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590 Aktuelle Fachpublikationen zum Thema temperature

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Radical Dendrimers: A Family of Five Generations of Phosphorus Dendrimers Functionalized with TEMPO Radicals

13.11.2014 | Elena Badetti; Vega Lloveras; Jose Luis Muñoz-Gómez; Rosa Marı́a Sebastián; Anne Marie Caminade; Jean Pierre Majoral ..., Macromolecules, 2014

Five novel generations of phosphorus dendrimers based on a cyclotriphosphazene core with stable TEMPO radicals end groups have been synthesized and studied by EPR, SQUID, 1H NMR, 31P NMR, FT-IR, and UV–vis spectroscopy. The nitroxyl radicals exhibit a strong exchange interaction, which depends on ...

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Synthesis of Thermal Degradable Poly(alkoxyamine) through a Novel Nitroxide Radical Coupling Step Growth Polymerization Mechanism

12.11.2014 | Xuepu Wang; Jian Huang; Lingdi Chen; Yujie Liu; Guowei Wang, Macromolecules, 2014

The thermal degradable poly(alkoxyamine) was synthesized through a novel nitroxide radical coupling step growth polymerization (NRC-SGP) mechanism. The monomers of 1,4-phenylene bis(2-bromo-2-methylpropanoate) (monomer 1) and 1,4-phenylene bis(2-bromopropanoate) (monomer 1′) with two bromide ...

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Rheological Study of Order-to-Disorder Transitions and Phase Behavior of Block Copolymer–Surfactant Complexes Containing Hydrogen-Bonded Small Molecule Additives

12.11.2014 | Rohit Kothari; H. Henning Winter; James J. Watkins, Macromolecules, 2014

Dynamic mechanical measurements were used to investigate the effect of small molecule additives on the order-to-disorder transitions (ODTs) of Pluronic, poly(ethylene oxide) (PEO)–poly(propylene oxide) (PPO)–PEO triblock copolymer surfactant melts. The small molecule additives contain multiple ...

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Interplay between a Strong Memory Effect of Crystallization and Liquid–Liquid Phase Separation in Melts of Broadly Distributed Ethylene–1-Alkene Copolymers

11.11.2014 | Al Mamun; Xuejian Chen; Rufina G. Alamo, Macromolecules, 2014

Narrow metallocene-made random ethylene copolymers display a strong memory effect of crystallization above their equilibrium melting point akin to the melt memory effect observed in model ethylene–1-butene copolymers. The onset temperature for self-nucleation or surviving self-seeds displays a ...

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Effect of Isomerism on Molecular Packing and Gas Transport Properties of Poly(benzoxazole-co-imide)s

11.11.2014 | Yongbing Zhuang; Jong Geun Seong; Yu Seong Do; Hye Jin Jo; Moon Joo Lee; Gang Wang; Michael D. Guiver; Young Moo Lee, Macromolecules, 2014

A facile approach to synthesize poly(benzoxazole-co-imide)s without thermal rearrangement at high temperature is proposed. Poly(benzoxazole-co-imide)s with improved mechanical and solution-processable properties were prepared through polycondensation of 4,4′-(hexafluoroisopropylidene) diphthalic ...

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Versatile 2-Methoxyethylaminobis(phenolate)yttrium Catalysts: Catalytic Precision Polymerization of Polar Monomers via Rare Earth Metal-Mediated Group Transfer Polymerization

10.11.2014 | Peter T. Altenbuchner; Benedikt S. Soller; Stefan Kissling; Thomas Bachmann; Alexander Kronast; Sergei I. Vagin; Ber ..., Macromolecules, 2014

The present study is one of the first examples for rare earth metal-mediated group transfer polymerization (REM-GTP) with non-metallocene catalyst systems. 2-Methoxyethylaminobis(phenolate)yttrium trimethylsilylmethyl complexes were synthesized and showed moderate to high activities in the rare ...

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Multiresponsive Microcapsules Based on Multilayer Assembly of Star Polyelectrolytes

10.11.2014 | Weinan Xu; Petr A. Ledin; Felix A. Plamper; Christopher V. Synatschke; Axel H. E. Müller; Vladimir V. Tsukruk, Macromolecules, 2014

Star polyelectrolytes (poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA)) with dual (temperature and pH) responsive properties were utilized to fabricate multiresponsive microcapsules via layer-by-layer (LbL) assembly. The LbL microcapsules are very robust and uniform, with higher stability and ...

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Thermo-Rheological, Piezo-Rheological, and TVγ-Rheological Complexities of Viscoelastic Mechanisms in Polymers

10.11.2014 | K. L. Ngai; D. J. Plazek, Macromolecules, 2014

Experimental evidence are collected together to show in general the viscoelastic mechanisms of low and high molecular weight polymers have different dependences on temperature T, pressure P, and the same scaling product variable, TVγ, where V is the specific volume and γ is a material constant. ...

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Influence of Water on Protein Transitions: Morphology and Secondary Structure

07.11.2014 | Wenwen Huang; Sreevidhya Krishnaji; Olena Rabotyagova Tokareva; David Kaplan; Peggy Cebe, Macromolecules, 2014

Fibrous protein secondary structural transitions are affected by bound water. A family of specially designed recombinant spider silk-like block copolymers with a gradient of block length, hydrophobilicity, and degree of crystallinity was biosynthesized and characterized to demonstrate the effect ...

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Thermodynamic Interactions and Phase Behavior of Multicomponent Blends Containing Supercritical Carbon Dioxide, Styrene–Acrylonitrile Random Copolymer, and Deuterated Poly(methyl methacrylate)

07.11.2014 | Nicholas P. Young; Sebnem Inceoglu; Gregory M. Stone; Andrew J. Jackson; Steven R. Kline; Stéphane Costeux; Nitash P ..., Macromolecules, 2014

Small-angle neutron scattering (SANS) was used to probe the phase behavior of multicomponent mixtures of supercritical carbon dioxide (scCO2), styrene–acrylonitrile random copolymer, and deuterated poly(methyl methacrylate). Ternary mixtures were homogeneous at low carbon dioxide pressures (PCO2) ...

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