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Artigo Revisado por pares
BIBTEX RIS

Water‐proton relaxivity of hyperbranched polymers carrying TEMPO radicals

2009; Wiley; Volume: 47; Issue: 3 Linguagem: Inglês

10.1002/mrc.2384

ISSN

1097-458X

Autores

Hiroyuki Hayashi, Satoru Karasawa, Akihiro Tanaka, Keisuke Odoi, Katsumi Chikama, Hideto Kuribayashi, Noboru Koga,

Tópico(s)

Conducting polymers and applications

Resumo

Abstract High water‐soluble hyperbranched poly(styrene) (HPS) polymers carrying stable 2, 2, 6, 6‐tetramethylpiperidine‐1‐oxyl (TEMPO) radicals, HPS‐N‐TEMPO, HPS‐Im‐TEMPO, and HPS‐Im‐(TEMPO) 2 , were prepared in ca. 60% introducing yield. HPS‐N‐TEMPO and HPS‐Im‐TEMPO were determined to be nearly spherical shapes of the diameter of 2.4 ± 0.6 and 2.2 ± 0.6 nm, respectively, by transmission electron microscope (TEM) images. The values of water‐proton relaxivity, r 1 , at 25 MHz, 0.59 T, and 25 °C were 6.0, 5.2, and 14 mM −1 sec −1 for HPS‐N‐TEMPO, HPS‐Im‐TEMPO, and HPS‐Im‐(TEMPO) 2 , respectively. The spin‐lattice relaxation time ( T 1 )‐weighted images in phantom were also observed. Copyright © 2009 John Wiley & Sons, Ltd.

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