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Thermo- and pH-Responsive Dendronized Copolymers of Styrene and Maleic Anhydride Pendant with Poly(amidoamine) Dendrons as Side Groups
Gao, Min1; Jia, Xinru1; Kuang, Guichao1; Li, Yan1; Liang, Dehai1; Wei, Yen2
2009-06-23
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume42Issue:12Pages:4273-4281
AbstractA series of thermo- and pH-dual responsive dendronized polymers PSADG1-PSADG3 were successfully synthesized by attaching butylamide terminated poly(amidoamine) dendrons (DG1-DG3) to the alternating copolymers of styrene (St) and maleic anhydride (MAh). The structures and the molecular weights of the obtained polymers were characterized by (1)H NMR and FTIR. The coverage degrees of DG(1)-DG(3) dendrons were 83.5%, 64.9%, and 60.5%, respectively, indicating that the numbers of the attaching dendrons decreased in the order of G1 > G2 > G3. The turbidity measurements revealed that all the dendronized polymers exhibited reversible thermo-responsive property in deionized water, and the LCST values increased from PSADG1 to PSADG3 due to both the coverage degree and the structure of dendrons. Moreover, these dendronized polymers were sensitive to pH oil account of the carboxylic and tertiary amino groups in the architecture. It hits been found that, for example, the PSADG2 did not display thermal sensitivity in acidic environment (pH 2.4), whereas the phase transition occurred in near neutral (pH 6.0) and basic conditions (pH 10.6) with the LCST of 33.1 and 49.0 degrees C, respectively. It was also found that, at pH 6.0, the polymers formed larger aggregates with R(h,app) of ca. 0.6 mu m at elevated temperatures mainly because of the dehydration and the enhanced hydrophobic interactions. The morphology of the aggregates was monitored by optical microscopy, and uniform spherical aggregates with it diameter of 5-10 mu m were observed above the LCST.
DOI10.1021/ma900085j
Indexed BySCI
Language英语
WOS IDWOS:000267048200064
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:61[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/66300
Collection中国科学院化学研究所
Corresponding AuthorJia, Xinru
Affiliation1.Peking Univ, Beijing Natl Lab Mol Sci, Key Lab Polymer Chem & Phys, Coll Chem & Mol Engn,Minist Educ, Beijing 100871, Peoples R China
2.Drexel Univ, Dept Chem, Philadelphia, PA 19104 USA
Recommended Citation
GB/T 7714
Gao, Min,Jia, Xinru,Kuang, Guichao,et al. Thermo- and pH-Responsive Dendronized Copolymers of Styrene and Maleic Anhydride Pendant with Poly(amidoamine) Dendrons as Side Groups[J]. MACROMOLECULES,2009,42(12):4273-4281.
APA Gao, Min,Jia, Xinru,Kuang, Guichao,Li, Yan,Liang, Dehai,&Wei, Yen.(2009).Thermo- and pH-Responsive Dendronized Copolymers of Styrene and Maleic Anhydride Pendant with Poly(amidoamine) Dendrons as Side Groups.MACROMOLECULES,42(12),4273-4281.
MLA Gao, Min,et al."Thermo- and pH-Responsive Dendronized Copolymers of Styrene and Maleic Anhydride Pendant with Poly(amidoamine) Dendrons as Side Groups".MACROMOLECULES 42.12(2009):4273-4281.
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