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Showing 1 to 20 of 1444 for “"Polymerization."”.
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Organometallic Polymerization Catalysts
A study has been made of the polymerization of styrene initiated by vanadium-based Ziegler-Natta catalysts, the most active of which was formed from VOC1₃/A1Et1.5Cl1.5 and was the most active also for the copolymerization of ethylene and propylene. A dilatometric study of the polymerization, using …
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Living cationic polymerization
The kinetics of the polymerization of styrene iniated by 1-chloro-1-phenyltehane/tin (IV) chloride in the presence of tetrabutylammonium chloride have been studied. Dilatometry studies at 25 °C were conducted and the orders of reaction were established. Molecular weight studies were conducted for …
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DIFFUSION CONTROLLED VINYL POLYMERIZATION
<p>It is well known that the polymerization rate and the molecular weight distribution of vinyl polymers can change markedly during the course of polymerization and that these changes are due to the influence of self-diffusion upon the termination reaction. This phenomenon is commonly referred to …
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Polymerization in Confined Space
Polymerization of acrylamide in confined space was studied. The system used for the polymerization was a colloid of water/SDS/dodecane/pentanol. The colloidal was stable through the polymerization process only at specific compositions. The system revealed a lamellar water structure which housed the …
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Modeling polymerization-based amplification
… acts as a Type II photoinitiator of free radical polymerizations when used in combination with alcohols or amines as co-initiators. Previous work utilizing eosin in polymerizations focused on high concentrations of initiators but it has recently been gaining use in bio-applications at lower …
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Spatially-Directed Interfacial Polymerization
… This thesis introduces In Situ Interfacial Polymerization (ISIP) and Interfacial Photopolymerization (IPP), two room-temperature, interfacial polymerization (IP)-based methods for rapid manufacturing of polymers and their composites. First, In Situ Interfacial Polymerization (ISIP) is …
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Emulsion Polymerization Using Switchable Surfactants
… CO2-triggered switchable surfactants in emulsion polymerization of hydrophobic and hydrophilic monomers. Bicarbonate salts of the following compounds were employed as surfactants in the emulsion polymerization of styrene, methyl methacrylate (MMA) and/or butyl methacrylate (BMA): …
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Polymerization in emulsion microdroplet reactors
… as chemical reactors for execution of complex polymerization chemistries to develop unique and functional particle materials. Emulsions are dispersions of immiscible fluids where one fluid usually exists in the form of drops. Not surprisingly, if a liquid-to-solid chemical reaction proceeds to …
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Living cationic polymerization of isobutene
The polymerization of isobutene initiated by 1-chloro-1-phenylethane has been investigated, and molecular weight studies conducted using size exclusion chromatography. Polymerizations carried out in a 40/60 (v/v) mixture of dichloromethaneIcyclohexane, using titanium (IV) chloride as a catalyst in …
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The synthesis and polymerization of dicycloproparenes
… in tetrahydrofuran.* The silver catalyzed polymerization of each dicycloproparene was investigated. The dimers 5a and 5b were observed and isolated at an early stage during the polymerization of dicycloproparene 1.* The ladder polymer formed by treating the linearly fused …
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Towards understanding RAFT aqueous heterophase polymerization
… technique for studying the aqueous heterophase polymerization. The polymerization rates obtained by calorimetric investigation of ab initio emulsion polymerization of styrene revealed the strong influence of the type and combination of the RAFT agent and initiator on the polymerization rate and …
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Polymerization of bromoundecylacrylate and alkylating methylimidazole
<p>Polymerized ionic liquids (PIL) generally are solids, but a few examples have been reported that also exhibit liquidity in the neighborhood of room temperature called liquid polymerized ionic liquids (LPIL). The development of a platform suitable for exploring LPIL properties based on the …
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Mathematical modelling in batch emulsion polymerization
Emulsion polymerisation, suspension polymerisation and the dispersion processes of styrene in water have been carried out at 50°C in a stainless steel, stirred batch reactor of 3.63 dam capacity. The reactor was fitted with a temperature control facility and could be operated with or without …
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Living cationic polymerization of styrene monomers
… of synthesis of polystyrene under various polymerization conditions such as solvent polarity, temperature, initial concentrations of initiator, catalyst, monomer and added salts or co-catalyst, which was achieved using the living cationic polymerization technology in conjunction with gel …
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Block co-polymerization by transformation reactions
… use the transformation of anionic to metathesis polymerization to produce block co-polymers of styrene-b-pentenylene using WC16 /PStLi and WC16/PStLi/ AlEtC12 catalyst systems. Analysis of the products using SEC and 1H and 13C NMR spectroscopy enabled mechanisms for metathesis initiation …
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