Influence of monomer reactivity on radiation grafting of phosphorus flame retardants on flax fabrics

Publication date: Available online 23 May 2019Source: Polymer Degradation and StabilityAuthor(s): Raymond Hajj, Belkacem Otazaghine, Rodolphe Sonnier, Roland El Hage, Sophie Rouif, Michel Nakhl, José-Marie Lopez-CuestaAbstractFlax fabrics were modified by radiation grafting method to improve their flame retardancy. Several phosphonated monomers with different carbon-carbon double bond reactivity were grafted. According to 1H NMR carried out on irradiated monomers solubilized in water, the reactivity is the highest for (acryloyloxy)methyl phosphonic acid (hPAAPC1), and the lowest for allyl phosphonic acid (APA). Nevertheless, grafting yield on flax, assessed by X-ray fluorescence and scanning electron microscopy showed a different tendency. Especially (methacryloyloxy)methyl phosphonic acid (hPMAPC1) and vinyl phosphonic acid (VPA) appear to be highly grafted. In all cases, diffusion of the molecules into the flax elementary fibers bulk was observed. The choice of the solvent in washing step after the irradiation step showed to be effective to control the final phosphorus content in flax fabrics. The effect of phosphorus grafting on thermal properties and fire behavior was studied using thermogravimetric analysis, pyrolysis combustion flow calorimetry and a preliminary fire test. According to the latter, self-extinguishing and non-flammable fabrics were obtained for phosphorus content of 0.5 wt% and 1.2 wt% respectively. Correlations with flammability at microscale ...
Source: Polymer Degradation and Stability - Category: Chemistry Source Type: research

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A 62-year-old woman with persistent chronic thromboembolic pulmonary hypertension (CTEPH) status after pulmonary thromboendarterectomy presented with worsening exercise capacity and continued dyspnea requiring 3 L O2 at home.  Ventilation perfusion scan (Fig 1) demonstrated A high probability of pulmonary embolism. Pulmonary angiography (Fig 2) revealed multifocal subsegmental arterial occlusions and stenoses consistent with CTEPH. Her medications included macitentan, riociguat, and selexipag for CTEPH.
Source: Journal of Vascular and Interventional Radiology : JVIR - Category: Radiology Authors: Tags: Images in IR Source Type: research
Radiation dose for coronary CT angiography (CCTA) exams can be reduced by as...Read more on AuntMinnie.comRelated Reading: 3 ways to lower CT radiation dose across the hospital Low-energy scanning methods cut CT contrast dose CT radiation dose levels vary widely, new study finds Are good intentions good enough for reducing CT dose? 3 ways to cut variability in CT radiation dose
Source: AuntMinnie.com Headlines - Category: Radiology Source Type: news
Surgical robotics is hotter than ever this year, particularly on the orthopedics side, and Zimmer Biomet is about to crank up the heat even more. The Warsaw, IN-based is expected to initiate a full launch of its Rosa Knee robotics system in the back half of the year. FDA cleared the system for use in robotically-assisted total knee replacement procedures in January, but Zimmer Biomet took a disciplined approach to commercialization. "We're going to do a limited launch out of the gate," Zimmer Biomet CEO Bryan Hanson said during a Feb. 1 earnings call. "We want to be very disciplined i...
Source: MDDI - Category: Medical Devices Authors: Tags: Business Source Type: news
This study evaluated the diagnostic performance of the ASGE guideline based on computed tomography (CT) and role of endoscopic ultrasonography (EUS) and magnetic resonance cholangiopancreatography (MRCP) in patients with suspected choledocholithiasis but negative CT finding.MethodsPatients with suspected choledocholithiasis undergoing ERCP between January 2016 and January 2017 were retrospectively analyzed. All patients underwent CT to detect choledocholithiasis. EUS or MRCP was performed when the CT scan showed negative findings. Patients were classified into the high and intermediate-risk groups, based on predictors from...
Source: Hepatobiliary and Pancreatic Diseases International - Category: Gastroenterology Source Type: research
Publication date: Available online 19 June 2019Source: Asian Journal of Pharmaceutical SciencesAuthor(s): Shah Jigar, Anroop B. Nair, Shah Hiral, Shery Jacob, Tamer M. Shehata, Mohamed Aly MorsyAbstractOral therapy of tramadol, an opiate analgesic, undergoes extensive hepatic metabolism and requires frequent administration. Transdermal therapy by virtue can overcome these issues and can improve the efficacy and reduce abuse liability of tramadol. The aim of this research was to investigate the possibility of transdermal delivery of tramadol by formulating proniosome gel and evaluate its therapeutic potential in vivo. The e...
Source: Asian Journal of Pharmaceutical Sciences - Category: Drugs & Pharmacology Source Type: research
ConclusionsUpper-bound deviation of a cropped scan may provide a clinically useful metric for scanner precision. The Aadva, 3Shape, CEREC and TDS produced scans potentially appropriate for clinical use while Planmeca and Dentalwings produced deviations greater than 0.3 mm when measuring the upper-bound deviation.
Source: Journal of Prosthodontic Research - Category: Dentistry Source Type: research
Conclusion4D heart blocks accounting for intrinsic respiratory motion and cardiac motion are greater in size than FB heart blocks. These larger blocks result from the larger contour created from the MIP image and block more dose to the heart. This technique for improving custom heart blocks can be easily implemented with 4DCT machine capabilities currently available in clinical practice.
Source: Practical Radiation Oncology - Category: Cancer & Oncology Source Type: research
Publication date: November 2019Source: Materials Science and Engineering: C, Volume 104Author(s): Sinem Diken Gür, Monireh Bakhshpour, Adil DenizliAbstractThe aim of the present study was developing a surface plasmon resonance (SPR) nanosensor to detect Escherichia coli (E. coli) for the diagnosis of urinary tract infections by using surface imprinted Au nanoparticles (AuNPs) as a recognition element. In order to realize imprinting, Cu(II) ions were used to provide interaction between E. coli cell wall and amine functionalized AuNPs forming cavities on the surface of nanosensor. E. coli surface imprinted AuNPs nanosen...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research
In this study, we designed an osteoid, biomimetic, hierarchical, porous HA ceramic 3D printed scaffold (3DPs). Further incorporation of a covalent, modular, controlled release system (CMR), based on Watson-Crick's complementary oligonucleotides, and was added to carry a bone morphogenetic protein-2 (BMP2) peptide. The choice of a HA biomimetic scaffold housing BMP2 protein fragments was selected to successfully promote osteogenesis both in vitro and in vivo. Scanning electron microscopy, micro-computed tomography analysis and computer fluid dynamics simulations of the 3DPs showed a uniform biomimetic hierarchical structure...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research
Publication date: Available online 19 June 2019Source: Neuroscience LettersAuthor(s): Kumiko Oishi, Jill Chotiyanonta, Dan Wu, Michael I. Miller, Susumu Mori, Kenichi Oishi, for the Pediatric Imaging, Neurocognition and Genetics StudyAbstractVertebrate brains commonly consist of five basic embryologic anatomical regions: telencephalon; diencephalon; mesencephalon; metencephalon; and myelencephalon. The proportions of these regions vary widely across species and developmental stages. Investigation of their growth trajectories, therefore, has the potential to provide an understanding of the substrates of inter-species variat...
Source: Neuroscience Letters - Category: Neuroscience Source Type: research
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