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593 Aktuelle Fachpublikationen zum Thema temperature

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Self-Consistent Real Space Free Energy Calculations for Polyethylene and Isotactic Polypropylene Crystals and Interfaces

20.11.2014 | Michael P. Howard; Scott T. Milner, Macromolecules, 2014

Surface free energies for (100) and (010) orthorhombic polyethylene (PE) and α1 isotactic polypropylene (iPP) are calculated with self-consistent real space quasi-harmonic lattice dynamics methods. PE is used as a model system to systematically explore the accuracy of real space calculations ...

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Copolymerization and Synthesis of Multiply Binding Histamine Ligands for the Robust Functionalization of Quantum Dots

19.11.2014 | Anand Viswanath; Yi Shen; Alexandra N. Green; Rui Tan; Andrew B. Greytak; Brian C. Benicewicz, Macromolecules, 2014

The polymeric functionalization of quantum dots via ligand exchange is a robust method for the preparation of stable fluorescent particles with high quantum yields. For most biological applications of quantum dots, water solubility is a key requirement; to achieve biocompatibility, polymeric ...

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Analytical Solution of Free Radical Polymerization: Applications- Implementing Gel Effect Using CCS Model

18.11.2014 | Dhiraj K. Garg; Christophe A. Serra; Yannick Hoarau; Dambarudhar Parida; M. Bouquey; R. Muller, Macromolecules, 2014

This article presents the implementation of the Chiu, Carratt, and Soong (CCS) gel/glass model in an analytical solution (AS) derived for the free radical polymerization under isothermal condition. This implantation allows AS to be applicable for the whole range of conversion thus making it more ...

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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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