نتایج جستجو برای: polystyrenes

تعداد نتایج: 5181  

Journal: :Physical chemistry chemical physics : PCCP 2015
Tao Zhang Zhiguang Xu Zengxiao Cai Qipeng Guo

Herein, we report the phase inversion of ionomer-stabilized emulsions to form high internal phase emulsions (HIPEs) induced by salt concentration and pH changes. The ionomers are sulfonated polystyrenes (SPSs) with different sulfonation degrees. The emulsion types were determined by conductivity measurements, confocal microscopy and optical microscopy, and the formation of HIPE organogels was v...

1999
Hyuneui Lim Yeonhee Lee Seunghee Han Youngsook Yoo Kang-Jin Kim

MALDI-TOF-MS is a soft ionization technique that has the potential to determine the molecular weight for various compounds, particularly for large biomolecules.1-3 Recently, considerable interest has been focused on the analysis of synthetic polymers by MALDI-MS.4 Compared with the traditional methods of polymer analysis, MALDI-MS can provide more abundant information on molecular weight, repea...

Journal: :Dalton transactions 2015
Keiji Ohno Akira Nagasawa Takashi Fujihara

Catalytic polymerization of styrene with a series of dinuclear nickel(II) complexes [{Ni(acac)}2{μ-C6H2-(N-Ph-R)4}] (R = 4-Et (1a), 4-OEt (1b), 2-OEt (1c), 2-Et (1d), and 2,6-Et2 (1e)) in the presence of methylaluminoxane was studied under various conditions to evaluate the substituent effect. The activity of 1a-1e, except 1c, increased with an increase in the reaction temperature, and the high...

Journal: :The European physical journal. E, Soft matter 2003
Wen-Li Wu Sharadha Sambasivan Chia-Ying Wang W E Wallace J Genzer D A Fischer

Near-edge X-ray absorption fine-structure (NEXAFS) spectroscopy was used to measure simultaneously the relaxation rates of polystyrene (PS) molecules at the free surface and in the bulk. The samples were uniaxially stretched and annealed at temperatures below the bulk glass transition temperature of PS. The surface and bulk chain relaxation was monitored by measuring the partial-electron and th...

2016
Carlo Ingrao Agata Lo Giudice Jacopo Bacenetti Amin Mousavi Khaneghah Roberto Rana Valentina Siracusa

2016
James A. Dolan Matthias Saba Raphael Dehmel Ilja Gunkel Yibei Gu Ulrich Wiesner Ortwin Hess Timothy D. Wilkinson Jeremy J. Baumberg Ullrich Steiner Bodo D. Wilts

Gold gyroid optical metamaterials are known to possess a reduced plasma frequency and linear dichroism imparted by their intricate subwavelength single gyroid morphology. The anisotropic optical properties are, however, only evident when a large individual gyroid domain is investigated. Multidomain gyroid metamaterials, fabricated using a polyisoprene-b-polystyrene-b-poly(ethylene oxide) triblo...

Journal: :British medical journal 1976
W Brumfitt J M Hamilton-Miller M Bakhtiar J Cooper

The bacterial flora of the female periurethral area was studied by impression cultures taken by polystyrene sponges, the results being recorded by photographic contact printing. With this technique it is possible to observe the preferential colonisation of different areas by different organisms and to detect persistent colonisation by pathogens. In assessing the possible aetiological importance...

Journal: :Optics express 2014
JaeHwang Jung YongKeun Park

The spectro-angular light scattering measurements of individual microscopic objects are presented. Using spectroscopic quantitative phase microscopy and Fourier transform light scattering, the 2D angle-resolved light scattering intensity and phase patterns are measured in a spectral range of 450-750 nm and an angular range of -70-70°. The spectro-angular light scattering measurements of individ...

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