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609 Aktuelle Fachpublikationen zum Thema temperature

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Quadruple-Stimuli-Sensitive Polymeric Nanocarriers for Controlled Release under Combined Stimulation

12.12.2014 | Ziquan Cao; Hao Wu; Jie Dong; Guojie Wang, Macromolecules, 2014

Here we report a novel quadruple-stimuli-responsive block copolymer nanocarrier sensitive to pH, temperature, light, and reducing agent. The well-defined amphiphilic diblock copolymer poly(2-nitrobenzyl methacrylate)-SS-poly(dimethylaminoethyl methacrylate) (PNBM-SS-PDMAEMA) was synthesized via ...


Direct Formation of Different Crystalline Forms in Butene-1/Ethylene Copolymer via Manipulating Melt Temperature

11.12.2014 | Yaotao Wang; Ying Lu; Jiayi Zhao; Zhiyong Jiang; Yongfeng Men, Macromolecules, 2014

The crystallization behavior of a butene-1/ethylene random copolymer with 9.88 mol % ethylene counits was investigated by means of differential scanning calorimetry, wide- and small-angle X-ray scattering, and polarized optical microscopy. Unlike in its homopolymer counterpart which crystallizes ...


Temperature Driven Macromolecule Separation by Nanoconfinement

10.12.2014 | Ilaria De Santo; Filippo Causa; Paolo A. Netti, Macromolecules, 2014

We focused on the influence of temperature variations on macromolecule partitioning between unconfined and nanoconfined areas in nanoslits using single molecule measurements. We evaluated the number of fluorescent poly(ethylene glycol) (PEG) molecules confined in glass nanoslits in several ...


How Hollow Are Thermoresponsive Hollow Nanogels?

09.12.2014 | Janine Dubbert; Tobias Honold; Jan Skov Pedersen; Aurel Radulescu; Markus Drechsler; Matthias Karg; Walter Richtering, Macromolecules, 2014

A main challenge in colloid science is the development of smart delivery systems that store and protect actives from degradation and allow release in response to an external stimulus like temperature. Hollow nanogel capsules made of temperature-sensitive polymers are particularly promising ...


Shear- and Temperature-Induced Graphene Network Evolution in Graphene/Polystyrene Nanocomposites and Its Influence on Rheological, Electrical, and Morphological Properties

04.12.2014 | F. Beckert; A. Held; J. Meier; R. Mülhaupt; C. Friedrich, Macromolecules, 2014

Herein we report on the characterization of rheological, morphological, and electrical properties of graphene/polystyrene nanocomposites as a function of graphene functionalization. Hydrophobic modified graphite oxide was grafted with polystyrene chains (PS-g-FG), thus enabling a high degree of ...


Relaxation of Ultrathin Polystyrene Films Hyperswollen in Supercritical Carbon Dioxide

04.12.2014 | J. K. Bal; T. Beuvier; M. S. Chebil; G. Vignaud; Y. Grohens; M. K. Sanyal; A. Gibaud, Macromolecules, 2014

Relaxation of highly swollen (∼20–80%) ultrathin (≤21 nm) polystyrene films exposed to supercritical carbon dioxide (at 35 °C and 80 bar) is studied by monitoring the evolution of thickness as a function of time using X-ray reflectivity. Correlations between their swelling (that determines the ...


Graphene/Hyperbranched Polymer Nanocomposites: Insight from Molecular Dynamics Simulations

03.12.2014 | Kostas Karatasos, Macromolecules, 2014

We explore by means of molecular dynamics (MD) simulations mixtures of graphene with hyperbranched polyesters (Boltorn) of two different pseudogenerations in a wide range of temperatures. Static and dynamic features of the polymeric component are probed in order to assess the effects of the ...


Growth of Polymer Nanorods with Different Core–Shell Dynamics via Capillary Force in Nanopores

02.12.2014 | Ye Sha; Linling Li; Xiaoliang Wang; Yuanxin Wan; Jie Yu; Gi Xue; Dongshan Zhou, Macromolecules, 2014

The dynamics of poly(n-butyl methacrylate) confined in porous anodic aluminum oxide (AAO) templates are investigated using differential scanning calorimetry (DSC) and fluorescence nonradiative energy transfer (NRET). Two glass transition temperatures (Tg,low and Tg,high) are obtained at higher ...


Synthesis of Anthracene-Based Donor–Acceptor Copolymers with a Thermally Removable Group for Polymer Solar Cells

02.12.2014 | Chunchen Liu; Wenzhan Xu; Xing Guan; Hin-Lap Yip; Xiong Gong; Fei Huang; Yong Cao, Macromolecules, 2014

A highly soluble anthracene cyclic adduct with a thermally cleavable substituent was synthesized, and it was used as a donor unit in a series of donor–acceptor type conjugated copolymers with improved processability. The removable group was eliminated under elevated temperature through retro ...


Analytical Solution of Free Radical Polymerization: Applications-Implementing Nonisothermal Effect

02.12.2014 | Dhiraj K. Garg; Christophe A. Serra; Yannick Hoarau; Dambarudhar Parida; M. Bouquey; R. Muller, Macromolecules, 2014

Analytical solution (AS), as derived in our previous works for isothermal free radical polymerization (FRP), has been extended to nonisothermal conditions in this work. Only one differential equation, i.e., the energy balance equation, was required to calculate temperature profile by stiff solver ...


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