نتایج جستجو برای: thickness swelling

تعداد نتایج: 138141  

Journal: :علوم و تکنولوژی پلیمر 0
علیرضا شاکری تقی طبرسا محمد تسوجی

the acrylated epoxidized soy oil (aeso) was synthesized from epoxidized soy oil and its properties were investigated.  wheat straw particle boards were produced by the synthesized resin with 8% and 13% contents based on straws weight at three pressing times: 8,10 and 12 min. boards’ modulus of rapture, modulus of elasticity, internal bonding, minimum degree of thickness change and water absorpt...

Journal: :پژوهش های علوم و فناوری چوب و جنگل 0

in this research, water and steam absorption behavior and also effect of maleic anhydride polypropylene (mapp) on these behaviors in wood fiber-polypropylene composite were compared. for this purpose, the composites were manufactured from 60% fibers and 40% polypropylene in presence and absence of ma. the oven dried samples with dimensions of 2.5×2.5×1 cm were immersed in distilled water and ex...

2011
Behzad Kord

The effect of wood flour and coupling agent content on the hygroscopic thickness swelling rate of polypropylene composites was investigated in this study. To meet this objective, the wood flour was compounded with polypropylene and coupling agent in an internal mixer; then the samples were fabricated by injection molding. The concentration was varied from 40 to 60% for wood flour and from 0 to ...

Journal: :پژوهش های علوم و فناوری چوب و جنگل 0

influences of the wood fiber acetylation as well as the compatibilizer mapp on water absorption, thickness swelling and dimensional stability of acetylated wood/ polypropylene composites (wpcs) were the main concerns of this research. wood fibers were acetylated with acetic anhydride without using any catalyst to achieve weight percent gains (wpgs) of 4.5, 7.5 and 17.6%. the acetylated fibers w...

2012
Elisha Ncube

Strand board can be manufactured from sawmill residues, branches, and crown wood left in the forest. The thickness swelling of these residues is quite different from that of mature wood and can have a negative effect on the physical and strength properties of strand board. A mixture of these materials and pressing conditions can be optimized by assessing thickness swelling of wood strands after...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2004
Bryan D Vogt Christopher L Soles Ronald L Jones Chia-Ying Wang Eric K Lin Wen-li Wu Sushil K Satija Dario L Goldfarb Marie Angelopoulos

Moisture absorption in model photoresist films of poly(4-hydroxystryene) (PHOSt) and poly(tert-butoxycarboxystyrene) (PBOCSt) supported on silicon wafers was measured by X-ray and neutron reflectivity. The overall thickness change in the films upon moisture exposure was found to be dependent upon the initial film thickness. As the film becomes thinner, the swelling is enhanced. The enhanced swe...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد علوم دارویی - دانشکده داروسازی 1392

داروهای ضدالتهاب غیراستروئیدی یکی از پر مصرف ترین گروه های دارویی در درمان درد و التهاب و تب مطرح هستند. اما عوارض جانبی آنها از جمله عوارض گوارشی و کلیوی استفاده از این داروها را محدود می کند. یکی از مهمترین عوامل در ایجاد این عوارض جانبی، مهار آنزیم های سیکلواکسیژناز و سنتز پروستاگلاندین های محافظ می باشد، علاوه بر این، اثرات مخرب برخی از داروهای nsaids بر دستگاه گوارش ناشی از طبیعت اسیدی آنه...

Journal: :Soft matter 2014
Clinton G Wiener R A Weiss Bryan D Vogt

The thin film behavior of poly(N-isopropylacrylamide-stat-2-(N-ethylperfluorooctane sulfonamido)ethyl acrylate) (NIPAAm-stat-FOSA) based hydrogels containing 5 mol% FOSA was elucidated using quartz crystal microbalance with dissipation (QCM-D) in combination with spectroscopic ellipsometry (SE) through examination of the lower critical solution temperature (LCST) and temperature dependent swell...

Journal: :Biomacromolecules 2005
Susan E Burke Christopher J Barrett

The reversible swelling behavior of multilayer films containing hyaluronic acid and polyallylamine hydrochloride was investigated using in situ ellipsometry, since many of the natural functions and applied uses of hyaluronic acid are related to the extraordinary ability of this biopolymer to swell, and to respond conformationally to the local solution environment. This swelling was observed to ...

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