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3.784 Aktuelle Fachpublikationen zum Thema temperature

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Modification of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) properties by reactive blending with a monoterpene derivative

25.07.2015 | Laura Pilon, Catherine Kelly, Journal of Applied Polymer Science, 2015

ABSTRACT A one‐step reactive blending approach is reported for modification of the thermal and mechanical properties of poly (3‐hydroxybutyrate‐co‐3‐hydroxyvalerate). A free‐radical initiated reaction of the monoterpene derivative, linalool, was carried out with PHBV in the melt. This ...

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Preparation and properties of porous polytetrafluoroethylene hollow fiber membrane through mechanical operations

25.07.2015 | Guochang Liu, Congjie Gao, Xiaoming Li, Chungang Guo, Ying Chen, Jinglie Lv, Journal of Applied Polymer Science, 2015

ABSTRACT Porous polytetrafluoroethylene (PTFE) hollow fiber membranes were prepared from fine powder through a series of mechanical operations including paste extrusion, heat treatment, stretching and sintering. In contrast to conventional process, the heat treatment used in this study was ...

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Effects of maleic anhydride grafted polyethylene on rheological, thermal, and mechanical properties of ultra high molecular weight polyethylene/poly(ethylene glycol) blends

25.07.2015 | Shuai He, Hui He, Yingchun Li, Dongqing Wang, Journal of Applied Polymer Science, 2015

ABSTRACT Ultra‐high molecular weight polyethylene (UHMWPE) has gained considerable fame due to its excellent wear and mechanical properties, though the inferior processability has restricted its further extensive applications. In this study, a combination of UHMWPE and poly(ethylene glycol) ...

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A convection–diffusion porous media model for moisture transport in polymer composites: Model development and validation

24.07.2015 | Liangbiao Chen, Hsing‐Wei Chu, Xuejun Fan, Journal of Polymer Science Part B: Polymer Physics, 2015

ABSTRACT Moisture may cause many detrimental effects to polymers and their composites, thus inhibiting the applications of polymeric materials in hot and humid environments. In this article, a convection–diffusion porous media model is derived to better characterize rapid moisture transport in ...

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Thermoplastic softening behavior of organically modified polyoxotitanates: Effects of the amount of water and benzoylacetone for hydrolyzing alkoxides

23.07.2015 | Shinya Oda, Hiromitsu Kozuka, Hiroaki Uchiyama, Journal of Applied Polymer Science, 2015

ABSTRACT Organically modified polyoxotitanates were prepared by hydrolyzing titanium tetra‐n‐butoxide in the presence of benzoylacetone (BzAc) in solution at Ti(OC4H9)4 : BzAc : H2O : CH3COCH3 mole ratios of 1 : (1 or 2) : (1 or 10) : 20. The solutions were concentrated at 80°C and dried at ...

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Characterization of recycled styrene butadiene rubber ground tire rubber: Combining X‐ray fluorescence, differential scanning calorimetry, and dynamical thermal analysis for quality control

23.07.2015 | Huan Liang, Denis Rodrigue, Josée Brisson, Journal of Applied Polymer Science, 2015

ABSTRACT Appraisal of the main rubber characterization techniques for styrene butadiene rubber (SBR) was performed on standard SBR samples as well as recycled ground tire rubber (GTR) from an industrial tire recycling facility, containing a blend of SBR and natural rubber. The aim of the work ...

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Eurocode method for calculating the external steelwork temperature in fire; comparative studies

22.07.2015 | Valdir Pignatta Silva, Macksuel Soares Azevedo, Fire and Materials, 2015

Summary To design a steel structure in fire is necessary to know its temperature. Using the data from many experimental fire tests, Margaret Law estimated the maximum temperature in a compartment (natural fire), the external heat transfer to steel elements and the maximum temperature value for ...

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Comparison of the variable importance in projection (VIP) and of the selectivity ratio (SR) methods for variable selection and interpretation

22.07.2015 | Mireia Farrés, Stefan Platikanov, Stefan Tsakovski, Romà Tauler, Journal of Chemometrics, 2015

This study compares the application of two variable selection methods in partial least squares regression (PLSR), the variable importance in projection (VIP) method and the selectivity ratio (SR) method. For this purpose, three different data sets were analysed: (a) physiochemical water quality ...

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Ab initio/GIAO‐CCSD(T) 13C NMR study of the rearrangement and dynamic aspects of rapidly equilibrating tertiary carbocations, C6 H13+ and C7 H15+

20.07.2015 | George A. Olah, G. K. Surya Prakash, Golam Rasul, Journal of Computational Chemistry, 2015

The rearrangement pathways of the equilibrating tertiary carbocations, 2,3‐dimethyl‐2‐butyl cation (C6 , 1), 2,3,3‐trimethyl‐2‐butyl cation (C7 , 5) and 2,3‐dimethyl‐2‐pentyl cation (C7 , 8 and 9) were investigated using the ab initio/GIAO‐CCSD(T) 13C NMR method. Comparing the calculated and ...

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A new NMR approach for structure determination of thermally unstable biflavanones and application to phytochemicals from Garcinia buchananii

20.07.2015 | Timo D. Stark, Sofie Lösch, Mathias Salger, Onesmo B. Balemba, Junichiro Wakamatsu, Oliver Frank, Thomas Hofmann, Magnetic Resonance in Chemistry, 2015

Abstract Previous activity‐guided phytochemical studies on Garcinia buchananii stem bark, which is traditionally used in Africa to treat various gastrointestinal and metabolic illnesses, revealed xanthones, polyisoprenylated benzophenones, flavanone‐C‐glycosides, biflavonoids, and/or ...

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