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3.576 Aktuelle Fachpublikationen zum Thema temperature

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Reaction of OH radical and ozone with methyl salicylate – a DFT study

10.04.2015 | A. Mano Priya, Lakshmipathi Senthilkumar, Journal of Physical Organic Chemistry, 2015

A theoretical study on the reaction mechanism of methyl salicylate (MeSA), a green leaf volatile organic compound with OH radical and ozone, has been carried out using density functional theory methods using B3LYP, M06‐2X and MPW1K functionals with 6‐311++G(d,p) basis set. The atmospheric ...

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Solvent‐free acetylation of lignocellulosic fibers at room temperature: Effect on fiber structure and surface properties

10.04.2015 | Meriem El Boustani, François Brouillette, Gilbert Lebrun, Ahmed Belfkira, Journal of Applied Polymer Science, 2015

ABSTRACT Acetylation is one of the most interesting chemical treatments to improve the affinity of lignocellulosic fibers with polymeric matrices for the elaboration of several types of composites. In this paper, the acetylation of flax and wood pulp (bleached softwood Kraft pulp and ...

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Preparation of poly(propylene carbonate)/nano calcium carbonate composites and their supercritical carbon dioxide foaming behavior

08.04.2015 | Peng Yu, Hao‐Yang Mi, An Huang, Xian Liu, Bin‐Yi Chen, Shui‐Dong Zhang, Xiang‐Fang Peng, Journal of Applied Polymer Science, 2015

ABSTRACT Biodegradable polymer foams are attracting extensive attention in both academic and industrial fields. In this study, an emerging biodegradable polymer, poly(propylene carbonate) (PPC), was compounded with nano calcium carbonate (nano‐CaCO3) and foamed via supercritical carbon dioxide ...

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The adsorption behaviors of the multiple stimulus‐responsive poly(ethylene glycol)‐based hydrogels for removal of RhB dye

08.04.2015 | Zhicheng Yuan, Yang Wang, Xiao Han, Dajun Chen, Journal of Applied Polymer Science, 2015

ABSTRACT In this article, the multiple stimulus‐responsive organic/inorganic hybrid hydrogels by combining poly(2‐(2‐methoxyethoxy) ethyl methacrylate‐co‐oligo (ethylene glycol) methacrylate‐co‐acrylic acid) (PMOA) hydrogel with magnetic attapulgite/Fe3O4 (AT‐Fe3O4) nanoparticles were applied ...

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Control of swelling properties of polyvinyl alcohol/hyaluronic acid hydrogels for the encapsulation of chondrocyte cells

08.04.2015 | Sami Pirinen, Jennika Karvinen, Virpi Tiitu, Mika Suvanto, Tuula T. Pakkanen, Journal of Applied Polymer Science, 2015

ABSTRACT Hydrogel scaffolds for tissue engineering are important biomaterials. The target in this study was to prepare polyvinyl alcohol/hyaluronic acid hydrogels for the encapsulation of chondrocyte cells by a simple cross‐linking reaction. Control of the swelling properties and morphology of ...

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Enhancement of the photoluminescence and long afterglow properties of Sr2MgSi2O7:Eu2+ phosphor by Dy3+ co‐doping

07.04.2015 | Ishwar Prasad Sahu, D. P. Bisen, Nameeta Brahme, Manju Ganjir, Luminescence, 2015

ABSTRACT Sr2MgSi2O7:Eu2+ and Sr2MgSi2O7:Eu2+,Dy3+ long afterglow phosphors were synthesized under a weak reducing atmosphere by the traditional high temperature solid state reaction method. The synthesized phosphors were characterized by powder X‐ray diffraction (XRD), energy dispersive X‐ray ...

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Evolution of the crystalline structure and cyclization with changing tension during the stabilization of polyacrylonitrile fibers

04.04.2015 | Chang Liu, Leiyang Hu, Yonggen Lu, Weizhe Zhao, Journal of Applied Polymer Science, 2015

ABSTRACT The effects of tension on the crystalline structure and cyclization of polyacrylonitrile fibers during stabilization were investigated. The degree of cyclization was measured by Fourier transform infrared spectroscopy and differential scanning calorimetry. The crystalline structure ...

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Mechanical properties of gradient copolymers of styrene and n‐butyl acrylate

03.04.2015 | Yunlong Guo, Xiang Gao, Yingwu Luo, Journal of Polymer Science Part B: Polymer Physics, 2015

ABSTRACT The mechanical properties of linear and V‐shaped compositional gradient copolymer of styrene and n‐butyl acrylate with composition of around 55 wt % styrene were investigated by comparing with their block copolymer counterparts. Compared with their block copolymer counterparts, the ...

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Solid‐state microcellular and nanocellular polysulfone foams

03.04.2015 | Huimin Guo, Andrei Nicolae, Vipin Kumar, Journal of Polymer Science Part B: Polymer Physics, 2015

ABSTRACT In this article, we report on the process for creating microcellular and nanocellular polysulfone (PSU) foams. Microcellular foams with cell size up to 8 µm and nanocellular foams with cell size in the range of 20–30 nm were created. A range of CO2 concentration was achieved by ...

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Τhe effect of wood‐fiber type on the thermomechanical performance of a biodegradable polymer matrix

01.04.2015 | Panayiotis Georgiopoulos, Evagelia Kontou, Journal of Applied Polymer Science, 2015

ABSTRACT The effect of type and content of wood fibers on the thermal, mechanical and rheological behavior of the commercial biodegradable polyester product, Ecovio® (BASF) is analytically studied. Ecovio® is basically a blend of poly(butylene adipate‐terephthalate) copolyester (Ecoflex®, ...

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