Zobrazeno 1 - 10
of 24
pro vyhledávání: '"D.M. Koenhen"'
A preparation technique for examination of wet-spun polymer fibers in a scanning electron microscope
Publikováno v:
Colloid and polymer science, 253(7), 521-526. Springer
In this paper the technique is discussed of sample preparation for freshly wet-spun polymer fibers, to be examined by scanning electron microscopy. It makes use of cryogenic breaking of the samples, followed by freeze drying or freeze-etching of the
Publikováno v:
Ultramicroscopy, 3, 325-328. Elsevier
In this study the cryo-unit is introduced as a new and useful instrument to investigate water-containing specimens with the SEM. Often water-containing biological specimens are studied, but in our case we used water-swollen polymer membranes. The res
Publikováno v:
Journal of applied polymer science, 21(1), 199-215. Wiley
The formation of membranes from two systems has been studied. In the system polyurethane-dimethylformamide-water, the mechanism for the formation of the sponge-like structure proves to be a liquid-liquid phase separation with nucleation and growth of
Publikováno v:
Journal of Polymer Science: Polymer Symposia. 61:93-100
For the polymer-solvent system poly(phenylene oxide) in toluene the mechanism and kinetics of crystallization have been studied with the Pulse Induced Critical Scattering technique. It was found that after a delay-time the growth mechanism was diffus
Autor:
D.M. Koenhen, C.A. Smolders
Publikováno v:
Journal of Polymer Science: Polymer Chemistry Edition, 15(1), 155-166. Wiley-Liss Inc.
New experimental data have been collected on thermodynamic properties of solutions of poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) in toluene. The Flory-Huggins interaction parameters g have been determined from light scattering measurements. These v
Autor:
C.A. Smolders, D.M. Koenhen
Publikováno v:
Journal of applied polymer science, 19(4), 1163-1179. Wiley
Correlations of solvent solubility parameters with molar attraction constants and with properties like surface tension, dipole moment, and index of refraction have been explored. From relations found to be valid for solvents, it is possible to calcul
Autor:
D.M. Koenhen, C.A. Smolders
Publikováno v:
Journal of Polymer Science: Polymer Chemistry Edition, 15(1), 167-171. Wiley-Liss Inc.
The phase-separation phenomena observed in solutions of poly(2,6 dimethyl-1,4 phenylene oxide) in toluene have been investigated by differential scanning calorimetry. These measurements supplement the experimental evidence in favor of the concept tha
Publikováno v:
Journal of applied polymer science, 21(10), 2855-2859. Wiley
The uptake of tridodecylmethylammonium chloride (TDMAC) by poly(vinyl chloride) has been investigated to provide a more quantitative basis for the preparation of blood-compatible surfaces based on TDMAC-heparin coatings. Sorption isotherms of TDMAC f
Publikováno v:
Desalination, 32, 33-45. Elsevier
In this report we give a description of the membrane formation mechanism based on theoretical and experimental knowledge of phase separation phenomena in concentrated polymer solutions. We demonstrate that different types of phase separation are resp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b3d8569933231771c8c0f7e63b197f8f
https://research.utwente.nl/en/publications/c703431c-d875-4373-a799-066b09133a56
https://research.utwente.nl/en/publications/c703431c-d875-4373-a799-066b09133a56
Publikováno v:
Desalination, 22(1-3), 205-219. Elsevier
A study has been made of the formation of membranes from solutions of poly(2,6-dimethyl-1, 4-phenylene oxide) (P.P.0.2) in trichloro-ethylene/alcohol mixtures and using methanol as the precipitation agent. The mechanism of the formation of the sponge
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::208fe6f92008f278cc2b5bcabf051335
https://research.utwente.nl/en/publications/58059e0f-c350-4fbe-b5cb-1537aff3c112
https://research.utwente.nl/en/publications/58059e0f-c350-4fbe-b5cb-1537aff3c112