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 12 of 12 for “"Homopolymerisation"”.
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Ni(II) and Pd(II) based catalysts for α-olefin polymerisation
… catalysts have been synthesised and used in homopolymerisation of ethylene and 1-hexene at room temperature.
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Polymerisation of vinyl monomers in continuous-flow reactors. An experimental study, which includes digital computer modelling, of the homopolymerisation of styrene and methylmethacrylate by anionic and free radical mechanisms respectively in continuous flow-stirred-tank reactors.
An introduction is given to the background theory and scientific literature of the major subject areas of interest in this thesis, namely the chemistry of free radical and anionic polymerisation, molecular weight control in each type of polymerisation, polymerisation reactors, computer simulation …
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Reactive processing of polyolefins using antioxidant systems
… to be mainly due to competing reactions such as homopolymerisation of the antioxidant. At high concentrations of peroxide, higher binding efficiency resulted, but, this was accompanied by melt degradation of the polymer. In a special reactive processing procedure, a di- or a trifunctional …
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The Development and Evaluation of Novel Techniques for the Study of Polymerisation and Degradation Reactions
… are presented showing how the more promising homopolymerisation systems based on cyclic dienes can be utilised in cross linking reactions. Section II describes the development and application of equipment, incorporating some novel features, for use in thermal degradation studies of polymers. …
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Studies of the cationic polymerisation of vinylic and energetic cyclic ether monomers
… dinitrate (BODN), has been prepared and its homopolymerisation and copolymerisation with GL YN studied. In concurrent work the carbocationic polymerisations of isobutylene or substituted styrenes have been studied. Materials with narrow molecular weight distributions have been prepared using …
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Atom transfer radical polymerisation - towards the synthesis of a fully-functional photorefractive polymer
… sulphoxide solution was studied. Although homopolymerisation yielded only oligomers, copolymerisation of this monomer with methyl methacrylate was found to be readily achievable. Keywords: ATRP, Styrene; Methyl methacrylate; Polar solvents; Fully-functional photorefractive polymer. 2
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Synthesis and characterisation of vinyl block copolymers
… solvents, in the presence of aluminium alkyls, homopolymerisation of methyl methacrylate showed characteristics of a living polymerisation. An investigation of the effects of the structures of the lithium and aluminium alkyls on the efficiency of initiation showed that a …
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Compatibilisation of heterogeneous polymer blends by reactive processing
… reaction of AA takes place simultaneously with homopolymerisation of the monomers, melt degradation and crosslinking reactions of the polymers. The extent of these competing reactions were inferred from measurements of melt flow index and insoluble gel content. Through a judicious use of both …
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Functionalisation of polymers: reactive processing, structure and performance characteristics
… scission with very little extent of monomer homopolymerisation taking place. The results showed that the grafting degree was increased with increasing GMA and MA concentrations. It was also found that T-101 was a suitable peroxide to initiate the grafting reaction of these monomers on NR and …
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The role of stable nitroxyl radical precursors as antioxidants in polyolefins
… backbone was inevitably in competition with homopolymerisation of the monomers as well as melt degradation of the polymer and other side reactions. As previously reported, binding efficiency of bisacrylic nitroxyl precursor was maximum due to formation of unextractable homopolymer of the …
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Reactive processing methods for functionalisation of polymers and in-situ compatibilisation of poly(ethylene terephthalate)-based blends
… concentration. However, grafting was low and the homopolymerisation of GMA and crosslinking of the polymers were identified as the main side reactions competing with the desired grafting reaction for EP and EPDM, respectively. The use of the tri-functional comonomer, TRlS, was shown to greatly …
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Synthese von einkernigen und mehrkernigen Übergangsmetall-Komplexen als Katalysatoren für die Ethenpolymerisation und die Ethen/1-Hexen-Copolymerisation
… zu erhalten. In der Ethen-Homopolymerisation sowie in der Ethen/1-Hexen-Copolymerisation erzielten diese Komplexe gute Aktivitäten. Es konnte gezeigt werden, dass sich die in der Copolymerisation erhaltenen Polymere in ihren Eigenschaften von den aus der Ethenpolymerisation …