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693 Aktuelle Fachpublikationen zum Thema temperature

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Multiscale Lithium and Counterion Transport in an Electrospun Polymer-Gel Electrolyte

26.06.2015 | Bryce E. Kidd; Scott J. Forbey; Friedrich W. Steuber; Robert B. Moore; Louis A. Madsen, Macromolecules, 2015

We explore fundamental lithium ion (Li+) and triflate counterion (CF3SO3–) transport properties within an electrospun UV-cross-linked poly(ethylene oxide) polymer-gel electrolyte. With modulation of cross-linker (10–30 wt %), the fully swollen fibrous framework swells and retains between 1700 and ...

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Dynamic Molecular Behavior on Thermoresponsive Polymer Brushes

25.06.2015 | Huai-Ying Chin; Dapeng Wang; Daniel K. Schwartz, Macromolecules, 2015

The surface dynamics of individual surfactant and polymer molecules on thermally responsive polymer brushes (poly(N-isopropylacrylamide), PNIPAAM) were studied using high throughput single molecule tracking microscopy. The probe molecules universally exhibited intermittent hopping motion, in ...

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Crystallization and Mechanical Properties of Poly(l-lactide)-Based Rubbery/Semicrystalline Multiblock Copolymers

22.06.2015 | Tessie R. Panthani; Frank S. Bates, Macromolecules, 2015

The crystallization and mechanical properties of triblock and multiblock copolymers containing 70 vol % semicrystalline poly(l-lactide) (L) and 30 vol % rubbery poly(ethylene-co-ethylene) (E/EE) were investigated. The multiblock copolymer was synthesized directly from the triblock copolymer ...

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Strain-Induced Crystallization during Relaxation Following Biaxial Stretching of PET Films: A Real-Time Mechano-Optical Study

22.06.2015 | Mohamed K. Hassan; Mukerrem Cakmak, Macromolecules, 2015

The relaxation behavior of simultaneously and sequentially biaxially stretched PET films was studied at the rubbery state stretching temperatures. The primary objective was to investigate the influence of process conditions and the mode of deformation on the structural changes that take place in ...

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Determination of the Lamellae-to-Disorder Heat of Transition in a Short Diblock Copolymer by Relaxation Calorimetry

22.06.2015 | Timothy M. Gillard; Daniel Phelan; Chris Leighton; Frank S. Bates, Macromolecules, 2015

Relaxation calorimetry experiments were used to measure the temperature dependence of the heat capacity near the order–disorder phase transition (ODT) in a low molecular weight volumetrically symmetric, lamellae-forming, poly(1,4-isoprene-b-dl-lactide) diblock copolymer with Mn = 2750 g/mol ...

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Temperature Driven Self-Assembly of a Zwitterionic Block Copolymer That Exhibits Triple Thermoresponsivity and pH Sensitivity

16.06.2015 | Zulma A. Jiménez; Ryo Yoshida, Macromolecules, 2015

We report a zwitterionic block copolymer composed of N-isopropylacrylamide and N,N-dimethyl-N-(3-(methacrylamido)propyl)ammoniopropanesulfonate monomers which self-assembles into different structures depending on the solution temperature. As the temperature is increased from 20 to 70 °C, the ...

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Mechanical and Structural Characterization of Semicrystalline Polyethylene under Tensile Deformation by Molecular Dynamics Simulations

15.06.2015 | In-Chul Yeh; Jan W. Andzelm; Gregory C. Rutledge, Macromolecules, 2015

We have studied tensile deformations of semicrystalline polyethylene (PE) with molecular dynamics simulations at two different strain rates and temperatures. Compared to earlier studies, the modeled systems were approximately 5 times larger, which allowed significantly larger strains up to about ...

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Structural Models of Poly(cyclopentadithiophene-alt-benzothiadiazole) with Branched Side Chains: Impact of a Single Fluorine Atom on the Crystal Structure and Polymorphism of a Conjugated Polymer

12.06.2015 | Florian S. U. Fischer; Navaphun Kayunkid; Daniel Trefz; Sabine Ludwigs; Martin Brinkmann, Macromolecules, 2015

This study describes the impact of a single fluorine atom substitution in the conjugated backbone of poly(cyclopentadithiophene-alt-benzothiadiazole) on the structure and the polymorphism of the polymer bearing 2-ethylhexyl side chains. Controlled growth of the nonfluorinated and fluorinated ...

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A Library of Thermoresponsive, Coacervate-Forming Biodegradable Polyesters

12.06.2015 | John P. Swanson; Leanna R. Monteleone; Fadi Haso; Philip J. Costanzo; Tianbo Liu; Abraham Joy, Macromolecules, 2015

We report on a new class of thermoresponsive biodegradable polyesters (TR-PE) inspired by polyacrylamides and elastin-like proteins (ELPs). The polyesters display reversible phase transition with tunable cloud point temperatures (Tcp) in aqueous solution as evidenced by UV–vis spectroscopy, 1H ...

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1,4-Polybutadienes with Pendant Hydroxyl Functionalities by ROMP: Synthetic and Mechanistic Insights

11.06.2015 | Flavien Leroux; Sagrario Pascual; Véronique Montembault; Laurent Fontaine, Macromolecules, 2015

The reactivity of cis-3,4-bis(hydroxymethyl)cyclobutene derivatives bearing free and protected hydroxyl groups during ring-opening metathesis polymerization (ROMP) was investigated using ruthenium-based initiators. It was found that the ROMP of cis-4-benzyloxymethyl-3-hydroxymethylcyclobutene (1) ...

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