Block copolymers by transformation of "living" carbocationic into "living" radical polymerization. II. ABA-type block copolymers comprising rubbery polyisobutene middle segment

Journal of Polymer Science, Part A: Polymer Chemistry

Volumn 35, Issue 16, 1997, Pages 3595-3601

  Coca, Simion ^a   Matyjaszewski, Krzysztof ^a  

^a CARNEGIE MELLON UNIVERSITY   (United States)

Author keywords

ABA type block copolymers; Controlled "living"; Polyisobutene; Polystyrene; Radical polymerization

Indexed keywords

CATIONIC POLYMERIZATION; FREE RADICAL POLYMERIZATION; INITIATORS (CHEMICAL); POLYBUTENES; POLYMETHYL METHACRYLATES; POLYSTYRENES;

LIVING CARBOCATIONIC POLYMERIZATION; LIVING RADICAL POLYMERIZATION; POLYISOBUTENE;

BLOCK COPOLYMERS;

EID: 0031276357     PISSN: 0887624X     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1099-0518(19971130)35:16<3595::AID-POLA27>3.0.CO;2-9     Document Type: Article

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25. n,exp values were determined by size exclusion chromatography calibrated using linear polystyrene standards.
26. o is the molecular weight of monomer.
27. General procedure for the homogeneous ATRP of styrene, (meth)acrylate: the following reagents were weighed in an appropriate amount into a glass tube under an ambient atmosphere: CuCl, dNbipy, monomer, toluene, macroinitiator. Two "freeze-pump-thaw" cycles were performed to ensure that oxygen was removed from the polymerization solution. Each tube was sealed under vacuum. The tubes were placed in an oil bath thermostated at 100°C. After 12 h the tubes were removed from the oil bath and cooled at 0°C to quench the polymerization. Afterwards, the individual tubes were broken and the contents were dissolved in 7 mL of THF. Percent conversion of each samples was measured using gas chromatography, molecular weights and polydispersities were measured using size exclusion chromatography.