Synthesis of acrylic copolymers with pendant hydrophilic groups and comparative surface tension studies with corresponding siloxane copolymers

Wuu Jyh Liang, Ping-Lin Kuo

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4 Citations (Scopus)

Abstract

Methyl methacrylate (MMA) and methacrylic acid glycidyl ester (MAGE) have been copolymerized and three water-soluble derivatives of these types of copolymers have been synthesized by opening the epoxide ring with different hydrophilic functional groups like diethanolamine (CHE) quaternary diethylamine (CQDEA) and quaternary diethanolamine (CQHE). The structures have been identified by 1H and 13C NMR spectra. The behaviors in aqueous medium have been investigated in terms of the surface tension and the ratios of intensities of the fluorescence (I1II3). The results are compared with those of the corresponding water-soluble siloxane copolymers (SHE, SQDEA, SQHE). The plot of I1II3 as a function of polymer concentration verifies the existence of aggregates and indicates the extent of aggregate formation. It is found that the polymer molecules begin to transfer to the air/water interface before they start to form aggregates for both acrylic and siloxane copolymers. It is evident from the surface tension measurements that efficiency of these polymers to reduce surface tension in aqueous solution is in the order SHE > SQHE > SQDEA and CHE > CQDEA > CQHE. The plots of I1II3 as a function of polymer concentration show that the ease of formation of aggregates in aqueous solutions of the above-mentioned polymers is in the order SHE > SQDEA > SQHE and CHE > CQDEA > CQHE. The ability of aggregates formation in aqueous solution increases with increasing polymer concentration and the hydrophilicity of the hydrophilic moieties. Moreover, the inner core of these copolymer aggregates is less closely packed than those for usual surfactants like sodium dodecylsulfate (SDS). However, the inner cores of the aggregates of siloxane copolymers in solution are more hydrophobic than those of acrylic copolymers.

Original languageEnglish
Pages (from-to)1902-1908
Number of pages7
JournalMacromolecular Chemistry and Physics
Volume202
Issue number9
DOIs
Publication statusPublished - 2001 Jul 6

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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