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.
Results
Showing 1 to 13 of 13 for “"Tacticity"”.
-
Dipole moments and Kerr effect of poly(n-vinylcarbazole) and its complexes with trinitrofluorenone
… measurements and powder x-ray diffraction. The tacticity of the polymer samples was determined using proton and carbon-13 nuclear magnetic resonance spectroscopy. Measurements of their static dielectric permittivity and electro-optical birefringence (Kerr effect) in solution in 1,4-dioxane were …
-
Controlling the Stereoregularity of Polyacrylonitrile and Its Determination Using Small-Molecule Host Inclusion Compounds
… polyacrylonitrile (PAN) and determining its tacticity (predominantly isotactic or syndiotactic), utilizing guest monomer (acrylonitrile = AN) host inclusion polymerization. Highly stereoregular PAN, with a meso or racemic diad content ~ 80%, was prepared by γ-ray irradiation of an AN urea …
-
Studies in the anionic polymerization of methyl methacrylate
… weight, molecular weight distribution and tacticity. In addition, a second monomer addition test was carried out to verify that the polymerization was truly a living one, and a kinetic study was attempted. Studies to investigate the effect of changing the order of addition of reagents …
-
Engineering approaches to control polymer architecture
… polymer molecular weight, composition, topology, tacticity, and temporal and spatial patterning. However, my work has sought to approach polymer synthesis with hybrid solutions of the latest research in chemistry with the fundamentals of engineering like automation, fluid mechanics, and reactor …
-
Z-selective olefin metathesis processes and Cis/syndioselective ROMP with high oxidation state molybdenum alkylidenes
… affords >98% cis, >98% tactic polyDCMNBD. The tacticity of this polymer is proved to be syndiotactic through polymerization of DCMenthNBD (2,3-dicarbomenthoxynorbomadiene) and IH- H COSY. A variety of related MAP alkylidene compounds are also investigated towards the ROMP of DCMNBD and found to …
-
Equilíbrio de fases de soluções polidispersas de polímeros
… average molar mass and not of the degree of tacticity. The model can be easily extended to alow for description of other polydisperse polymer solutions.
-
Dielectric studies of novel polymeric systems
… of the bulkiness of the substituent and the tacticity on the a and ß transitions. The ß transition associated with side chain rotations was only observed in the case of the methyl and ethyl substituents. The Havriliak-Negami data analysis was used to evaluate the breadth and the skewness of …
-
Dielectric and Kerr Effect Studies of Electro-Active Polymer Complexes
… Kerr effect was found to vary with changes in tacticity for the range of molecular weights and molecular weight distributions considered in this study.
-
Versatile Strategies for Multifunctional Polyolefins
… To do this, input variables such as the monomer, tacticity, molar mass, and molar mass distribution are controlled in an organized manner to affect output properties such as crystallinity, elasticity, and tensile strength. The ability to create diverse plastics is necessary for the functions asked …
-
Development of Controlled Ring-Opening Polymerization of O-Carboxyanhydrides
… allowing precise control of polyester's tacticity and sequence (Chapter 5). An overview future work has been summarized (Chapter 6).
-
Interfacial cationic polymerization and its application in microencapsulation
… practically promising, but interesting signs of tacticity were observed. GMA polymer provided a rubbery porous layer for which further investigation is warranted. The permeability of C1 ploymer layer (0.8% wlw of the total formulation and thickness of 0.11 um to KCI (very water soluble drug) was …
-
A phenomenological mathematical modelling framework for the degradation of bioresorbable composites
… affecting composite degradation such as polymer tacticity or ceramic impurities. The analysis of the case studies also highlighted that the ceramic dissolution rate needed to depict the portrayed degradation behaviours is significantly higher than that reported for ceramics alone in dissolution …
-
Carbohydrate Mediation of Aqueous Polymerizations: Cyclodextrin Mediation of Aqueous Polymerizations of Methacrylates
… and bulk polymerizations indicated that the tacticity of the polymers produced in both cases were identical. The bulk polymers were also used in the preparation of carbohydrate/methacrylic blends with potential applications in the areas of selective barriers, biodegradable films. Inclusion of …