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572 Aktuelle Fachpublikationen zum Thema temperature

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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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Study of the Dynamic Heterogeneity in Poly(ethylene-ran-vinyl acetate) Copolymer by Using Broadband Dielectric Spectroscopy and Electrostatic Force Microscopy

13.09.2013 | Mohammed M. Kummali; Angel Alegría; Luis A. Miccio; Juan Colmenero, Macromolecules, 2013

Dynamic heterogeneities in ethylene–vinyl acetate (EVA) random copolymers were studied using broadband dielectric spectroscopy (BDS) over a broad frequency and temperature range. BDS data for EVA copolymers show relatively broad spectra extending over several frequency decades, which make ...

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RAFT Synthesis and Aqueous Solution Behavior of Novel pH- and Thermo-Responsive (Co)Polymers Derived from Reactive Poly(2-vinyl-4,4-dimethylazlactone) Scaffolds

12.09.2013 | Jing Yang Quek; Yicheng Zhu; Peter J. Roth; Thomas P. Davis; Andrew B. Lowe, Macromolecules, 2013

Well-defined homopolymers of 2-vinyl-4,4-dimethylazlactone (VDA) and AB diblock copolymers of VDA with N,N-dimethylacrylamide (DMA) and N-isopropylacrylamide (NIPAM) prepared by reversible addition–fragmentation chain transfer (RAFT) radical polymerization are reported. VDA homopolymers reacted ...

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Novel High Molecular Weight Aromatic Fluorinated Polymers from One-Pot, Metal-Free Step Polymerizations

12.09.2013 | Lilian I. Olvera; Maria T. Guzmán-Gutiérrez; Mikhail G. Zolotukhin; Sergei Fomine; Jorge Cárdenas; Fransico A. Ruiz- ..., Macromolecules, 2013

A novel series of linear, high-molecular-weight polymers and copolymers was synthesized by one-pot, metal-free superacid-catalyzed reaction of trifluoromethylalkyl (1a–1c) and trifluoromethylaryl (1d–1h) ketones with the linear, nonactivated, multiring aromatic hydrocarbons biphenyl (A), ...

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Dynamic Heterogeneity and Phase Separation Kinetics in Miscible Poly(vinyl acetate)/Poly(ethylene oxide) Blends by Local Dielectric Spectroscopy

12.09.2013 | Tomas P. Corrales; David Laroze; George Zardalidis; George Floudas; Hans-Jürgen Butt; Michael Kappl, Macromolecules, 2013

Local dielectric spectroscopy (LDS) was employed to analyze the miscible blend composed of poly(vinyl acetate) (PVAc) and poly(ethylene oxide) (PEO). The two homopolymers have very different relaxation times and glass transition temperatures. The aim was to study the dynamic heterogeneity in ...

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Critical Phenomenon During Drying of Semiaromatic, Transparent and Soluble Polyimide Cast Films: Real-Time Observation of Birefringence and Other Integrated Parameters

10.09.2013 | Yuji Eguchi; Emre Unsal; Miko Cakmak, Macromolecules, 2013

A newly developed real-time multifunctional monitoring system was used to track in-plane and out-of-plane birefringence, weight, thickness and surface temperature of semiaromatic, transparent, and soluble polyimide cast films during drying. At a critical point during drying, out-of-plane ...

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