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577 Aktuelle Fachpublikationen zum Thema temperature

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Direct Arylation Polycondensation of Bithiazole Derivatives with Various Acceptors

24.10.2014 | Masahiro Kuramochi; Junpei Kuwabara; Wei Lu; Takaki Kanbara, Macromolecules, 2014

Novel π-conjugated polymers with a bithiazole unit and various acceptor units were synthesized by polycondensation via Pd-catalyzed direct arylation. The results of polycondensation reactions depend on chalcogen elements in the monomers. The presence of a Se atom inhibited polymerization, ...

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ATRP of POSS Monomers Revisited: Toward High-Molecular Weight Methacrylate–POSS (Co)Polymers

23.10.2014 | Vladimír Raus; Eva Čadová; Larisa Starovoytova; Miroslav Janata, Macromolecules, 2014

For the first time, ATRP was successfully employed for homopolymerization of a commercial methacrylate-functionalized polyhedral oligomeric silsesquioxane (POSS) monomer, iBuPOSSMA, to high molecular weights. It was found that iBuPOSSMA has a low ceiling temperature (Tc); therefore, low ...

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Triblock Copolymer Self-Assembly in Ionic Liquids: Effect of PEO Block Length on the Self-Assembly of PEO–PPO–PEO in Ethylammonium Nitrate

22.10.2014 | Carlos R. López-Barrón; Dongcui Li; Norman J. Wagner; Jeffrey L. Caplan, Macromolecules, 2014

The microstructure and rheological properties of micellar solutions of Pluronic block copolymers (PEOx–PPOy–PEOx) in deuterated ethylammonium nitrate (dEAN, a protic ionic liquid) are studied by small- and ultrasmall-angle neutron scattering (SANS and USANS), fluorescence microscopy, and shear ...

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A New Strategy To Synthesize Temperature- and pH-Sensitive Multicompartment Block Copolymer Nanoparticles by Two Macro-RAFT Agents Comediated Dispersion Polymerization

21.10.2014 | Pengfei Shi; Quanlong Li; Xin He; Shentong Li; Pingchuan Sun; Wangqing Zhang, Macromolecules, 2014

Multicompartment block copolymer nanoparticles (MCBNs) arouse great interest due to their special structure and wide application. However, synthesis of MCBNs suffers from great inconvenience and difficulty. In this contribution, an efficient strategy to prepare well-defined temperature- and ...

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Poly(phenylenevinylene)s as Sensitizers for Visible Light Induced Cationic Polymerization

20.10.2014 | Semih Erdur; Gorkem Yilmaz; Demet Goen Colak; Ioan Cianga; Yusuf Yagci, Macromolecules, 2014

A novel visible light sensitive photoinitiating system for the cationic polymerization of oxiranes such as cyclohexene oxide (CHO) and vinly monomers such as isobutyl vinylether (IBVE) and N-vinyl carbazole (NVC) using poly(phenylenevinylene) (PPV) derivatives as photosensitizers is described. ...

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Stereoblock-like Brush Copolymers Consisting of Poly(l-lactide) and Poly(d-lactide) Side Chains along Poly(norbornene) Backbone: Synthesis, Stereocomplex Formation, and Structure–Property Relationship

16.10.2014 | Takuya Isono; Yohei Kondo; Shun Ozawa; Yougen Chen; Ryosuke Sakai; Shin-ichiro Sato; Kenji Tajima; Toyoji Kakuchi; T ..., Macromolecules, 2014

Random and block copolymerizations of poly(l-lactide) (PLLA) and poly(d-lactide) (PDLA) macromonomers having an exo-norbornene group at the α- or ω-chain end (D/L ratio = 1/1, Mn = ca. 5000 g mol–1) were performed via ring-opening metathesis polymerization to produce the brush random and block ...

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Size Effect of Nanoparticle Diffusion in a Polymer Melt

09.10.2014 | Christopher A. Grabowski; Ashis Mukhopadhyay, Macromolecules, 2014

We investigated the dynamics of gold nanoparticles (NPs) within an entangled liquid of poly(n-butyl methacrylate) (PBMA) above the glass transition temperature (Tg). The experiments were performed by using a modified version of fluctuation correlation spectroscopy (FCS), which measured the ...

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Synthesis and Chiroptical Properties of Helical Polyallenes Bearing Chiral Amide Pendants

08.10.2014 | Yuan-Yuan Zhu; Ting-Ting Yin; Xue-Liang Li; Ming Su; Ya-Xin Xue; Zhi-Peng Yu; Na Liu; Jun Yin; Zong-Quan Wu, Macromolecules, 2014

Two allene derivatives, l- and d-N-(1-(octylamino)-1-oxopropan-2-yl)-4-(propa-1,2-dien-1-yloxy)benzamide (l-1 and d-1), bearing chiral amide pendants were designed and synthesized. Living polymerizations of l-1 and d-1 with allylnickel complex as a catalyst afforded poly-l-1m and poly-d-1m with ...

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Probing Self-Assembly of Cylindrical Morphology Block Copolymer Using in Situ and ex Situ Grazing Incidence Small-Angle X-ray Scattering: The Attractive Case of Graphoepitaxy

07.10.2014 | Mireille Maret; Raluca Tiron; Xavier Chevalier; Patrice Gergaud; Ahmed Gharbi; Céline Lapeyre; Jonathan Pradelles; V ..., Macromolecules, 2014

The self-assembly of polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) copolymer (BCP) films, leading to hexagonal arrays of perpendicular PMMA cylinders in a PS matrix, and its ordering kinetics were investigated using ex situ and in situ grazing incidence small-angle X-ray scattering ...

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SP–PLP–EPR Measurement of Iron-Mediated Radical Termination in ATRP

29.09.2014 | Hendrik Schroeder; Michael Buback, Macromolecules, 2014

Radical termination was studied in the presence of iron(II) bromide, which is an attractive catalyst for atom-transfer radical polymerization (ATRP). Termination rate is measured in both the absence and presence of FeII via time-resolved EPR spectroscopy of propagating radicals produced by ...

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