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622 Aktuelle Fachpublikationen zum Thema temperature

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Photoinduced Synthesis of α,ω-Telechelic Sequence-Controlled Multiblock Copolymers

27.02.2015 | Athina Anastasaki; Vasiliki Nikolaou; Nicholas William McCaul; Alexandre Simula; Jamie Godfrey; Christopher Waldron; ..., Macromolecules, 2015

Photoinduced living radical polymerization has been employed to synthesize α,ω-telechelic multiblock copolymers of a range of acrylic monomers including methyl acrylate (MA), ethyl acrylate (EA), ethylene glycol methyl ether acrylate (EGA), and solketal acrylate (SA). Under carefully optimized ...

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Influence of Hydrophobic Face Amino Acids on the Hydrogelation of β-Hairpin Peptide Amphiphiles

23.02.2015 | Christopher M. Micklitsch; Scott H. Medina; Tuna Yucel; Katelyn J. Nagy-Smith; Darrin J. Pochan; Joel P. Schneider, Macromolecules, 2015

Hydrophobic residues provide much of the thermodynamic driving force for the folding, self-assembly, and consequent hydrogelation of amphiphilic β-hairpin peptides. We investigate how the identity of hydrophobic side chains displayed from the hydrophobic face of these amphiphilic peptides ...

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Reason for the High Solubility of Chemically Modified Poly(vinyl alcohol)s in Aqueous Solution

23.02.2015 | Kengo Arai; Misumi Okuzono; Toshiyuki Shikata, Macromolecules, 2015

Partially chemically modified poly(vinyl alcohol) synthesized via random introduction of a diol-type monomer (mPVA) shows much higher solubility in water than normal homo poly(vinyl alcohol) (PVA). To clarify the reason for the high solubility of mPVA, we investigated the temperature dependencies ...

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Synthesis and Redispersibility of Poly(styrene-block-n-butyl acrylate) Core–Shell Latexes by Emulsion Polymerization with RAFT Agent–Surfactant Design

20.02.2015 | Feizhou Wang; Yingwu Luo; Bo-Geng Li; Shiping Zhu, Macromolecules, 2015

A coagulatable and redispersible poly(styrene-block-n-butyl acrylate) (PS-b-PnBA) copolymer latex system was developed. A series of PS-b-PnBA diblock copolymers with the PnBA content up to 70 wt % were prepared via a reversible addition–fragmentation chain transfer (RAFT) emulsion polymerization. ...

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Mechanoactivation of Spiropyran Covalently Linked PMMA: Effect of Temperature, Strain Rate, and Deformation Mode

19.02.2015 | Jae Woo Kim; Yukyung Jung; Geoffrey W. Coates; Meredith N. Silberstein, Macromolecules, 2015

Polymer multifunctionality can be designed through the incorporation of chemical groups termed “mechanophores” that have a specific chemical transformation in response to applied force. The behavior of mechanophore-linked polymers depends on synthetic factors such as the choice of the ...

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Self-Assembly and Critical Solubility Temperature of Supramolecular Polystyrene Bottle-Brushes in Cyclohexane

16.02.2015 | Sylvain Catrouillet; Laurent Bouteiller; Erwan Nicol; Taco Nicolai; Sandrine Pensec; Boris Jacquette; Maël Le Bohec; ..., Macromolecules, 2015

The formation of polystyrene (PS) supramolecular bottle-brushes by self-assembly in cyclohexane of hydrogen-bonding tris(urea) units decorated by PS chains was investigated using light and neutron scattering. Atom transfer radical polymerization (ATRP) was used to control the length of the PS ...

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How Composition Determines the Properties of Isodimorphic Poly(butylene succinate-ran-butylene azelate) Random Biobased Copolymers: From Single to Double Crystalline Random Copolymers

26.12.2014 | Idoia Arandia; Agurtzane Mugica; Manuela Zubitur; Arantxa Arbe; Guoming Liu; Dujin Wang; Rosica Mincheva; Philippe D ..., Macromolecules, 2014

The structure, morphology, and thermal properties of biobased and biodegradable poly(butylene succinate-ran-butylene azelate) random copolyesters with a wide composition range were studied. These PBS-ran-PBAz copolymers can crystallize in the entire composition range despite being random, ...

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Microphase Separation and Crystallization in All-Conjugated Poly(3-alkylthiophene) Diblock Copolymers

26.12.2014 | Jing Ge; Ming He; Nan Xie; Xiubao Yang; Zhi Ye; Feng Qiu, Macromolecules, 2014

The microphase separation and crystallization of all-conjugated poly(3-butylthiophene)-b-poly(3-dodecylthiophene) (P3BDDT) diblock copolymers were systematically investigated by temperature-resolved wide-angle X-ray diffraction (WAXD), Fourier transform infrared (FTIR), and synchrotron ...

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Nitroxide-Mediated Polymerization of 2-(Diethylamino)ethyl Methacrylate (DEAEMA) in Water

26.12.2014 | Ali Darabi; Abbas Rezaee Shirin-Abadi; Philip G. Jessop; Michael F. Cunningham, Macromolecules, 2014

Nitroxide-mediated polymerization (NMP) of 2-(diethylamino)ethyl methacrylate (DEAEMA) with a small amount of acrylonitrile (AN) as a comonomer was performed for the first time in water at 90 °C and atmospheric pressure using n-hydroxysuccinimidyl BlocBuilder (NHS-BB) alkoxyamine without addition ...

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Micellar Morphologies of Block Copolymer Solutions near the Sphere/Cylinder Transition

24.12.2014 | Chya Yan Liaw; Kevin J. Henderson; Wesley R. Burghardt; Jin Wang; Kenneth R. Shull, Macromolecules, 2014

The thermoreversible self-assembly of poly(methyl methacrylate)-b-poly(tert-butyl methacrylate) (PMMA–PtBMA) diblock copolymers in 2-ethylhexanol has been studied in the transition regime between spherical and cylindrical morphologies. In these materials the PMMA block exhibits a strong ...

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