Reactive processing of polyolefins : a study on polymers and model compounds
(2012)
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- (en) This dissertation discloses how N-bromosuccinimide mediates the grafting of maleic anhydride onto isotactic polypropylene, providing highly-grafted stereoblock polypropylene elastomers with preserved molecular weights. The grafts structure was identified as isolated succinic rings distributed all along the polymer chains whereas small anhydride oligomers grafted almost exclusively at chain extremities are usually observed with common grafting processes. On the contrary, it was also observed that N-bromosuccinimide had almost no effect on the grafting mechanism of maleic anhydride onto high-density polyethylene. Several attempts were made to substitute bromine radicals in the grafting reaction by other mediating species borrowed from controlled radical polymerization techniques. A five-unit oligomer of propylene, 2,4,6,8,10-pentamethylundecane, was also synthesized and the corresponding diastereoisomers were isolated as model compounds of polypropylene of various tacticities. Three side-projects involving either the materials or skills developed in this thesis are also presented.
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Drooghaag, X. (2012). Reactive processing of polyolefins : a study on polymers and model compounds. https://hdl.handle.net/2078.5/163340