TY - JOUR
T1 - Characterization of a 4-miktoarm star copolymer of the (PS- b -PI) 3 PS type by temperature gradient interaction chromatography
AU - Cho, Donghyun
AU - Park, Soojin
AU - Chang, Taihyun
AU - Avgeropoulos, Apostolos
AU - Hadjichristidis, Nikos
N1 - Funding Information:
TC acknowledges the support from KOSEF (Center for Integrated Molecular Systems) and the BK21 program. NH thanks the Ministry of Education (Educational Program “Polymer Sciences and its Applications”) for financial support.
PY - 2003/11
Y1 - 2003/11
N2 - Temperature gradient interaction chromatography (TGIC) was applied for the separation of a complex miktoarm star copolymer which has one polystyrene (PS) arm and three polystyrene-b-polyisoprene (PS-b-PI) diblock copolymer arms. Such miktoarm star polymers are much more difficult to characterize than branched homopolymers since the byproduct, typically polymers with missing arm(s) or coupled products, have not only different molecular weights but also different compositions. TGIC was able to fully separate the byproducts, and the composition of the molecular species corresponding to the different separated elution peaks was determined by two methods, fractionation/NMR and multiple detection (UV and RI). A reasonable agreement between the results of the two methods was obtained. By using the composition found, the corresponding molecular weights were determined by multi-angle light scattering detection. Based on the composition and the molecular weight we were able to identify the structure of the different molecular species.
AB - Temperature gradient interaction chromatography (TGIC) was applied for the separation of a complex miktoarm star copolymer which has one polystyrene (PS) arm and three polystyrene-b-polyisoprene (PS-b-PI) diblock copolymer arms. Such miktoarm star polymers are much more difficult to characterize than branched homopolymers since the byproduct, typically polymers with missing arm(s) or coupled products, have not only different molecular weights but also different compositions. TGIC was able to fully separate the byproducts, and the composition of the molecular species corresponding to the different separated elution peaks was determined by two methods, fractionation/NMR and multiple detection (UV and RI). A reasonable agreement between the results of the two methods was obtained. By using the composition found, the corresponding molecular weights were determined by multi-angle light scattering detection. Based on the composition and the molecular weight we were able to identify the structure of the different molecular species.
KW - 4-Miktoarm star copolymer
KW - Multiple detection
KW - Temperature gradient interaction chromatography
UR - http://www.scopus.com/inward/record.url?scp=0141530910&partnerID=8YFLogxK
U2 - 10.1016/S0014-3057(03)00154-X
DO - 10.1016/S0014-3057(03)00154-X
M3 - Article
AN - SCOPUS:0141530910
SN - 0014-3057
VL - 39
SP - 2155
EP - 2160
JO - European Polymer Journal
JF - European Polymer Journal
IS - 11
ER -