Control of Phase Morphology of Binary Polymer Grafted Nanoparticle Blend Films via Direct Immersion Annealing

The size dependent miscibility of binary polymer blend films of polystyrene (PS) and tetramethylbisphenol-A polycarbonate (TMPC) is studied by the molecular dynamics (MD) simulation in the way of computing Flory-Huggins interaction parameter, χ, of the blend films, which determines the blend films compatibility. It is found that the miscibility of the two polymers decreases as the film thickness D decreases. After that, the size dependent glass transition temperature Tg(w,D) of the two polymers blend films in miscible ranges are determined by computer simulation and the Fox equation where w is the weight fraction of the second component.

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Spatially controlled CdSe nanocrystal distribution in phase separated polymer blend films

MRS Proceedings ◽

10.1557/proc-636-d9.52.1 ◽

2000 ◽

Vol 636 ◽

Author(s):

Harumi Asami ◽

Soichiro Saita ◽

Itaru Kamiya ◽

Kenichi Yoshie

Keyword(s):

Spin Coating ◽

Driving Force ◽

Cdse Nanocrystals ◽

Polymer Phase ◽

Rich Phase ◽

Blend Films ◽

Rich Domain ◽

Binary Polymer ◽

Fabrication And Characterization

AbstractWe report the fabrication and characterization of the self-assembled structure of tri-n-octylphosphine oxide (TOPO)-capped CdSe nanocrystals in binary polymer phase separated films of polystyrene (PS), poly(methyl methacrylate) (PMMA) and poly(2-vinylpyridine) (P2VP). These structures are formed via demixing of CdSe nanocrystals and binary polymer during spin coating. The nanocrystals preferentially segregate to the PS-rich phase in phase separated PS/PMMA and to the P2VP-rich phase in phase separated PS/P2VP, as shown by optical microscopy and photoluminescence images. For CdSe/PS/PMMA, we attribute the driving force for CdSe segregating to the PS-rich domain to the stronger attractive interaction of TOPO on PS with respect to PMMA due to polarity, and in the case of CdSe/PS/P2VP, segregating to the P2VP-rich domain to the interaction such as coordinate bonds being formed between pyridine groups and surface Cd atoms.

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Molecular weight effects on the phase morphology of PS/P4VP blend films on homogeneous SAM and heterogeneous SAM/Au substrates

Polymer ◽

10.1016/j.polymer.2003.12.075 ◽

2004 ◽

Vol 45 (5) ◽

pp. 1637-1646 ◽

Cited By ~ 24

Author(s):

Xue Li ◽

Rubo Xing ◽

Ying Zhang ◽

Yanchun Han ◽

Lijia An

Keyword(s):

Molecular Weight ◽

Phase Morphology ◽

Blend Films

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Temperature Dependence of Single Chain Properties in a Binary Polymer Blend

Journal de Physique II ◽

10.1051/jp2:1996173 ◽

1996 ◽

Vol 6 (2) ◽

pp. 187-194 ◽

Cited By ~ 11

Author(s):

M. Müller ◽

K. Binder

Keyword(s):

Temperature Dependence ◽

Polymer Blend ◽

Single Chain ◽

Binary Polymer

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Preservation of Morphological Integrity and Clot Retraction Activity of Human Platelets After Freezing

Thrombosis and Haemostasis ◽

10.1055/s-0038-1654822 ◽

1964 ◽

Vol 11 (01) ◽

pp. 222-229 ◽

Cited By ~ 8

Author(s):

Isaac Djerassi ◽

Albert Roy ◽

Jorge Alvarado ◽

Keyword(s):

Dimethyl Sulfoxide ◽

Liquid Nitrogen ◽

Human Platelets ◽

Slow Freezing ◽

Critical Conditions ◽

Plasma Medium ◽

Clot Retraction ◽

Controlled Freezing ◽

Direct Immersion

SummaryHuman platelets frozen at −195° C (liquid nitrogen) retain their morphological integrity and ability to promote clot retraction when 5% dimethyl-sulfoxide and 5% dextrose are added to the suspending plasma medium. Slow freezing was more effective than direct immersion in the liquid nitrogen. Although similar results may be achieved with dimethylsulfoxide alone with rigidly controlled freezing rates, the addition of sugars may permit freezing under less critical conditions.Dimethylsulfoxyd und 5% Dextrose dem Plasmamilieu hinzugefügt werden. Das langsame Einfrieren ist effektiver als das direkte Eintauchen in flüssigen Stickstoff. Obschon ähnliche Resultate mit Dimethylsulfoxyd allein unter exakter Kontrolle der Einfrierungsgeschwindig-keit erreicht werden können, erlaubt die Zugabe von Dextrose ein Einfrieren unter weniger kritischen Bedingungen.

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