Preparation and characterization of thermoplastic water-borne polycarbonate-based polyurethane dispersions and cast films

2015 ◽  
Vol 132 (42) ◽  
pp. n/a-n/a ◽  
Author(s):  
Magdalena Serkis ◽  
Rafał Poręba ◽  
Jiří Hodan ◽  
Jana Kredatusová ◽  
Milena Špírková
Keyword(s):  
Cast Films ◽  
Polyurethane Dispersions ◽  
Water Borne

Synthesis and characterization of water-borne crosslinked silylated polyurethane dispersions

2005 ◽  
Vol 98 (2) ◽  
pp. 620-631 ◽  
Author(s):  
S. Subramani ◽  
J. M. Lee ◽  
I. W. Cheong ◽  
J. H. Kim
Keyword(s):  
Synthesis And Characterization ◽  
Polyurethane Dispersions ◽  
Water Borne

Characterization of Sulfur-Cured Styrene-Butadiene Copolymer Rubbers and Their Polybutadiene Blends

1970 ◽  
Vol 43 (6) ◽  
pp. 1332-1339 ◽  
Author(s):  
J. K. Clark ◽  
R. A. Scott
Keyword(s):  
Carbon Disulfide ◽  
High Speed ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Absorption Bands ◽  
Rubber Blends ◽  
Cast Films ◽  
Micro Structures ◽  
Styrene Butadiene

Abstract Dissolution of sulfur-cured, carbon black-loaded copolymers and their blends with cis-1,4-polybutadiene (PBD) are brought about by boiling with o-dichlorobenzene which contains a small amount of 2,2′-dibenzamidodiphenyl disulfide. The resulting slurries are subjected to a sequence of separations which include high-speed centrifugation to remove solids, and solvent precipitation followed by filtration to isolate the precipitates. The precipitates are washed with solvent to remove soluble organic materials followed by carbon disulfide washing to dissolve the polymers. Cast films of the polymers are obtained by evaporating the carbon disulfide washings onto sodium chloride discs. The infrared spectra of the cast films of these preparations are very similar to those of their respective polymers prior to loading and curing. Calculations for relative concentrations of bound styrene and PBD micro-structures permit nominal identification of the kinds of styrene-butadiene rubber and the amounts of cis-1,4-PBD used in a cured rubber formulation. Absorption bands used are near 3.35 μ for cis-1,4-PBD, 6.65 μ for bound styrene, 10.35 μ for trans-1,4-PBD; and 11.0 μ for vinyl-1,2-PBD. Efforts are being made to improve the data by using a grating infrared instrument and also to extend the calibrations to include other rubber blends.

scholarly journals Corrigendum to “Characterization of the efficiency and uncertainty of skimmed milk flocculation for the simultaneous concentration and quantification of water-borne viruses, bacteria and protozoa” [J. Microbiol. Methods 134 (2017) 46–53]

2017 ◽  
Vol 142 ◽  
pp. 96 ◽  
Author(s):  
Eloy Gonzales-Gustavson ◽  
Yexenia Cárdenas-Youngs ◽  
Miquel Calvo ◽  
Marcelle Figueira Marques da Silva ◽  
Ayalkibet Hundesa ◽  
...  
Keyword(s):  
Skimmed Milk ◽  
Water Borne

Isolation and Structural Characterization of Two Water-Borne Pheromones from Euplotes crassus, a Ciliate Commonly Known to Carry Membrane-Bound Pheromones

2011 ◽  
Vol 58 (3) ◽  
pp. 234-241 ◽  
Author(s):  
CLAUDIO ALIMENTI ◽  
ADRIANA VALLESI ◽  
SERGIO FEDERICI ◽  
GRAZIANO DI GIUSEPPE ◽  
DINI FERNANDO ◽  
...  
Keyword(s):  
Structural Characterization ◽  
Euplotes Crassus ◽  
Membrane Bound ◽  
Water Borne

scholarly journals Combination of Coagulation, Adsorption, and Ultrafiltration Processes for Organic Matter Removal from Peat Water

