ICCAS OpenIR
Aggregation-induced microgelation: a new approach to prepare gels in solution
Yang, Xuyan; Tong, Yin-Yin; Li, Zi-Chen1; Liang, Dehai
2011
Source PublicationSOFT MATTER
ISSN1744-683X
Volume7Issue:3Pages:978-985
AbstractUsing poly(vinyl alcohol)-b-poly(N-isopropylacrylamide) (PVA-b-PNIPAm) as an example, we demonstrate the concept of aggregation-induced gelation of PVA in dilute solution. PVA-b-PNIPAm forms aggregates in dilute solution at temperature above the transition point of PNIPAm, which significantly increases the local concentration of PVA chains. Therefore, PVA chains have a better chance to crystallize or to generate small crystalline nuclei, which function as cross-linkers in the later stages. When the solution is cooled to room temperature, PVA-b-PNIPAm gradually forms microgels at the time scale of days. We further investigated the effects of block ratio, heating rate, and urea concentration on the gelation process. It is found that larger PVA ratio, longer aging time and less urea content facilitated the gel formation. Rheological measurement at semidilute concentration also confirms gel formation after the heating/cooling treatment. The aggregation-induced gelation offers a new approach to prepare PVA gels without the introduction of toxic chemical cross-linkers.
DOI10.1039/c0sm00257g
Indexed BySCI
Language英语
WOS IDWOS:000286615500026
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/72018
Collection中国科学院化学研究所
Corresponding AuthorLi, Zi-Chen
Affiliation1.Peking Univ, Beijing Natl Lab Mol Sci, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
2.Peking Univ, Key Lab Polymer Chem & Phys, Coll Chem & Mol Engn, Minist Educ, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Yang, Xuyan,Tong, Yin-Yin,Li, Zi-Chen,et al. Aggregation-induced microgelation: a new approach to prepare gels in solution[J]. SOFT MATTER,2011,7(3):978-985.
APA Yang, Xuyan,Tong, Yin-Yin,Li, Zi-Chen,&Liang, Dehai.(2011).Aggregation-induced microgelation: a new approach to prepare gels in solution.SOFT MATTER,7(3),978-985.
MLA Yang, Xuyan,et al."Aggregation-induced microgelation: a new approach to prepare gels in solution".SOFT MATTER 7.3(2011):978-985.
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