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755 Aktuelle Fachpublikationen zum Thema temperature

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About the Interactions Controlling Nafion’s Viscoelastic Properties and Morphology

19.11.2015 | Jan-Patrick Melchior; Thomas Bräuniger; Andreas Wohlfarth; Giuseppe Portale; Klaus-Dieter Kreuer, Macromolecules, 2015

Interactions controlling the viscoelastic properties of Nafion are identified by investigating morphological changes induced through stretching at a wide range of controlled temperature and relative humidity. 2H-goniometer NMR exploiting the pseudonematic effect in D2O-containing membranes ...


Activation Thermodynamics and Concentration Scaling of the Viscosity of Unimeric and Aggregated Poloxamer EO93PO54EO93 in Water

19.11.2015 | François Quirion, Macromolecules, 2015

The viscosity of the aqueous solutions of Poloxamer EO93PO54EO93 (a triblock copolymer of ethylene oxide, EO, and propylene oxide, PO) was determined at concentrations ranging from 0.002 to 0.12 g·mL–1 at 0.9, 8.9, and 20.0 °C where only unimers are present, at 24.9 and 30.3 °C where the unimers ...


Determination of Concentration-Dependent Diffusion Coefficients in Polymer–Solvent Systems: Analysis of Concentration Profiles Measured by Raman Spectroscopy during Single Drying Experiments Excluding Boundary Conditions and Phase Equilibrium

17.11.2015 | David Siebel; Philip Scharfer; Wilhelm Schabel, Macromolecules, 2015

Diffusion coefficients in polymer solutions are strongly dependent on composition and temperature. In many cases sufficient data are not available due to time-consuming measurements and a high number of material systems of interest. In this work a new method is proposed that allows determination ...


Synthesis of Donor–Acceptor Polymers Containing Thiazolo[5,4-d]thiazole Units via Palladium-Catalyzed Direct Arylation Polymerization

12.11.2015 | Masayuki Wakioka; Satoru Ishiki; Fumiyuki Ozawa, Macromolecules, 2015

This paper reports the synthesis of alternating donor–acceptor copolymers (DA polymers) containing thiazole units via palladium-catalyzed direct arylation polymerization (DArP), which has recently emerged as a viable alternative to conventional cross-coupling polycondensations. While ...


Clustering of High Molecular Weight PCDTBT in Bulk-Heterojunction Casting Solutions

12.11.2015 | Andrew J. Clulow; Elliot P. Gilbert; Pascal Wolfer; Paul L. Burn; Ian R. Gentle, Macromolecules, 2015

The narrow optical gap conjugated polymer poly[N-9″-heptadecanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) has been used as the electron donor material in efficient solution-processed bulk-heterojunction (BHJ) photovoltaic and photodetector devices when ...


Influence of Primary Structure on Responsiveness. Oxidative, Thermal, and Thermo-Oxidative Responses in Polysulfides

10.11.2015 | Richard d’Arcy; Alessandro Siani; Enrique Lallana; Nicola Tirelli, Macromolecules, 2015

Using polymers with a double stimulus responsiveness, we show that primary structure, in addition to chemical composition, can significantly influence the response. This, however, applies to a stimulus of supramolecular nature (temperature) and not to a molecular one (oxidation). In the anionic ...


Microstructure and Self-Assembly of Supramolecular Polymers Center-Functionalized with Strong Stickers

06.11.2015 | Cyril Véchambre; Xavier Callies; Cécile Fonteneau; Guylaine Ducouret; Sandrine Pensec; Laurent Bouteiller; Costantin ..., Macromolecules, 2015

This manuscript describes the microstructure of a series of nearly monodisperse poly(n-butyl) acrylate (PnBA) chains center-functionalized with a triurea interacting moiety, able to self-associate by six hydrogen bonds. Different molecular weights have been investigated, from 5000 g·mol–1 up to ...


Thermally Reversible Distortion Observed for Triblock Copolymers Comprising Main-Chain Liquid Crystal Polyesters Attached to Photo-Cross-Linked Cinnamate Segments at Both Ends

05.11.2015 | Kohei Abe; Maito Koga; Takumi Wakabayashi; Sungmin Kang; Koichi Sakajiri; Junji Watanabe; Masatoshi Tokita, Macromolecules, 2015

ABA triblock B5 Cin copolymers were prepared by attaching photoreactive poly(2-cinnamoyloxyethyl methacrylate) (PCEMA) segments to both ends of main-chain smectic BB-5(3-Me) polyesters. The copolymers with PCEMA volume fraction (φ) ranging from 23% to 50% formed lamellar microdomains, and the ...


Application of Tammann’s Two-Stage Crystal Nuclei Development Method for Analysis of the Thermal Stability of Homogeneous Crystal Nuclei of Poly(ethylene terephthalate)

04.11.2015 | René Androsch; Christoph Schick; Alicyn Marie Rhoades, Macromolecules, 2015

Tammann’s two-stage crystal nuclei development method has been applied to gain information about the kinetics of formation and the stability of homogeneous crystal nuclei in poly(ethylene terephthalate). The method requires rapid cooling of the relaxed melt to different nucleation temperatures ...


Dynamic Heterogeneity and Cooperative Length Scale at Dynamic Glass Transition in Glass Forming Liquids

03.11.2015 | Bidur Rijal; Laurent Delbreilh; Allisson Saiter, Macromolecules, 2015

Understanding the evolution of the cooperative molecular mobility as a function of time and temperature remains an unsolved question in condensed matter research. However, recently great advances have been made within the framework of the Adam–Gibbs theory on the connection between cooperatively ...


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