INSIGHTS INTO THE CURE CHEMISTRY OF BROMINATED BUTYL RUBBER

Autor:	J. Scott Parent, Michael A. J. Faba, Sagar J. Tipnis, Kevin Kulbaba, Ralph A. Whitney
Rok vydání:	2019
Předmět:	chemistry.chemical_compound Polymers and Plastics chemistry Rheometry Materials Chemistry Organic chemistry 02 engineering and technology Butyl rubber 010402 general chemistry 021001 nanoscience & nanotechnology 0210 nano-technology 01 natural sciences 0104 chemical sciences
Zdroj:	Rubber Chemistry and Technology. 92:350-363
ISSN:	1943-4804 0035-9475
DOI:	10.5254/rct.19.82572
Popis:	The importance of dehydrobromination to the cure chemistry of brominated butyl rubber (BIIR) is demonstrated through a combination of cure rheometry studies and model compound experiments. These data show that, while HBr elimination to give an exomethylene conjugated diene is inevitable, subsequent reactivity is highly sensitive to acidity within the mixture. As a result, formulations containing acid scavengers such as epoxides or MgO produce cure dynamics and yields that differ markedly from those of unstabilized analogues. These differences in allyl cation reaction pathways underlie much of the known behavior of BIIR + ZnO compounds and have a substantial effect on the progress of sulfur-based cure formulations. In this report, allyl cation fragmentation and electrophilic addition mechanisms are developed from 1H nuclear magnetic resonance (NMR) and mass spectrometry analysis of model compounds, and their implications for sulfur, ZnO, and sulfur + ZnO vulcanization chemistry are detailed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::50103e41e245506c95b077c342f70892 https://doi.org/10.5254/rct.19.82572 Zobrazit plný text záznamu