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A thermosensitive poly(organophosphazene) gel

Title
A thermosensitive poly(organophosphazene) gel
Authors
Lee B.H.Lee Y.M.Sohn Y.S.Song S.-C.
Ewha Authors
손연수
SCOPUS Author ID
손연수scopus
Issue Date
2002
Journal Title
Macromolecules
ISSN
0024-9297JCR Link
Citation
vol. 35, no. 10, pp. 3876 - 3879
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Thermosensitive poly(organophosphazenes) bearing α-amino-ω-methoxy-PEG (AMPEG) and hydrophobic L-isoleucine ethyl ester (IleOEt) as side groups have been synthesized, and their reversible sol-gel properties were investigated by means of 31P NMR spectroscopy and viscometer. In an aqueous solution, the poly(organophosphazenes) exhibited four-phase transitions with temperature gradually increasing: a transparent sol, a transparent gel, a opaque gel, and a turbid sol. The gelation properties of the polymer were affected by several factors such as the composition of substituents, the chain length of AMPEG, and the concentration of the polymer solutions. The more hydrophilic composition of the polymers offers the higher gelation temperature. The gelation of the polymer is presumed to be attributed to the hydrophobic interaction between the side-chain fragments (-CH(CH 3)CH 2CH 3) of IleOEt which act as the physical junction in the polymer aqueous solution.
DOI
10.1021/ma012093q
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자연과학대학 > 화학·나노과학전공 > Journal papers
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