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 239 for “"Propylene"”.
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Rate of hydration of propylene
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1940.
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Rhodium-zeolite hydroformylation of propylene
… the rhodium exchanged NaX and NaY zeolites as propylene hydroformylation catalysts. Catalytic activity was measured in a differential bed reactor. Flow in situ infrared spectroscopy was used to probe the coordination chemistry of the zeolite modified rhodium carbonyls. The catalytic activity of …
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Improvement of propylene yield via butene metathesis
There is an increasing interest in finding ways to produce on-purpose propene, due to the significant predicted propene growth in the next few years without the concomitant growth in the ethene demand, One of the technologies available is 1-butene metathesis, which describes a one-step process …
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Gas-Phase Epoxidation of Ethylene and Propylene
… supports are active for the formation of propylene oxide by the oxidation of propylene with hydrogen and oxygen mixtures. This study investigates the effect of cyanide treatment on gold supported on titanosilicate zeolite supports (Au/TS-1). Catalysts treated with weak solutions of sodium …
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Structure-property relationships in poly-(propylene-ethylene) copolymers
… and the mechanical properties of poly-(propylene-ethylene) bi-phasic copolymers. The copolymers investigated covered a comonomer content ranging between 4 and 23 percent ethylene. Nine grades were considered, with variables such as the melt flow index, the degree of crystallinity, the …
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A study of poly(propylene) by gas permeation.
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1968.
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A study of miscibility, morphology, crystallization and melting behavior of isotactic poly(propylene) in blends of poly(propylene) and poly(1-butene)
… the miscibility behavior of blends of polypropylene (PP) and poly(l-butene) (PB1) will be reexamined. The driving force for this study is the fact that contradictory conclusions on this subject exist in the literature. In this thesis, the glass transition behavior, morphology, spherulite …
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Liquid Crystalline Copper(II) Complexes of Poly(propylene imine) Dendrimers
… 3,4-decyloxybenzoyl-functionalized poly(propylene imine) PPI dendrimers from 1st to 5th generation as ligands and copper(II) as paramagnetic centres have been synthesised. The dendrimeric complexes were prepared by coordination of copper(II) to the corresponding ligands. The maximum …
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Electrochemical Synthesis of Propylene Oxide With Alternating and Direct Current
Electro-organic processes typically contain complex reaction sequences which couple the heterogeneous electrode reactions with an extended homogeneous reaction pathway. An experimental - theoretical approach was applied to understand the coupled diffusion-reaction processes and establish general …
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Synthesis and characterization of poly(propylene oxide) and its copolymers
The synthesis of molecularly designed poly(propylene oxide) was accomplished by using aluminum porphyrin initiator/catalysts to prepare controlled molecular weights, narrow molecular weight distributions, topologies, and functionalities. Poly(propylene oxide) has been an important intermediate in …
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Morphology, Crystallization and Melting Behavior of Propylene-Ethylene Statistical Copolymers
… and melting behavior of novel Dow Chemical propylene-ethylene copolymers were investigated. The incorporation of ethylene units into a polypropylene chain resulted in the decrease in crystallization, melting and glass transition temperatures and overall crystallinity. Based on the shape of …
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Catalytic oxidation of ethylene and propylene in a solid electrolyte cell
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1982.
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Kinetics of propylene disproportionation over a tungsten oxide on silica catalyst
… consisted of a study of the kinetics of propylene disproportionation over a tungsten oxide on silica catalyst. A catalyst of ten percent WO₃ on silica gel (223 square meters per gram B.E.T. surface area) was used in a microcatalytic reactor. Electron probe scans of the commercially …
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Polymer Stabilized Magnetite Nanoparticles and Poly(propylene oxide) Modified Styrene-Dimethacrylate Networks
Magnetic nanoparticles that display high saturation magnetization and high magnetic susceptibility are of great interest for medical applications. Nanomagnetite is particularly desirable because it displays strong ferrimagnetic behavior, and is less sensitive to oxidation than magnetic transition …
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Study of the Morphology and Optical Properties of Propylene/Ethylene Copolymer Films
… has resulted in the production of isotactic polypropylene and propylene/ethylene copolymers with a unique defect and comonomer distribution. This work investigated the morphology and optical properties of cast and compression molded films made from the homopolymer and copolymers with up to 20 …
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Electrochemical impedance modelling of the reactivities of dendrimeric poly(propylene imine) DNA nanobiosensors
… electrochemical studies of three dendrimeric polypropylene imine (PPI) nanomaterials and their applications as a platform in the development of a novel label free DNA nanobiosensor based on electrochemical impedance spectroscopy. Cyclic voltammetry (CV), differentia pulse voltammetry (DPV), square …
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Structure property behavior of an ethylene-propylene-diene ionic terpolymer containing zinc stearate
The structure property behavior of an ethylene-propylenediene ionic terpolymer containing varying amounts of ZnSt was investigated. Studies show that ZnSt acts as a reinforcing filler under ambient conditions. Stress-strain behavior, percent relaxation, hysteresis and permanent set were all found …
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Break-in behavior of a tungsten oxide on silica catalyst during propylene disproportionation
… of a tungsten oxide on silica catalyst during propylene disproportionation. A catalyst of 10 percent WO3 on silica gel (223 square meters per gram B.E.T. surface area) was used in a microcatalytic reactor. During the initial contacting of freshly activated samples of this catalyst with …
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