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636 Aktuelle Fachpublikationen zum Thema temperature

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Amorphous Phase Modulus and Micro–Macro Scale Relationship in Polyethylene via in Situ SAXS and WAXS

19.03.2015 | Bijin Xiong; Olivier Lame; Jean-Marc Chenal; Cyrille Rochas; Roland Seguela; Gerard Vigier, Macromolecules, 2015

The small strain mechanical behavior of bulk polyethylene was investigated at the local scale of the lamella stackings by means of combined in situ SAXS and WAXS at different testing temperatures. Three different thermal treatments on four materials afforded studying a wide range of ...


End Block Design Modulates the Assembly and Mechanics of Thermoresponsive, Dual-Associative Protein Hydrogels

13.03.2015 | Matthew J. Glassman; Bradley D. Olsen, Macromolecules, 2015

Polymers exhibiting lower critical solution behavior in water have found broad use as thermoresponsive moieties in soft materials, particularly in biomedical applications for triggered actuation, gelation, accumulation, or release. In this work, changing the thermoresponsive block in a ...


Dynamical Theory of Segmental Relaxation and Emergent Elasticity in Supercooled Polymer Melts

13.03.2015 | Stephen Mirigian; Kenneth S. Schweizer, Macromolecules, 2015

We generalize the force-level Elastically Collective Nonlinear Langevin Equation theory of supercooled molecular liquid dynamics to polymer melts based on mapping chains to disconnected and noninterpenetrating Kuhn-sized spheres. This allows first-principles, no adjustable parameter calculations ...


Micelle Structure of Novel Diblock Polyethers in Water and Two Protic Ionic Liquids (EAN and PAN)

12.03.2015 | Zhengfei Chen; Paul A. FitzGerald; Yumi Kobayashi; Kazuhide Ueno; Masayoshi Watanabe; Gregory G. Warr; Rob Atkin, Macromolecules, 2015

Small angle neutron scattering has been used to probe the self-assembled structures formed by novel block copolymers in water and two protic ionic liquids (ILs), ethylammonium nitrate (EAN) and propylammonium nitrate (PAN). The block copolymers consist of solvophilic poly(ethylene oxide) (PEO) ...


1,4-Selective Polymerization of 1,3-Cyclohexadiene and Copolymerization with Styrene by Cationic Half-Sandwich Fluorenyl Rare Earth Metal Alkyl Catalysts

11.03.2015 | Gaixia Du; Yingyun Long; Jiaping Xue; Shaowen Zhang; Yuping Dong; Xiaofang Li, Macromolecules, 2015

The regioselective coordination–insertion polymerization of 1,3-cyclohexadiene (CHD) and copolymerization with styrene (S) could be achieved by cationic half-sandwich fluorenyl rare earth metal alkyl catalysts generated by treating half-sandwich fluorenyl rare earth metal dialkyl complexes ...


Enhanced Polystyrene Surface Mobility under Carbon Dioxide at Low Temperature for Nanoparticle Embedding Control

09.03.2015 | Qiuyan Yang; Qun Xu; Katja Loos, Macromolecules, 2015

The surface properties of polystyrene (PS) films under carbon dioxide (CO2) were studied via a particle embedding technique at quite a low temperature range (308–323 K) in which polystyrene is typically considered to be in a glassy state without CO2. The atomic force microscope (AFM) technique ...


Macromolecular Design via an Organocatalytic, Monomer-Specific and Temperature-Dependent “On/Off Switch”. High Precision Synthesis of Polyester/Polycarbonate Multiblock Copolymers

06.03.2015 | Peter Olsén; Karin Odelius; Helmut Keul; Ann-Christine Albertsson, Macromolecules, 2015

The employment of a monomer-specific “on/off switch” was used to synthesize a nine-block copolymer with a predetermined molecular weight and narrow distribution (Đ = 1.26) in only 2.5 h. The monomers consisted of a six-membered cyclic carbonate (i.e., 2-allyloxymethyl-2-ethyl-trimethylene ...


Dramatic Behavioral Differences of the Copolymerization Reactions of 1,4-Cyclohexadiene and 1,3-Cyclohexadiene Oxides with Carbon Dioxide

05.03.2015 | Donald J. Darensbourg; Wan-Chun Chung; Andrew D. Yeung; Mireya Luna, Macromolecules, 2015

The copolymerization of 1,3-cyclohexadiene oxide (1,2-epoxy-3-cyclohexene) with CO2 in the presence of the binary catalyst (salen)CoX or (salen)CrX and onium salts was shown to selectively afford the completely alternating copolymer poly(1,3-cyclohexadiene carbonate) in good yield. In the process ...


Crystallization of Poly(2-isopropyl-2-oxazoline) in Organic Solutions

03.03.2015 | Natalia Oleszko; Alicja Utrata-Wesołek; Wojciech Wałach; Marcin Libera; Anna Hercog; Urszula Szeluga; Marian Domańsk ..., Macromolecules, 2015

The crystallization of polymers from organic solvents is a common phenomenon. Poly(2-isopropyl-2-oxazoline) (PIPOx) is known to crystallize in aqueous or aqueous/organic solvent solutions. This process is associated with the dehydration of polymer chains above the polymer’s lower critical ...


BCC Grain Formation Triggered by Miscibility Jump on Temperature Drop

02.03.2015 | Akifumi Matsushita; Shigeru Okamoto; Eiko Tamura; Tadashi Inoue, Macromolecules, 2015

Formation of a body-centered cubic (BCC) structure and grain growth process triggered by segregation-power jump on a temperature drop was studied by small-angle X-ray scattering (SAXS), rheology, and differential scanning calorimetry (DSC). Polystyrene-block-poly(ethylene-alt-propylene) (SEP) was ...


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