Abstract
pKa values of linear and cyclic methacrylic acid oligomers with 14 of degree of polymerization were measured in aqueous solution by pH titration and compared with that of poly(methacrylic acid), PMAA, prepared by radical polymerization. pKa of cyclic methacrylic acid oligomer, 4.83, was between those of linear methacrylic acid oligomer and PMAA, 4.69 and 5.05, respectively, suggesting that the hydrophobic field was formed with methyl groups in cyclic methacrylic acid oligomer in aqueous solution. In order to investigate the inclusion ability of cyclic methacrylic acid oligomer in aqueous solution, methylene blue was added to the solution of cyclic methacrylic acid oligomer. Interaction between methylene blue and cyclic methacrylic acid oligomer was investigated by UV−vis spectrometry at pH = 7.2 and 2D-NMR with nuclear Overhauser enhancement spectroscopy. Cyclic methacrylic acid oligomer enhanced the dimer formation of methylene blue. The size of hydrophobic field in cyclic methacrylic acid oligomer was estimated by MM2.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
