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567 Aktuelle Fachpublikationen zum Thema temperature

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Study of the Dynamic Heterogeneity in Poly(ethylene-ran-vinyl acetate) Copolymer by Using Broadband Dielectric Spectroscopy and Electrostatic Force Microscopy

13.09.2013 | Mohammed M. Kummali; Angel Alegría; Luis A. Miccio; Juan Colmenero, Macromolecules, 2013

Dynamic heterogeneities in ethylene–vinyl acetate (EVA) random copolymers were studied using broadband dielectric spectroscopy (BDS) over a broad frequency and temperature range. BDS data for EVA copolymers show relatively broad spectra extending over several frequency decades, which make ...

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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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Novel High Molecular Weight Aromatic Fluorinated Polymers from One-Pot, Metal-Free Step Polymerizations

12.09.2013 | Lilian I. Olvera; Maria T. Guzmán-Gutiérrez; Mikhail G. Zolotukhin; Sergei Fomine; Jorge Cárdenas; Fransico A. Ruiz- ..., Macromolecules, 2013

A novel series of linear, high-molecular-weight polymers and copolymers was synthesized by one-pot, metal-free superacid-catalyzed reaction of trifluoromethylalkyl (1a–1c) and trifluoromethylaryl (1d–1h) ketones with the linear, nonactivated, multiring aromatic hydrocarbons biphenyl (A), ...

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RAFT Synthesis and Aqueous Solution Behavior of Novel pH- and Thermo-Responsive (Co)Polymers Derived from Reactive Poly(2-vinyl-4,4-dimethylazlactone) Scaffolds

12.09.2013 | Jing Yang Quek; Yicheng Zhu; Peter J. Roth; Thomas P. Davis; Andrew B. Lowe, Macromolecules, 2013

Well-defined homopolymers of 2-vinyl-4,4-dimethylazlactone (VDA) and AB diblock copolymers of VDA with N,N-dimethylacrylamide (DMA) and N-isopropylacrylamide (NIPAM) prepared by reversible addition–fragmentation chain transfer (RAFT) radical polymerization are reported. VDA homopolymers reacted ...

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Critical Phenomenon During Drying of Semiaromatic, Transparent and Soluble Polyimide Cast Films: Real-Time Observation of Birefringence and Other Integrated Parameters

10.09.2013 | Yuji Eguchi; Emre Unsal; Miko Cakmak, Macromolecules, 2013

A newly developed real-time multifunctional monitoring system was used to track in-plane and out-of-plane birefringence, weight, thickness and surface temperature of semiaromatic, transparent, and soluble polyimide cast films during drying. At a critical point during drying, out-of-plane ...

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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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Synthesis, Characterization, and Solubility in Supercritical Carbon Dioxide of Hyperbranched Copolyesters

09.09.2013 | Jacek Gregorowicz; Edyta P. Wawrzyńska; Paweł G. Parzuchowski; Zbigniew Fraś; Gabriel Rokicki; Kamil Wojciechowski; ..., Macromolecules, 2013

Hyperbranched polymers (HBPs) have been known and extensively investigated for over two decades. However, there are still areas that need to be explored. Recently, much effort has been placed in developing drug delivery systems based on macromolecules of three-dimensional structure. This paper ...

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Anionic Polymerization of 2-Phenyl[3]dendralene and 2-(4-Methoxyphenyl)[3]dendralene

06.09.2013 | Katsuhiko Takenaka; Shuhei Amamoto; Hiroto Kishi; Hiroki Takeshita; Masamitsu Miya; Tomoo Shiomi, Macromolecules, 2013

Anionic polymerization of two phenyl-substituted trienes containing cross-conjugated carbon–carbon double bonds, 2-phenyl[3]dendralene (P3D) and 2-(4-methoxyphenyl)[3]dendralene (MP3D), was carried out in THF under a variety of different conditions. Poly(P3D) of controlled molecular weight with a ...

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Phase Transitions of Polystyrene-b-poly(dimethylsiloxane) in Solvents of Varying Selectivity

06.09.2013 | Ting-Ya Lo; Chia-Cheng Chao; Rong-Ming Ho; Prokopios Georgopanos; Apostolos Avgeropoulos; Edwin L. Thomas, Macromolecules, 2013

A simple method to create a variety of nanostructures via the self-assembly of a single composition silicon-containing block copolymer (BCP) is developed. By using selective solvents for the self-assembly of polystyrene-block-poly(dimethylsiloxane) (PS–PDMS), the phase behavior of intrinsic BCP ...

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Direct Formation of Isotactic Poly(1-butene) Form I Crystal from Memorized Ordered Melt

05.09.2013 | Fengmei Su; Xiangyang Li; Weiming Zhou; Shanshan Zhu; Youxin Ji; Zhen Wang; Zeming Qi; Liangbin Li, Macromolecules, 2013

Crystallization from memorized ordered melt (MOM) of isotactic polybutene-1 (iPB-1) is investigated with in situ Fourier transformation infrared microspectroscopic imaging and wide- and small-angle X-ray scattering. After being partially melted at high temperature, a small portion of form I ...

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