Synthesis and Kinetic Studies on Palladium Hydride-Initiated Vinyl Polymerisation of Functionalised Norbornenes

Synthesis and Kinetic Studies on Palladium Hydride-Initiated Vinyl Polymerisation of Functionalised Norbornenes
Author: Lynn Donlon
Publisher:
Total Pages:
Release: 2011
Genre: Vinyl polymers
ISBN:

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Chapter I provides a summary of the vinyl polymerisation of norbornenes and their functionalised derivatives, using palladium-based initiators. The concept of photolithography is introduced along with discussion of hexafluoropropanol-(HFP) functionalised norbornene derivatives that provide the basis for the work described in this thesis. In Chapter II, the synthesis of a series of HFP-functionalised monomers of the type NB(CH2)nC(CF3)2OH (n = 1-2) and NB(CH2)nOCH2C(CF3)2OH (n = 0-6) is described. The monomers prepared differ in the number of methylene units (n) separating the HFP-functionality from the norbornene skeleton, which has previously been shown to have an influence upon polymerisation rate. The series of palladium hydride initiator complexes [Pd(H)(MeCN)(PCy3)2][X] (anion X = BF4, PF6, SbF6, I and B(C6F5)4) were also prepared with a view to determining the effect of the anion on polymerisation rate. The in-depth study of the stability and reactivity of the discrete complex [PdH(MeCN)(PCy3)2][B(C6F5)4] (Pd1388) is examined in Chapter III. The complex Pd1388 is shown to decompose in chlorinated solvents at 70?C to form PdCl2(PCy3)2 and two further species, b and c that, despite extensive efforts, could not be identified. Both Pd1388 itself and Pd1388 in its decomposed form (i.e. the mixture of PdCl2(PCy3)2, b and c) are able to act as pro-initiator systems in the polymerisation of exo-NBCH2OCH2C(CF3)2OH (SX1). The kinetics of these polymerisation reactions are explored in detail and a kinetic model is proposed, which accurately describes the overall observed polymerisation rate. In Chapter IV the kinetic model was extended to the study of pure exo- and pure endo-HFP-functionalised norbornenes, with the model proving to be an excellent fit to experimental data for monomer consumption. An increase in the value of n is shown to produce a corresponding enhancement of polymerisation rate. An examination of the polymerisation of HFP-functionalised norbornenes using GPC as function of time is also described. High molecular weight material is formed at low conversion (

Membrane Materials for Gas and Separation

Membrane Materials for Gas and Separation
Author: Yuri Yampolskii
Publisher: John Wiley & Sons
Total Pages: 440
Release: 2017-01-10
Genre: Technology & Engineering
ISBN: 1119112737

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Si containing polymers have been instrumental in the development of membrane gas separation practices since the early 1970s. Their function is to provide a selective barrier for different molecular species, where selection takes place either on the basis of size or on the basis of physical interactions or both. Combines membrane science, organosilicon chemistry, polymer science, materials science, and physical chemistry Only book to consider polymerization chemistry and synthesis of Si-containing polymers (both glassy and rubbery), and their role as membrane materials Membrane operations present environmental benefits such as reduced waste, and recovered/recycled valuable raw materials that are currently lost to fuel or to flares

Advances in Organometallic Chemistry

Advances in Organometallic Chemistry
Author: Pedro J. Perez
Publisher: Academic Press
Total Pages: 316
Release: 2014-09-25
Genre: Science
ISBN: 0128010843

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This book contains authoritative reviews regarding the field of Organometallic Chemistry, written by highly qualified experts within the area, and reviewed by other experts before publication. Because of this high standard, AOC is one of the most cited journals in both Organic and Inorganic Chemistry fields. High quality of the articles Expertise of authors Careful editing that provides an easy-to-read material