ICCAS OpenIR
Association and aggregation behavior of poly(ethylene oxide)-b-poly (N-isopropylacrylamide) in aqueous solution
Yan, Jingjing1,2; Ji, Wenxi1,2; Chen, Erqiang1,2; Li, Zichen1,2; Liang, Dehai1,2
2008-07-08
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume41Issue:13Pages:4908-4913
AbstractThe well-defined block copolymer of poly(ethylene oxide)-b-poly(N-isopropylacrylamide) (PEO-b-PNIPAm) was synthesized by the reversible addition fragmentation transfer (RAFT) polymerization, and its thermo-induced aggregation process in dilute aqueous solution was studied by laser light scattering. At temperatures below the cloud point of PNIPAm, the PEO-b-PNIPAm chains were associated together to form large and loose structures, which were in a fast equilibrium with the single chains. The association was weakened with increasing concentration, which was against the common ideas about aggregation. Because of such "abnormal" behavior, PEO-b-PNIPAm underwent three stages of transformation during the heating process at 0.1 mg/mL: the disassociation of loose associates at temperatures below 28 degrees C, the micellization above 42 degrees C, and the aggregation in between. At each stage; the size and M-w,M-app exhibited distinct features. On the basis of these observations, possible mechanisms of the association and aggregation were also proposed.
DOI10.1021/ma7026726
Indexed BySCI
Language英语
WOS IDWOS:000257366200053
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:87[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/64076
Collection中国科学院化学研究所
Corresponding AuthorLiang, Dehai
Affiliation1.Peking Univ, Coll Chem & Mol Engn, Minist Educ, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China
2.Peking Univ, Coll Chem & Mol Engn, Minist Educ, Key Lab Polymer Chem & Phys, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Yan, Jingjing,Ji, Wenxi,Chen, Erqiang,et al. Association and aggregation behavior of poly(ethylene oxide)-b-poly (N-isopropylacrylamide) in aqueous solution[J]. MACROMOLECULES,2008,41(13):4908-4913.
APA Yan, Jingjing,Ji, Wenxi,Chen, Erqiang,Li, Zichen,&Liang, Dehai.(2008).Association and aggregation behavior of poly(ethylene oxide)-b-poly (N-isopropylacrylamide) in aqueous solution.MACROMOLECULES,41(13),4908-4913.
MLA Yan, Jingjing,et al."Association and aggregation behavior of poly(ethylene oxide)-b-poly (N-isopropylacrylamide) in aqueous solution".MACROMOLECULES 41.13(2008):4908-4913.
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