ICCAS OpenIR
Synthesis and Thermo-/pH- Dual Responsive Properties of Poly(amidoamine) Dendronized Poly(2-hydroxyethyl) Methacrylate
Gao, Min1; Jia, Xinru1; Li, Yan1; Liang, Dehai1; Wei, Yen2
2010-05-11
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume43Issue:9Pages:4314-4323
AbstractThe first and second generation poly(amidoamine) dendronized poly(2-hydroxylethyl) methacrylate (PGn-macro (n = 1, 2)) were synthesized by the macromonomer approach. The structures and molecular weights of the obtained polymers were characterized by (1)H NM R. FTIR, and GPC. UV-vis turbidity measurements revealed that all the resultant polymers were thermo-responsive, exhibiting the LCSTs in the range of 16-33 degrees C. The polymers also showed pH sensitive for the existence of the tertiary amino groups in the interior of the pendent dendrons. It was found that the generation of the dendrons, the molecular weights of the polymers, the concentrations, and the pi-is showed great influence on the lower critical solution temperatures (LCSTs) of the polymer solutions. The higher LCST could be achieved either by increasing the generation of the dendrons or by decreasing the molecular weight. The dilute polymer solution with lower pH displayed the higher LCST. For example, the LCST of PG I-macro solution increased significantly with the pH decreased below 7.0, but the decrease of LCST was much slower at pH >= 7.0. DLS experiments at variable temperatures demonstrated that the polymer chains spontaneously aggregated to form large size particles as increasing the temperature above LCST due to the dehydration of the peripheral butylamide groups and the enhanced hydrophobic interactions. The morphology of aggregates was directly visualized by optical microscopy, and uniform spherical aggregates with the diameter of 3-7 mu m were observed.
DOI10.1021/ma1000783
Indexed BySCI
Language英语
WOS IDWOS:000277274200041
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:30[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/70090
Collection中国科学院化学研究所
Corresponding AuthorJia, Xinru
Affiliation1.Peking Univ, Coll Chem & Mol Engn, Minist Educ,Beijing Natl Lab Mol Sci, Key Lab Polymer Chem & Phys, Beijing 100871, Peoples R China
2.Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China
Recommended Citation
GB/T 7714
Gao, Min,Jia, Xinru,Li, Yan,et al. Synthesis and Thermo-/pH- Dual Responsive Properties of Poly(amidoamine) Dendronized Poly(2-hydroxyethyl) Methacrylate[J]. MACROMOLECULES,2010,43(9):4314-4323.
APA Gao, Min,Jia, Xinru,Li, Yan,Liang, Dehai,&Wei, Yen.(2010).Synthesis and Thermo-/pH- Dual Responsive Properties of Poly(amidoamine) Dendronized Poly(2-hydroxyethyl) Methacrylate.MACROMOLECULES,43(9),4314-4323.
MLA Gao, Min,et al."Synthesis and Thermo-/pH- Dual Responsive Properties of Poly(amidoamine) Dendronized Poly(2-hydroxyethyl) Methacrylate".MACROMOLECULES 43.9(2010):4314-4323.
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