Molecular reorganization of rod-coil diblock copolymers at the air-water   interface

doi:10.1021/la060844h

CORC > 北京大学 > 化学与分子工程学院

	Molecular reorganization of rod-coil diblock copolymers at the air-water interface
	Zhang, Jie ; Cao, Hongqing ; Wan, Xinhua ; Zhou, Qifeng
刊名	langmuir
	2006
关键词	PEO BLOCK-COPOLYMERS LANGMUIR-BLODGETT MONOLAYERS POLY(ETHYLENE OXIDE) AIR/WATER INTERFACE SURFACE FILM AGGREGATION MICELLES BEHAVIOR PHASE
DOI	10.1021/la060844h
英文摘要	Amphiphilic rod-coil diblock copolymers consisting of flexible poly( ethylene oxide) (PEO) and rodlike poly {(+)2,5- bis[ 4'-((S)-2-methylbutoxy)phenyl]styrene} (PMBPS) with predominant hydrophobic contents formed ordered monolayers at the air-water interface. The structures of monolayers transferred to a mica substrate at different surface pressures by the Langmuir-Blodgett method were investigated by atom force microscopy (AFM). For PEO104-b-PMBPS17 copolymer (the subscripts denote the number-averaged polymerization degree of each block), a complete spectrum of molecular reorganization at variable surface pressures was observed. Spherical surface aggregates of LB monolayers were spontaneously formed during the solvent evaporation after the deposition of polymer solution. Continuous compression led to the pancake-to-brush conformation transition of the copolymer that PEO chains desorbed from the air-water interface and went into the water subphase. The effective content of the rod block changed continuously from 61% at zero pressure to 93% at the start of the monolayer collapse, igniting the molecular reorganization. As a result, coalescence of individual spherical aggregates into long cylindrical aggregates with an increase of the surface pressure was observed. For a series of block copolymers PEO104-b-PMBPSm (m = 17, 30, 45, 53), as the rod contents increased from 61% to 83%, the morphological transition from spherical aggregates to long cylindrical aggregates in orientational order developed at zero pressure, which showed a similar dependence on the effective contents of the rod block to PEO104-b-PMBPS17 at different pressures. In comparison to coil-coil block copolymers PEO-b-PS, the rod-coil block copolymers PEO-b-PMBPS exhibited distinct structure reorganization behavior, in which the orientation of rod block might play an important role.; Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary; SCI(E); EI; PubMed; 35; ARTICLE; 15; 6587-6592; 22
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/198790]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Zhang, Jie,Cao, Hongqing,Wan, Xinhua,et al. Molecular reorganization of rod-coil diblock copolymers at the air-water interface[J]. langmuir,2006.
APA	Zhang, Jie,Cao, Hongqing,Wan, Xinhua,&Zhou, Qifeng.(2006).Molecular reorganization of rod-coil diblock copolymers at the air-water interface.langmuir.
MLA	Zhang, Jie,et al."Molecular reorganization of rod-coil diblock copolymers at the air-water interface".langmuir (2006).