نتایج جستجو برای: polyurethane dispersions

تعداد نتایج: 12849  

Journal: :Applied biochemistry and biotechnology 2013
Daewon Park Alyssa M Larson Alexander M Klibanov Yadong Wang

We have prepared and characterized a new polyurethane-based antimicrobial material, N,N-dodecyl,methyl-polyurethane (Quat-12-PU). It exhibits strong antiviral and antibacterial activities when coated (as an organic solution or an aqueous nanosuspension) onto surfaces and antibacterial activity when electrospun into nanofibers. Quat-12-PU surfaces are able to kill airborne Gram-positive Staphylo...

Journal: :international journal of nanoscience and nanotechnology 2015
m. nadafan r. malekfar z. dehghani

in this research the composition of polyurethane closed cell (pucc) with two different concentrations of sio2 nanoparticles (1.0 and 2.0 wt%) have been prepared. optical microscopy and sem imaging, watering uptake, ftir and raman spectroscopy of the synthesized samples were carried out. the optical microscopy imaging of samples showed differences in the appearance of matrix produced by applying...

Journal: Physical Treatments 2023

Purpose: Military boots’ mileage is a main factor that can be influence the risk of sustaining injuries during running. The aim of the present study was to evaluate the effect of three types of military boots’ mileage on knee muscular co-contraction during running. Methods: Fifteen healthy males received three new pairs of military boots. They were asked to wear these shoes for over 6 months. ...

2016
Jin-Oh Jeong Jong-Seok Park Youn-Mook Lim

Polyurethane (PU) is the fifth most common polymer in the general consumer market, following Polypropylene (PP), Polyethylene (PE), Polyvinyl chloride (PVC), and Polystyrene (PS), and the most common polymer for thermosetting resins. In particular, polyurethane has excellent hardness and heat resistance, is a widely used material for electronic products and automotive parts, and can be used to ...

Journal: :Journal of vascular and interventional radiology : JVIR 2010
Cheng K Ong Sudhakar K Venkatesh Gabriel B Lau Shih C Wang

PURPOSE The objective of this study was to evaluate and compare the relative durability and complications between the proximal valve polyurethane and distal valve silicone peripherally inserted central catheters (PICCs). METHODS Institutional review board approval was obtained. A total of 326 patients (mean age, 50.4 years) was assigned randomly to receive either a proximal valve polyurethane...

Journal: :Journal of biomedical materials research 1995
K W van der Kamp K D Hauch J Feijen T A Horbett

During blood-material interaction, the enzymes factor XII fragment (factor XIIf) and kallikrein are generated (contact activation). In this study, the enzymatic activities of factor XIIf and kallikrein were examined with an assay based on the conversion of tripeptide-p-nitroanilide substrate. With the use of aprotinin to inhibit kallikrein, the proteolytic activities of factor XIIf and kallikre...

2016
Hiroshi Kobayashi Makoto Hayashi Masaru Yamaoka Takuya Yasukawa Haruna Ibi Bunnai Ogiso

Evaluating periodontal tissue condition is an important diagnostic parameter in periodontal disease. Noncontact electromagnetic vibration device (NEVD) was previously developed to monitor this condition using mechanical parameters. However, this system requires accelerometer on the target tooth. This study assessed application of laser displacement sensor (LDS) to NEVD without accelerometer usi...

Journal: :Journal of rehabilitation research and development 1985
J J Kauzlarich J G Thacker

The hysteresis loss theory of rolling resistance is developed for solid rubber wheelchair tires. The analysis is used to correlate test data for a clay-filled natural rubber and a polyurethane tire material. A discussion of tire rolling work, hysteresis loss factor measurement, and rolling loss measurement is presented. An example calculation of rolling resistance for a polyurethane tire is giv...

Journal: :Acta of bioengineering and biomechanics 2017
Sarah Hensley Mackenzie Christensen Scott Small Derek Archer Emily Lakes Renee Rogge

PURPOSE Previous biomechanical studies have estimated the strains of bone and bone substitutes using strain gages. However, applying strain gages to biological samples can be difficult, and data collection is limited to a small area under the strain gage. The purpose of this study was to compare digital image correlation (DIC) strain measurements to those obtained from strain gages in order to ...

2015
Salmiah Ibrahim Azizan Ahmad Christine Wandrey

Castor oil-based polyurethane as a renewable resource polymer has been synthesized for application as a host in polymer electrolyte for electrochemical devices. The polyurethane was added with LiI and NaI in different wt% to form a film of polymer electrolytes. The films were characterized by using attenuated total reflectance-Fourier transform infrared spectroscopy, dynamic mechanical analysis...

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