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Stability of star-shaped RAFT polystyrenes under mechanical and thermal stress

Altintas, Ozcan; Abbasi, Mahdi; Riazi, Kamran; Goldmann, Anja S.; Dingenouts, Nico; Wilhelm, Manfred; Barner-Kowollik, Christopher

Well-defined three-arm and four-arm star polymers designed via a Z-group approach carrying trithiocarbonate functionalities at the core are prepared via reversible addition-fragmentation chain transfer (RAFT) polymerization featuring molecular weights of Mn{,}SEC = 156 kDa{,} D = 1.16 (3-arm) and Mn{,}SEC = 162 kDa{,} D = 1.15 (4-arm) based on multi-angle laser light scattering (MALLS) detection{,} respectively. The star-shaped polystyrenes are subjected (in bulk) to thermal stress in the temperature range between 140 and 200 [degree]C from 10 minutes up to 96 h. The thermally treated 3-arm and 4-arm star polymers are analyzed via size exclusion chromatography (SEC) to quantify the degradation process at variable temperatures as a function of time under an argon atmosphere. Cleavage rate coefficients of the star polymers are deduced as a function of temperature{,} resulting in activation parameters for the cleavage process{,} i.e. Ea = 131 kJ mol-1; A = 3.93 [times] 1011 s-1 (Mn{,}SEC = 156 kDa{,} D = 1.16{,} 3-arm star) and Ea{,} = 134 kJ mol-1; A = 9.13 [times] 1011 s-1 (Mn{,}SEC = 162 kDa{,} D = 1.15{,} 4-arm star){,} respectivel ... mehr

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DOI: 10.5445/IR/1000046423
DOI: 10.1039/C4PY00484A
Zitationen: 10
Web of Science
Zitationen: 9
Zugehörige Institution(en) am KIT Institut für Baugestaltung (Inst. f. Baugest.)
Institut für Technische Chemie und Polymerchemie (ITCP)
Institut für Biologische Grenzflächen (IBG)
Publikationstyp Zeitschriftenaufsatz
Jahr 2014
Sprache Englisch
Identifikator ISSN: 1759-9954
KITopen-ID: 1000046423
HGF-Programm 43.14.01 (POF II, LK 01)
Erschienen in Polymer Chemistry
Band 5
Heft 17
Seiten 5009-5019
Bemerkung zur Veröffentlichung RSC geförderter Open Access-Artikel
Nachgewiesen in Web of Science
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