Aggregation and polymerization of PEG-based macromonomers with methacryloyl group as the only hydrophobic segment

Maiti, Souvik ; Chatterji, Prabha R. ; Nisha, C. K. ; Manorama, S. V. ; Aswal, Vinod K. ; Goyal, Prem S. (2001) Aggregation and polymerization of PEG-based macromonomers with methacryloyl group as the only hydrophobic segment Journal of Colloid and Interface Science, 240 (2). pp. 630-635. ISSN 0021-9797

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1006/jcis.2001.7683

Abstract

Aggregation behavior in aqueous solution of a series of poly (ethylene glycol) (PEG)-based macromonomers with methacryloyl group as the only hydrophobic segment has been investigated using surface tension, steady-state and time-resolved fluorescence spectroscopy using pyrene as a probe, and small-angle neutron scattering techniques. The general formula of these macromonomers is CH2C(CH3)–CO–O–Em–CH3, where E is the ethylene glycol unit and m=8 (ME8), 18 (ME18), 49 (ME49), and 120 (ME120). The results indicate that a macromonomer with 8 ethylene glycol units forms as an aggregate above a certain critical concentration, which can be defined as critical aggregation concentration. The observed high value of I1/I3 in pyrene emission spectra at the interface of these aggregates and the inability to scatter a neutron beam by these aggregates indicate that the hydrophobic cluster formed by this macromonomer is remarkably solvated. ME18 has a tendency to aggregate but others do not form any hydrophobic cluster. The homopolymerization behaviors of these macromonomers in an aqueous medium at 70°C are consistent with these possibi- lities.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Macromonomers; Aggregation; Rapid Polymerization
ID Code:103719
Deposited On:31 Mar 2017 07:29
Last Modified:31 Mar 2017 07:29

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