A pH-sensitive double [60]fullerene-end-capped polymers via ATRP: Synthesis and aggregation behavior

H. Yu; L. H. Gan; X. Hu; Y. Y. Gan

doi:10.1016/j.polymer.2007.02.050

A pH-sensitive double [60]fullerene-end-capped polymers via ATRP: Synthesis and aggregation behavior

H. Yu, L. H. Gan^*, X. Hu, Y. Y. Gan

^*Corresponding author for this work

Nanyang Technological University

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

A double [60]fullerene (C₆₀)-end-capped water-soluble polymer [C₆₀-DMAEMA₆₈-C(CH₃)₂COOCH₂]₂ was synthesized by cycloaddition of the double azido-terminated [DMAEMA₆₈-C(CH₃)₂COOCH₂]₂ with C₆₀. The well-defined [Br(Cl)-DMAEMA₆₈-C(CH₃)₂COOCH₂]₂ was first synthesized via ATRP using ethylene bis(2-bromoisobutyrate) as initiator in ethanol. TGA and spectrophotometric analyses confirmed that monoaddition to C₆₀ had occurred. In aqueous solution, [C₆₀-DMAEMA₆₈-C(CH₃)₂COOCH₂]₂ self-assembled into flower micelles. The aggregation behaviors in unbuffered distilled water and in acidic solution at pH 3 were studied by laser light scattering (LLS). The micelles formed in distilled water has an aggregation number (N_agg) of ∼242 which is about three times larger than that at pH 3 solution (N_agg = 81). However, the micellar size is bigger at pH 3, due to the highly stretched corona resulting from the charge repulsion among the protonated amino groups. After calcination, the C₆₀ core could be seen clearly by AFM. The critical micelle concentration (CMC) of [C₆₀-DMAEMA₆₈-C(CH₃)₂COOCH₂]₂ is lower in unbuffered distilled water (28.6 mg dm^-3) than in solution at pH 3 (176.8 mg dm^-3).

Original language	English
Pages (from-to)	2312-2321
Number of pages	10
Journal	Polymer
Volume	48
Issue number	8
DOIs	https://doi.org/10.1016/j.polymer.2007.02.050
Publication status	Published - Apr 5 2007
Externally published	Yes

ASJC Scopus Subject Areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

Keywords

Amphiphilic polymeric [60]fullerene
Flower micelles
Poly(DMAEMA)

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10.1016/j.polymer.2007.02.050

Cite this

@article{f9ce8196f5b74eaeac9c1f16017037d6,

title = "A pH-sensitive double [60]fullerene-end-capped polymers via ATRP: Synthesis and aggregation behavior",

abstract = "A double [60]fullerene (C60)-end-capped water-soluble polymer [C60-DMAEMA68-C(CH3)2COOCH2]2 was synthesized by cycloaddition of the double azido-terminated [DMAEMA68-C(CH3)2COOCH2]2 with C60. The well-defined [Br(Cl)-DMAEMA68-C(CH3)2COOCH2]2 was first synthesized via ATRP using ethylene bis(2-bromoisobutyrate) as initiator in ethanol. TGA and spectrophotometric analyses confirmed that monoaddition to C60 had occurred. In aqueous solution, [C60-DMAEMA68-C(CH3)2COOCH2]2 self-assembled into flower micelles. The aggregation behaviors in unbuffered distilled water and in acidic solution at pH 3 were studied by laser light scattering (LLS). The micelles formed in distilled water has an aggregation number (Nagg) of ∼242 which is about three times larger than that at pH 3 solution (Nagg = 81). However, the micellar size is bigger at pH 3, due to the highly stretched corona resulting from the charge repulsion among the protonated amino groups. After calcination, the C60 core could be seen clearly by AFM. The critical micelle concentration (CMC) of [C60-DMAEMA68-C(CH3)2COOCH2]2 is lower in unbuffered distilled water (28.6 mg dm-3) than in solution at pH 3 (176.8 mg dm-3).",

keywords = "Amphiphilic polymeric [60]fullerene, Flower micelles, Poly(DMAEMA)",

author = "H. Yu and Gan, {L. H.} and X. Hu and Gan, {Y. Y.}",

year = "2007",

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doi = "10.1016/j.polymer.2007.02.050",

language = "English",

volume = "48",

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T1 - A pH-sensitive double [60]fullerene-end-capped polymers via ATRP

T2 - Synthesis and aggregation behavior

AU - Yu, H.

AU - Gan, L. H.

AU - Hu, X.

AU - Gan, Y. Y.

PY - 2007/4/5

Y1 - 2007/4/5

N2 - A double [60]fullerene (C60)-end-capped water-soluble polymer [C60-DMAEMA68-C(CH3)2COOCH2]2 was synthesized by cycloaddition of the double azido-terminated [DMAEMA68-C(CH3)2COOCH2]2 with C60. The well-defined [Br(Cl)-DMAEMA68-C(CH3)2COOCH2]2 was first synthesized via ATRP using ethylene bis(2-bromoisobutyrate) as initiator in ethanol. TGA and spectrophotometric analyses confirmed that monoaddition to C60 had occurred. In aqueous solution, [C60-DMAEMA68-C(CH3)2COOCH2]2 self-assembled into flower micelles. The aggregation behaviors in unbuffered distilled water and in acidic solution at pH 3 were studied by laser light scattering (LLS). The micelles formed in distilled water has an aggregation number (Nagg) of ∼242 which is about three times larger than that at pH 3 solution (Nagg = 81). However, the micellar size is bigger at pH 3, due to the highly stretched corona resulting from the charge repulsion among the protonated amino groups. After calcination, the C60 core could be seen clearly by AFM. The critical micelle concentration (CMC) of [C60-DMAEMA68-C(CH3)2COOCH2]2 is lower in unbuffered distilled water (28.6 mg dm-3) than in solution at pH 3 (176.8 mg dm-3).

AB - A double [60]fullerene (C60)-end-capped water-soluble polymer [C60-DMAEMA68-C(CH3)2COOCH2]2 was synthesized by cycloaddition of the double azido-terminated [DMAEMA68-C(CH3)2COOCH2]2 with C60. The well-defined [Br(Cl)-DMAEMA68-C(CH3)2COOCH2]2 was first synthesized via ATRP using ethylene bis(2-bromoisobutyrate) as initiator in ethanol. TGA and spectrophotometric analyses confirmed that monoaddition to C60 had occurred. In aqueous solution, [C60-DMAEMA68-C(CH3)2COOCH2]2 self-assembled into flower micelles. The aggregation behaviors in unbuffered distilled water and in acidic solution at pH 3 were studied by laser light scattering (LLS). The micelles formed in distilled water has an aggregation number (Nagg) of ∼242 which is about three times larger than that at pH 3 solution (Nagg = 81). However, the micellar size is bigger at pH 3, due to the highly stretched corona resulting from the charge repulsion among the protonated amino groups. After calcination, the C60 core could be seen clearly by AFM. The critical micelle concentration (CMC) of [C60-DMAEMA68-C(CH3)2COOCH2]2 is lower in unbuffered distilled water (28.6 mg dm-3) than in solution at pH 3 (176.8 mg dm-3).

KW - Amphiphilic polymeric [60]fullerene

KW - Flower micelles

KW - Poly(DMAEMA)

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A pH-sensitive double [60]fullerene-end-capped polymers via ATRP: Synthesis and aggregation behavior

Abstract

ASJC Scopus Subject Areas

Keywords

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