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718 Aktuelle Fachpublikationen zum Thema temperature

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Thermally Reversible Ion Gels with Photohealing Properties Based on Triblock Copolymer Self-Assembly

17.08.2015 | Takeshi Ueki; Ryoji Usui; Yuzo Kitazawa; Timothy P. Lodge; Masayoshi Watanabe, Macromolecules, 2015

We describe a functional soft material that can spontaneously repair damage by straightforward application of light illumination. The composite material is composed of a common ionic liquid (IL), 1-butyl-3-methylimidazolium hexafluorophosphate ([C4mim]PF6), and a well-defined ABA triblock ...

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Self-Healing of a Cross-Linked Polymer with Dynamic Covalent Linkages at Mild Temperature and Evaluation at Macroscopic and Molecular Levels

13.08.2015 | Keiichi Imato; Atsushi Takahara; Hideyuki Otsuka, Macromolecules, 2015

A lot of self-healing materials using dynamic bonding systems have been reported, while the focus is mainly on the macroscopic self-healing behavior such as visually recognizable healing. Because the healing originates from microscopic chemical reactions of the dynamic bonds, evaluation of the ...

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Thermoswitchable Nanoparticles Based on Elastin-like Polypeptides

13.08.2015 | Bettina Kracke; James T. Cole; Christoph J. O. Kaiser; Björn Hellenkamp; Stefanie Krysiak; Ali Ghoorchian; Gary B. B ..., Macromolecules, 2015

The design of biocompatible particles with defined size on the nanometer scale has proven to be a challenging task in current biomedical research. Here we present an approach toward temperature-responsive nanoparticles by covalently cross-linking micelles based on trimeric constructs of ...

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Cavitation in Isotactic Polypropylene at Large Strains during Tensile Deformation at Elevated Temperatures

13.08.2015 | Ying Lu; Yaotao Wang; Ran Chen; Jiayi Zhao; Zhiyong Jiang; Yongfeng Men, Macromolecules, 2015

Two quenched isotactic polypropylene samples with different molecular weight were used to explore the sudden stress whitening activated at large strains during stretching at elevated temperatures via the ultrasmall-angle X-ray scattering technique. This kind of whitening was confirmed to be ...

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Influence of the Main-Chain Configuration on the Mechanical Properties of Linear Aliphatic Polyesters

13.08.2015 | Mark P. F. Pepels; Leon E. Govaert; Rob Duchateau, Macromolecules, 2015

Linear aliphatic polyesters have been investigated extensively over the last decades. However, the relation between the configuration of the ester groups in the main chain and the mechanical properties is only poorly understood. Therefore, in this work the influence of the composition of these ...

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Flow and Pressure Jointly Induced Ultrahigh Melting Temperature Spherulites with Oriented Thick Lamellae in Isotactic Polypropylene

12.08.2015 | Shu-Gui Yang; Zhengchi Zhang; Dong Zhou; Yan Wang; Jun Lei; Liangbin Li; Zhong-Ming Li, Macromolecules, 2015

In practical processing, polymer melts generally experience flow and pressure fields simultaneously, but their flow-induced crystallization behavior under pressure was barely investigated. For this reason, we provided an insight into the crystallization behavior and crystalline morphology and ...

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Structure of Two-Compartment Hydrogels from Thermoresponsive ABC Triblock Terpolymers

07.08.2015 | Can Zhou; Gilman E. S. Toombes; Matthew J. Wasbrough; Marc A. Hillmyer; Timothy P. Lodge, Macromolecules, 2015

Aqueous dispersions of a poly(ethylene-alt-propylene)-b-poly(ethylene oxide)-b-poly(N-isopropylacrylamide) (PON) triblock terpolymer with block molecular weights of 3 000–25 000–10 000 and polymer concentrations ranging from 1 to 5 wt % were investigated at several temperatures from 25 to 55 °C ...

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An Investigation of the Pathways for Oxygen/Sulfur Scramblings during the Copolymerization of Carbon Disulfide and Oxetane

07.08.2015 | Ming Luo; Xing-Hong Zhang; Donald J. Darensbourg, Macromolecules, 2015

The catalytic coupling of oxetane, the symmetric isomer of propylene oxide, with carbon disulfide has been investigated utilizing (salen)CrCl in the presence of various onium salts. Oxygen and sulfur atom exchange was observed in both the polymeric and cyclic carbonate products. The coupling of ...

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Polyethylene as a Cosolvent and Catalyst Support in Ring-Opening Metathesis Polymerization

06.08.2015 | Jakkrit Suriboot; Christopher E. Hobbs; William Guzman; Hassan S. Bazzi; David E. Bergbreiter, Macromolecules, 2015

Polyethylene oligomers (PEOlig) can be used as cosolvents and sometimes soluble catalyst supports in ring-opening metathesis polymerization (ROMP) reactions. As a catalyst support, this polyolefin serves as an N-heterocyclic carbene ligand for a ROMP catalyst, making it soluble at 70 °C and ...

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Chemical Vapor Jet Deposition of Parylene Polymer Films in Air

06.08.2015 | Shaurjo Biswas; Olga Shalev; Kevin P. Pipe; Max Shtein, Macromolecules, 2015

Parylene films are commonly used as transparent, flexible coatings in electronic devices and biomedical applications, exhibiting barrier properties against corrosion, low dielectric constant, and moisture resistance. Reactive vapor deposition of parylene results in conformal coverage of features ...

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