TY - JOUR
T1 - Syntheses of amphiphilic diblock copolymers containing a conjugated block and their self-assembling properties
AU - Wang, Hengbin
AU - Hau Wang, H.
AU - Urban, Volker S.
AU - Littrell, Kenneth C.
AU - Thiyagarajan, P.
AU - Yu, Luping
PY - 2000/7/26
Y1 - 2000/7/26
N2 - An efficient approach to the syntheses of amphiphilic rod - coil diblock and coil - rod - coil triblock copolymers was developed. Each diblock copolymer consists of a perfectly monodispersed oligo(phenylene vinylene) covalently bonded to a poly(ethylene glycol) block with a very low polydispersity (< 1.05). The structure and basic physical properties of these copolymers were characterized by various spectroscopic techniques such as NMR, MALDI-TOF, GPC, DSC, UV/vis, and the fluorescence study. These diblock copolymers were shown to possess remarkable self-assembling abilities, and long cylindrical micelles (>1 μm) were formed. TEM, SANS, and AFM studies showed that the core of the micelles has a diameter of ~8-10 nm and was composed of an OPV block. TEM and SANS studies revealed that these OPV-PEG micelles have a cylindrical OPV core surrounded by a PEG corona. Cryo-TEM and SANS studies indicate that fibers were formed even in very dilute THF/H2O solutions. Since the conjugated OPV blocks exhibit liquid crystallinity and electric and optical properties, these micelles are interesting for studying the electroactive effect in a nanometer scale.
AB - An efficient approach to the syntheses of amphiphilic rod - coil diblock and coil - rod - coil triblock copolymers was developed. Each diblock copolymer consists of a perfectly monodispersed oligo(phenylene vinylene) covalently bonded to a poly(ethylene glycol) block with a very low polydispersity (< 1.05). The structure and basic physical properties of these copolymers were characterized by various spectroscopic techniques such as NMR, MALDI-TOF, GPC, DSC, UV/vis, and the fluorescence study. These diblock copolymers were shown to possess remarkable self-assembling abilities, and long cylindrical micelles (>1 μm) were formed. TEM, SANS, and AFM studies showed that the core of the micelles has a diameter of ~8-10 nm and was composed of an OPV block. TEM and SANS studies revealed that these OPV-PEG micelles have a cylindrical OPV core surrounded by a PEG corona. Cryo-TEM and SANS studies indicate that fibers were formed even in very dilute THF/H2O solutions. Since the conjugated OPV blocks exhibit liquid crystallinity and electric and optical properties, these micelles are interesting for studying the electroactive effect in a nanometer scale.
UR - http://www.scopus.com/inward/record.url?scp=0034718092&partnerID=8YFLogxK
U2 - 10.1021/ja0010812
DO - 10.1021/ja0010812
M3 - Article
AN - SCOPUS:0034718092
SN - 0002-7863
VL - 122
SP - 6855
EP - 6861
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 29
ER -