BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Drupal iCal API//EN
X-WR-CALNAME:Events items teaser
X-WR-TIMEZONE:America/Toronto
BEGIN:VTIMEZONE
TZID:America/Toronto
X-LIC-LOCATION:America/Toronto
BEGIN:DAYLIGHT
TZNAME:EDT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
DTSTART:20250309T070000
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:EST
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
DTSTART:20251102T060000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
UID:69f74433d9b17
DTSTART;TZID=America/Toronto:20251208T120000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20251208T130000
URL:https://uwaterloo.ca/chemical-engineering/events/masc-oral-examrecovery
 -and-reuse-nanomaterials-radically
LOCATION:E6 - Engineering 6 Room 2022 200 University Ave West Waterloo ON N
 2L 3G1 Canada
SUMMARY:MASc Oral Exam\\Recovery and Reuse of Nanomaterials from Radically\
 nPolymerizable Thermoset Nanocomposites\; Towards A Circular Economy by\nZ
 ahra Rezaei
CLASS:PUBLIC
DESCRIPTION:The widespread adoption of thermoset nanocomposites has created
 \nsignificant end-of-life management challenges due to their permanent\ncr
 osslinked networks\, which resist conventional recycling methods and\ntrap
  valuable nanomaterials within non-degradable matrices. This work\npresent
 s a proof-of-concept study to assess a new approach for\nachieving a circu
 lar economy for thermoset nanocomposites\; recovering\nand reusing nanomat
 erials from thermoset nanocomposites through the\nincorporation of cleavab
 le comonomers into the polymer matrix\,\nenabling controlled matrix degrad
 ation and nanofiller recovery at\nend-of-life.\n\nCarbon nanotubes (CNTs) 
 were selected as the nanofiller for this study\ndue to their widespread us
 e in nanocomposites and growing industrial\nsignificance\, and a styrene/d
 ivinylbenzene (DVB) thermoset matrix was\nchosen as a model matrix for its
  chemical compatibility with CNTs. To\nenable controlled degradation at en
 d-of-life and nanofiller recovery\,\ncomonomer additives that can install 
 cleavable bonds into the\nmatrix’s polymer network were systematically e
 valuated. Several\ncandidates were investigated\, including cyclic ketene 
 acetal (CKA)\n(specifically 2-methylene-1\,3-dioxepane\, MDO)\, which unde
 rwent\nhydrolysis too rapidly and an unwanted ring-retaining side reaction
 \nfor practical application\, and thionolactones (specifically\ndibenzo[c\
 ,e]-oxepine-5(7H)-thione\, DOT and\n2-(isopropylthio)dibenzo[c\,e]oxepine-
 5(7H)-thione\, 2SiPrDOT)\, which\nwas limited by the monomers’ solubilit
 y in the styrene/DVB system.\nThrough this careful screening process\, 2Si
 PrDOT was selected as the\nmost suitable option\, offering both chemical s
 tability during\nprocessing and sufficient solubility in the system.
DTSTAMP:20260503T124851Z
END:VEVENT
END:VCALENDAR