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1.889 Aktuelle Fachpublikationen zum Thema temperature

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Dynamic Heterogeneity and Phase Separation Kinetics in Miscible Poly(vinyl acetate)/Poly(ethylene oxide) Blends by Local Dielectric Spectroscopy

12.09.2013 | Tomas P. Corrales; David Laroze; George Zardalidis; George Floudas; Hans-Jürgen Butt; Michael Kappl, Macromolecules, 2013

Local dielectric spectroscopy (LDS) was employed to analyze the miscible blend composed of poly(vinyl acetate) (PVAc) and poly(ethylene oxide) (PEO). The two homopolymers have very different relaxation times and glass transition temperatures. The aim was to study the dynamic heterogeneity in ...

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Phase and Glass Transitions Observed by Adiabatic Calorimetry of Host p-tert-Butylcalix[4]arene and Guest Toluene Inclusion Crystal, Suggesting the Progress of the Combined Order–Disorder Process of the Host–Guest Molecules

12.09.2013 | Kouhei Ueda; Masaharu Oguni, Journal of Physical Chemistry B, 2013

Heat capacities of crystalline p-tert-butylcalix[4]arene·toluene host–guest compound were measured in a temperature range between 3 K and 345 K by adiabatic calorimetry. The crystal showed one second-order phase transition at 256.4 K accompanied by wide heat-capacity tails on both the high and ...

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Determination of Thermal Transition Depth Profiles in Polymer Semiconductor Films with Ellipsometry

09.09.2013 | Christian Müller; L. Mattias Andersson; Ovidio Peña-Rodríguez; Miquel Garriga; Olle Inganäs; Mariano Campoy-Quiles, Macromolecules, 2013

Geometric confinement and interface effects can significantly alter the thermodynamic properties of thin polymer films. Phase transition temperatures have been shown to strongly depend on film thickness below a critical thickness threshold. It has been suggested that this behavior is due to an ...

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Materials, Vol. 6, Pages 3963-3977: Microstructural and Wear Behavior Characterization of Porous Layers Produced by Pulsed Laser Irradiation in Glass-Ceramics Substrates

09.09.2013 | Sola, Daniel ; Conde, Ana ; García, Iñaki ; Gracia-Escosa, Elena ; Damborenea, Juan J. de; Peña, Jose I., Materials, 2013

In this work, wear behavior and microstructural characterization of porous layers produced in glass-ceramic substrates by pulsed laser irradiation in the nanosecond range are studied under unidirectional sliding conditions against AISI316 and corundum counterbodies. Depending on the optical ...

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ChemInform Abstract: Cubic and Hexagonal NaGdF4 Crystals Precipitated from an Aluminosilicate Glass: Preparation and Luminescence Properties.

05.09.2013 | Andreas Herrmann, Maxi Tylkowski, Christian Bocker, Christian Ruessel, ChemInform, 2013

Abstract Thermal annealing of silicate glasses in the system SiO2/Al2O3/AlF3/Na2 O/Gd2O3/SmF3 leads to precipitation of cubic or hexagonal Sm3+‐doped NaGdF4 nanocrystals depending on the composition of the glass and the annealing temperature.

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Self-Organization of Zr(IV) Porphyrinoids on Graphene Oxide Surfaces by Axial Metal Coordination

05.09.2013 | Matthew Jurow; Viacheslav Manichev; Cesar Pabon; Brian Hageman; Yuliya Matolina; Charles Michael Drain, Inorganic Chemistry, 2013

The protruding oxophilic central metal ion of ZrIV porphyrinoids facilitates axial coordination to the oxygen bearing functional groups on graphene oxide (GO) surfaces to result in new supramolecular photonic materials with high dye loading especially on edges and large defects. The reaction ...

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Influence of Dangling Chains on Molecular Dynamics of Polyurethanes

03.09.2013 | Wenwen Yu; Miao Du; Dezhi Zhang; Yu Lin; Qiang Zheng, Macromolecules, 2013

The effect of dangling chains on phase-separated microstructure and molecular dynamics for polyurethanes (PUs) was investigated. PUs with different dangling chain lengths and polar groups were prepared through changing the types of diol extender. The molecular dynamics was studied by a ...

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Living cationic polymerization of vinylnaphthalene derivatives

02.09.2013 | Yu Shinke, Arihiro Kanazawa, Shokyoku Kanaoka, Sadahito Aoshima, Journal of Polymer Science Part A: Polymer Chemistry, 2013

ABSTRACT The living cationic polymerization of 6‐tert‐butoxy‐2‐vinylnaphthalene (tBOVN), a vinylnaphthalene derivative with an electron‐donating group, was achieved with a TiCl4/SnCl4 combined initiating system in the presence of ethyl acetate as an added base at –30 °C. The absence of side ...

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Synthesis, characterization and morphological studies of some novel siloxane-based block copolymeric materials containing organometallic as well as organic polyesteramides

02.09.2013 | Author(s): Muhammad Saif Ullah Khan , Zareen Akhter , Naseer Iqbal , Mohammad Siddiq, Journal of Organometallic Chemistry, 2013

Publication date: 15 November 2013 Source:Journal of Organometallic Chemistry, Volumes 745–746 Author(s): Muhammad Saif Ullah Khan , Zareen Akhter , Naseer Iqbal , Mohammad Siddiq A series of semi-aromatic diamine monomers (1,m-bis (4-amino benzoyloxy) alkanes; m=2–6) having in-built ...

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A reaction order functional relationship with the Williams–Landel–Ferry equation in curing kinetics

29.08.2013 | F. López‐Serrano, J.E. Puig, E. Mendizábal, Polymer Engineering and Science, 2013

A methodology is presented to obtain a kinetic model for curing reactions, from conversion against time and the glass‐transition temperature versus conversion data. Isothermal runs for a cyanate ester resin from 140 to 190°C, reported previously, were evaluated. The approach utilizes the ...

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