2021 ◽  
Vol 14 (1) ◽  
pp. 370
Author(s):  
Muthia Elma ◽  
Amalia Enggar Pratiwi ◽  
Aulia Rahma ◽  
Erdina Lulu Atika Rampun ◽  
Mahmud Mahmud ◽  
...  
Keyword(s):  
Organic Matter ◽  
Activated Carbon ◽  
Natural Organic Matter ◽  
Membrane Fouling ◽  
Aluminum Sulfate ◽  
Adsorption Process ◽  
Powdered Activated Carbon ◽  
Organic Matter Removal ◽  
Water Borne

The high content of natural organic matter (NOM) is one of the challenging characteristics of peat water. It is also highly contaminated and contributes to some water-borne diseases. Before being used for potable purposes, peat water must undergo a series of treatments, particularly for NOM removal. This study investigated the effect of coagulation using aluminum sulfate coagulant and adsorption using powdered activated carbon (PAC) as a pretreatment of ultrafiltration (UF) for removal of NOM from actual peat water. After preparation and characterization of polysulfone (Psf)-based membrane, the system’s performance was evaluated using actual peat water, particularly on NOM removal and the UF performances. The coagulation and adsorption tests were done under variable dosings. Results show that pretreatment through coagulation–adsorption successfully removed most of the NOM. As such, the UF fouling propensity of the pretreated peat water was substantially lowered. The optimum aluminum sulfate dosing of 175 mg/L as the first pretreatment stage removed up to 75–78% NOM. Further treatment using the PAC-based adsorption process further increased 92–96% NOM removals at an optimum PAC dosing of 120 mg/L. The final UF-PSf treatment reached NOM removals of 95% with high filtration fluxes of up to 92.4 L/(m2.h). The combination of three treatment stages showed enhanced UF performance thanks to partial pre-removal of NOM that otherwise might cause severe membrane fouling.

scholarly journals Chemical and Application Properties of Some Solvent and Water Based Coatings on Wooden Substrate

2019 ◽  
Vol 70 (2) ◽  
pp. 107-114
Author(s):  
Shikhar Shukla ◽  
Krishna K. Pandey ◽  
Kishan Kumar V. S.
Keyword(s):  
Chemical Characterization ◽  
Wood Products ◽  
Organic Coatings ◽  
Aesthetic Value ◽  
Wood Coatings ◽  
Volatile Organic ◽  
Water Based ◽  
The Aesthetic ◽  
Water Borne

Wood finishes are used extensively to improve the aesthetic value and protect wood products from moisture. These organic coatings generally contain volatile organic compounds (VOC) as solvents that evaporate when the coatings cure over the surface. Due to strict legislations against these hazardous VOCs, the buyers across the globe are shifting towards products finished with water borne coats. Two of the most commonly used wood coatings in India are polyurethane and nitrocellulose (NC) lacquer. This paper aims at comparing these two wood coatings with their water borne counterparts. The study was conducted on the wood substrate of Melia dubia. Chemical characterization of the cured coats was attempted through FTIR spectroscopy. Physical appearances in terms of gloss and film thickness were also studied. Bands of urethane, urea and nitric groups were identified, which helped in understanding the changes in chemical structure of the finishes after curing. The thickness of the organic coatings was significantly higher than that of their water-borne counterparts. Gloss of water based coatings was observed to be lesser than that of their organic solvent based counterparts in either coating material. In case of lacquer, the reduction was up-to 33 %. whereas in case of PU, gloss dropped down by about 54 %.

scholarly journals Behavioral Characterization of Attractin, a Water-Borne Peptide Pheromone in the Genus Aplysia

2003 ◽  
Vol 205 (1) ◽  
pp. 16-25 ◽  
Author(s):  
Sherry D. Painter ◽  
Bret Clough ◽  
Sara Black ◽  
Gregg T. Nagle
Keyword(s):  
Peptide Pheromone ◽  
Behavioral Characterization ◽  
Water Borne
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