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Citation: Shi Xiang-Yang, Wu Shi-Kang. A Study on the Micellar Polarity of Hydrophobic Poly(N-isopropylacrylmides)[J]. Acta Physico-Chimica Sinica, ;1999, 15(02): 127-132. doi: 10.3866/PKU.WHXB19990207 shu

A Study on the Micellar Polarity of Hydrophobic Poly(N-isopropylacrylmides)

1.
Institute of Photographic Chemistry,Chinese Acdemy of Sciences,Beijing 100101

Received Date: 17 March 1998
Available Online: 15 February 1999

The parameters of solvent polarity (π) and hydrogen bond donor ability(α) of a series of different hydrophobically modified poly (N-isopropylacrylamides)(PNIPAM ) micelles have been studied using the Kamlet-Taft solvatochrom comparson method,on the basis of the determination of the relationship between two probe s maximum wavenumber in fluorescence spectrum and solviatochromic parameters of different solvents. Results show that, at the same molar feed ratio ,the micellar environments of solubilized probe molecules become more nonpolar and have much stronger hydrogen bond donating ability with the increase of the alkyl length of acrylic ester in the copolymers. While for copolymer of N-isopropylacrylamides and octadecyl acrylate (NIPAM-C18).on increasing the molar feed ratio of ODA, the polarity of the micellar environments have the same rule as the above, however, their have no obvious rule. A preliminary discussion about these phenomena has been given.
- Water soluble polymer,
- Kamlet-Taft solvatochromic comprison method,
- Fluorescence probe,
- Hydrogen bond donor ability
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