Polypropylene Thermosets by Functional Nitroxyl-Mediated Radical Crosslinking
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Authors
Ozols, Kyle
Date
Type
thesis
Language
eng
Keyword
Peroxide initiated crosslinking , Functional nitroxyl , Polypropylene
Alternative Title
Abstract
New chemistry for preparing polypropylene (PP) thermosets is described, wherein radical degradation suffered during conventional peroxide treatment is overcome using a nitroxyl additive bearing a polymerizable functional group. A small amount of 4-vinylbenzoic-2,2,6,6-tetramethylpiperidin-N-oxyl (VBTEMPO) is used to trap peroxide-derived, alkyl radical intermediates during the early stages of the modification process, yielding a macromonomer derivative in situ that crosslinks in the later stages through side-chain oligomerization. This process has proven capable of producing thermosets with gel contents in excess of 90%, while providing the induction period needed to shape the formulation before it rendered thermoset. Control over PP crosslinking dynamics and yields have been gained by appropriate selection of peroxide initiator, polymerizable functional structure, and additional cure formulation components. The thesis concludes with preliminary assessments of the stability of PP-derived alkoxyamines, and their potential to confer oxidative stability to a thermoset.
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Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada
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Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.
ProQuest PhD and Master's Theses International Dissemination Agreement
Intellectual Property Guidelines at Queen's University
Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.