Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 58 for “"plasticizers"”.
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The modification of polymeric materials with plasticizers or elastomers
The modification of polymeric materials using plasticizers or elastomers has been investigated in three research programs. The first describes epoxy resins modified with dimethylsiloxane, dimethyl-co-methyltrifluoropropyl siloxane, and dimethyl-co-diphenyl siloxane. The apparent compatibility …
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Effects of plasticizers on extrusion of PVC: an experimental & numerical study
Plasticizers are often interchanged with the idea that they will not affect the processing behavior of Polyvinyl Chloride (PVC). However, when the plasticizer type is changed, various complaints are made by the processors that the material no longer processes the same. This research was concerned …
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Do Elevated Levels of Glutathione Decrease the Toxicity of Plasticizers in Mouse Liver Cells?
Phthalates are esters of phthalic acid that play a crucial role in the manufacturing industries for enhancing the properties of plastic materials. Di-(2-ethylhexyl) phthalate (DEHP) is one of the most common phthalates used in a variety of products including food packaging and medical equipment. …
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Establishing the Conditions for Stable Extrusion of Melt Spun Polyacrylonitrile with Water Based Plasticizers
… is able to be stable melt spun with water based plasticizers. More specifically, PAN/water/acetonitrile (70/15/15) mixture is considered as reference sample in this study because it was proposed in a BASF patent in which it was claimed it could be stably melt spun. We are looking for a more …
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Development of an inline cleaning procedure and a concentration method for analyzing low levels of organophosphate flame retardants and plasticizers in sediment
"To minimize the background contamination of organophosphate flame retardants and plasticizes (OPFPs) during sediment analysis, an inline cleaning procedure was developed to clean materials (extraction cell, glass fiber filters, diatomic earth, and aluminum oxide) involved in sediment extraction …
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Synthesis and evaluation of novel polymer modifiers for biodegradable polymers
The effects of ester plasticizers and copolymers on the mechanical properties of the natural biodegradable polymers, poly(3-hydroxybutyrate) [PHB] and poly(lactic acid) [PLA] have been studied after subjecting to melt processing conditions. Ester plasticizers were synthesized from citric, tartaric …
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A thermal/thermo-mechanical and imaging study of component distribution and interaction in pharmaceutical film coats
… properties of EC films incorporated with various plasticizers and pore forming agents, hence to understand the drug release mechanisms in relation to the physical characteristics of EC films. The thermal properties of EC powder and EC films were initially characterized by means of …
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Polyolefin plastomers in composites for flooring applications
… PVC-based formulations must be processed with plasticizers, which have recently raised some concerns from a sustainability point of view. In the research work reported here, calcium carbonate-filled formulations based on polyolefin plastomers, POP, are prepared in a laboratory-scale mixer, and …
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Developing green processes for the conversion of biobased materials into pyrones
… synthetic applications are corrosion inhibitors, plasticizers, and block copolymers. Triacetic Acid Lactone (TAL) is a bio-based molecule fermented from Saccharmyces cerevisiae. In the first chapter, we discuss the conversion of triacetic acid lactone to corrosion inhibitors. The synthesis …
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The attempted plasticization of cellulose from cellulose xanthate
… seemed to remove the plasticizer. Some of the plasticizers were soluble in alkaline solutions and in the dissolving out of the salts, the dissolved salts caused high causticity, thus removing the plasticizer also. The acid-treated samples (A) and (C) required from three to four hours to …
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Evaluation of the Odor Compounds Sensed by Explosive-Detecting Canines
… (or less) volatile substances, solvents, and plasticizers. Headspace (HS) and solid phase microextraction (SPME) coupled with gas chromatography/mass spectrometry (GC/MS) were used to determine what chemical compounds are contained within the headspace of an explosive as well as NESTT …
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Assessment of a marine polysaccharide for use as excipient in pharmaceutical hot-melt extrusion
… by extrusion using water and Eudragit EPO as plasticizers, and Diphenhydramine Hydrochloride and Clotrimazoleas as active pharmaceutical ingredients is assessed. The amount of residual water in the extrudates is determined by thermogravimetric analysis. The thermal transitions of the …
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Synthesis and Characterization of Linear and Branched Polylactic Acid for Use in Food Packaging Applications
… has been made at forming films utilizing various plasticizers and surfactants as well as polyvinyl alcohol as dispersing agents. A cold dispersion procedure realized the most success, as a 15% PLA waterborne formulation was achieved. Standard test methods show a high degree of grease resistance …
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Comparative evolution of mipafox-induced delayed neuropathy in the rat and hen
… life, including use as pesticides, industrial plasticizers and chemical warfare agents. Exposure to certain organophosphates produces a delayed degeneration of the longest and largest nerve fibers, including those of the ascending and descending tracts of the spinal cord, a condition termed …
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The analysis of rocket propellants by carbon-13 NMR
… (aliphatic nitrate esters, carboranes, plasticizers and stabilizers) are reported.
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Non-Covalent Interactions in Polymeric Materials: From Ionomers to Polymer Blends
… (Arg:LA), have been demonstrated as effective plasticizers for poly(vinyl alcohol) (PVOH) films. The plasticization effects on the properties of PVOH films were evidenced by lower crystallizability and improved film ductility. In addition, ChCl:MA deep eutectic solvent was more effective in …
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I. Solubility and blend studies of nitrocellulose II. Relaxation properties of thin film coatings: the role of surface topography
… were used to guide the selection of suitable plasticizers for nitrocellulose films. Subsequent dynamic mechanical experiments were then used to evaluate the effectiveness of the blend formulations in broadening the glass transition dispersion of the nitrocellulose blended films; in addition, …
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Plasticized lignin-PVC blends for flooring
… based on the investigation into the use of plasticizers for reducing the degree of association existing within lignin, macromolecules, The mechanical and thermal properties, as well as the processibility of the obtained materials are tested. As a result of the present study, an alternative …
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Synthesis and Characterization of Solution and Melt Processible Poly(acrylonitrile-co-methylacrylate) statistical copolymers
… alternative melt processing route several benign plasticizers have been investigated. A low temperature, persulfate-metabisulfite initiated emulsion copolymerization was developed to synthesize poly(acrylonitrile-co-methyl acrylate) copolymers with acrylonitrile contents between 91-96 wt% with a …
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