Details

Autor(en) / Beteiligte

• Yuan, J-J
• Ma, R
• Li, X-Q
• Zhuang, K
• Cheng, S-Y
• Jiang, L
• Feng, L-X
• Fan, Z-Q

Titel

ROD-LIKE AGGREGATES FROM POLYSTYRENE-b-POLY(4-VINYLPYRIDINE)-b-POLYSTYRENE TRIBLOCK COPOLYMER IN AQUEOUS MEDIA

Ist Teil von

• Chinese journal of polymer science, 2004, Vol.22 (1), p.17-23

Ort / Verlag

College of Chemistry & Materials Sciences, Hubei University, Wuhan 430062, China%Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China%Institute of Polymer Science, Zhejiang University, Hangzhou 310027, China

Erscheinungsjahr

2004

Beschreibungen/Notizen

• The rod-like assembly from BAB block copolymer with hydrophilic middle block A in aqueous solution was described. The copolymer used is polystyrene (PS)39-b-poly(4-vinylpyridine)(P4VP)98-b-PS39 (the subscripts are the average polymerization degree of corresponding blocks) triblock copolymer with Mw/Mn = 1.15. The aggregates were characterized by transmission electron microscopy and atomic force microscopy. The dependence of rod-like aggregate formation on solvents, pH, and polymer concentrations was investigated. The rod-like aggregates were formed when using dioxane as initial solvent, while spherical micelles were formed using DMF. Elevating pH values from 4 to 5 to 7 and decreasing initial copolymer concentrations from 1.5 wt% to 1.0 wt% to 0.5 wt% were favorable for the formation of well-defined rod-like aggregates. In addition, the bicontinuous rods and lamellae were observed when preparing colloid solutions in appropriate conditions.