laterally‐averaged composition profiles as a function of distance from the substrate surface. There have been many subsequent experiments on this problem 4–20. For example, Guenoun et al9 found that domain growth parallel to the surface was accelerated and, if a power law fit were attempted, showed a growth exponent of 1/2.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al13 investigated the interplay of phase separation, preferential wetting, and capillary instability in thin‐film polymer blends using composition‐profiling and surface‐imaging techniques. Recent interest has also focused on SDSD in other contexts, such as SDSD on patterned substrates,14,15 spinodal dewetting,16,17 and so on 18–23…”

Section: Introductionmentioning

confidence: 99%

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Diabetes research reported by nurses in Nordic countries

Graue

Iversen

Sigurðardóttir

et al. 2013

European Diabetes Nursing

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New knowledge from research studies is important as a foundation for high‐quality care in practice as well as crucial to further stimulate research in the future. The aims of this study were to determine the total number of peer‐reviewed articles on diabetes research reported by nurses in four Nordic countries (Denmark, Iceland, Norway and Sweden) from 1979–2009, and to identify the time periods in which they had been published, different study designs and the number of publications related to nurse authors. We performed an electronic search for potentially relevant scientific articles between 1 January 1979 and 31 December 2009 using the MEDLINE, Medline in process, EMBASE, CINAHL, PsycINFO and Cochrane databases. The studies focused either on the diabetes population or on diabetes health care professionals. We included 164 scientific articles; 132 resulting from electronic search and 32 from manual search. They were published in 63 different scientific journals, with 52 (32%) published in nursing journals and typically by authors with university degrees. Only one in four authors had published five or more articles. The majority of the studies originated from a single country, with 23 (14%) including co‐authors from another country. It was concluded that research in diabetes reported by nurses has increased considerably after the year 2000. Further action is needed to build stronger national groups of researchers. International collaborative research networks facilitate funding opportunities and contribute to further development of professional research competence. Copyright © 2013 FEND. Published by John Wiley & Sons, Ltd.

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The Morphology and Dynamics of Substrate Effects on Spinodal Decomposition in Binary Mixtures with Short‐Range Potential

Yan

Xie

2006

Macro Theory & Simulations

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Summary: The SDSD of binary mixture with short‐range potential is numerically simulated in 3D by cell dynamic system (CDSs), focusing on the phase morphology and dynamics in the parallel cross‐sections. The formation mechanism and growth law of the wetting layer are analyzed taking thermal noise effects into account. The simulated results show that the phase inversion in the parallel cross‐sections can be observed near the substrate interface. Without thermal noise, the growth law of the wetting layer is simply logarithmic. However, when the strength of thermal noise is large enough, the LS growth law can be found for a short‐range surface field. The results demonstrate that thermal noise can increase the extent of phase separation and lead to a transformation between partial and complete wetting for the substrate interface. The evolution of the phase in the parallel cross‐sections obeys the LS growth law and is self‐similar regardless of the effects of thermal noise.Simulated pattern evolution at different values of z at τ = 1 000 with G = 0.magnified imageSimulated pattern evolution at different values of z at τ = 1 000 with G = 0.

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Interface-Induced Coarsening Process in Polymer Blends

Cited by 7 publications

References 11 publications

Inversion of Phase Morphology in Polymer‐Blend Thin Films on Glass Substrates

Inversion of Phase Morphology in Polymer‐Blend Thin Films on Glass Substrates

Diabetes research reported by nurses in Nordic countries

The Morphology and Dynamics of Substrate Effects on Spinodal Decomposition in Binary Mixtures with Short‐Range Potential

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