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Analysis of the Impact on the Mechanical Properties of Modification of Oligohydroxyethers in Organic Solvent Solution with Rubbers.
Polymers (Basel)
February 2021
Department of Technology and Automation, Czestochowa University of Technology, 42-201 Czestochowa, Poland.
This paper proposes and presents the chemical modification of linear hydroxyethers (LHE) with different molecular weights (380, 640, and 1830 g/mol) with the addition of three types of rubbers (polysulfide rubber (PSR), polychloroprene rubber (PCR), and styrene-butadiene rubber (SBR)). The main purpose of choosing this type of modification and the materials used was the possibility to use it in industrial settings. The modification process was conducted for a very wide range of modifier additions (rubber) per 100 g LHE.
View Article and Find Full Text PDFPartitioning of dissolved organic matter-bound mercury between a hydrophobic surface and polysulfide-rubber polymer.
Water Res
November 2011
Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305-4020, USA.
This study investigated the role of dissolved organic matter on mercury partitioning between a hydrophobic surface (polyethylene, PE) and a reduced sulfur-rich surface (polysulfide rubber, PSR). Comparative sorption studies employed polyethylene and polyethylene coated with PSR for reactions with DOM-bound mercuric ions. These studies revealed that PSR enhanced the Hg-DOM removal from water when DOM was Suwannee River natural organic matter (NOM), fulvic acid (FA), or humic acid (HA), while the same amount of 1,3-propanedithiol-bound mercuric ion was removed by both PE and PSR-PE.
View Article and Find Full Text PDFImmobilization of Hg(II) in water with polysulfide-rubber (PSR) polymer-coated activated carbon.
Water Res
January 2011
Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305-4020, USA.
An effective mercury removal method using polymer-coated activated carbon was studied for possible use in water treatment. In order to increase the affinity of activated carbon for mercury, a sulfur-rich compound, polysulfide-rubber (PSR) polymer, was effectively coated onto the activated carbon. The polymer was synthesized by condensation polymerization between sodium tetrasulfide and 1,2-dichloroethane in water.
View Article and Find Full Text PDFOccipitocervical instrumentation in the pediatric population using a custom loop construct: initial results and long-term follow-up experience.
J Neurosurg Pediatr
March 2010
Department of Neurosurgery, University of Utah, Primary Children's Medical Center, Salt Lake City, Utah 84113, USA
Object: Rigid occipitocervical instrumentation for craniovertebral instability is gaining widespread acceptance for use in pediatric patients; however, most of the instrumentation has been modified from adult-sized hardware. The Wasatch loop system (formerly the Avery-Brockmeyer-Thiokol loop system) is a rigid occipitocervical fixation device designed specifically for use in children. It affixes to the occiput and incorporates either C1-2 transarticular screws or C-2 pars screws.
View Article and Find Full Text PDFInstallation of a multiplexed Raman system in a chemical process.
Appl Spectrosc
December 2004
ATK Elkton LLC, 55 Thiokol Road, Elkton, Maryland 21921, USA.
A 785 nm laser dispersive Raman system was installed in a hazardous chemical production plant to monitor two reactors, a still, and a holding tank with measurement directly through sight glasses. Compositional information for several raw materials, intermediates, and products was obtained using partial least squares (PLS) calibrations. Discriminate analysis was used to exclude extremely poor spectra while including usable ones.
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