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URN: urn:nbn:de:swb:90-464233

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

Zugehörige Institution(en) am KIT Institut für Biologische Grenzflächen (IBG)
Institut für Baugestaltung (Inst. f. Baugest.)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2014
Sprache Englisch
Identifikator ISSN: 1759-9954
KITopen ID: 1000046423
HGF-Programm 43.14.01; LK 01
Erschienen in Polymer Chemistry
Band 5
Heft 17
Seiten 5009-5019
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