caa a22 4500 47576501X CHVBK 20180406123603.0 cr unu---uuuuu 170329e20001101xx s 000 0 eng 10.1007/s003960000368 doi (NATIONALLICENCE)springer-10.1007/s003960000368 Surfactant effect on the lower critical solution temperature of poly(organophosphazenes) with methoxy-poly(ethylene glycol) and amino acid esters as side groups [Elektronische Daten] [S. B. Lee, S.-C. Song, J.-I. Jin, Y. S. Sohn]  The surfactant effect on the lower critical solution temperature (LCST) of thermosensitive poly(organophosphazenes) with methoxy-poly(ethylene glycol) and amino acid esters as side groups was examined in terms of molecular interactions between the polyphosphazenes and surfactants including various anionic, cationic, and nonionic surfactants in aqueous solution. Most of the anionic and cationic surfactants increased the LCST of the polymers: the LCST increased more sharply with increasing length and hydrophobicity of the hydrophobic part of the surfactant molecule. The ΔLCSTs (T 0.03M − T 0M), the change in the LCST by addition of 0 and 0.03 M sodium dodecyl sulfate (SDS), were found to be 7.0 and 14.5 °C for the polymers bearing ethyl esters of glycine and aspartic acid, respectively. The LCST increase of poly(organophosphazene) having a more hydrophobic aspartic acid ethyl ester was 2 times larger compared with that of the polymer having glycine ethyl ester as a side group. The binding behavior of SDS to the polymer bearing glycine ethyl ester as a hydrophobic group was explained from the results of titration of the polymer solutions containing SDS with tetrapropylammonium bromide. Graphic models for the molecular interactions of polymer/surfactant and polymer/surfactant/salt in aqueous solutions were proposed. Springer-Verlag Berlin Heidelberg, 2000 Key words Polyphosphazene nationallicence Thermosensitivity nationallicence Lower critical solution temperature nationallicence Surfactant effect nationallicence Lee S. B. Inorganic Chemistry Laboratory Korea Institute of Science and Technology Seoul 130-650, South Korea e-mail: scsong@kist.re.kr Tel.: +82-2-9585123 Fax: +82-2-9585089, KR aut Song S.-C Inorganic Chemistry Laboratory Korea Institute of Science and Technology Seoul 130-650, South Korea e-mail: scsong@kist.re.kr Tel.: +82-2-9585123 Fax: +82-2-9585089, KR aut Jin J.-I Department of Chemistry Korea University, Seoul 136-701 South Korea, KR aut Sohn Y. S. Inorganic Chemistry Laboratory Korea Institute of Science and Technology Seoul 130-650, South Korea e-mail: scsong@kist.re.kr Tel.: +82-2-9585123 Fax: +82-2-9585089, KR aut https://doi.org/10.1007/s003960000368 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960000368 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lee S. B. Inorganic Chemistry Laboratory Korea Institute of Science and Technology Seoul 130-650, South Korea e-mail: scsong@kist.re.kr Tel.: +82-2-9585123 Fax: +82-2-9585089, KR aut NATIONALLICENCE 700 1- Song S.-C Inorganic Chemistry Laboratory Korea Institute of Science and Technology Seoul 130-650, South Korea e-mail: scsong@kist.re.kr Tel.: +82-2-9585123 Fax: +82-2-9585089, KR aut NATIONALLICENCE 700 1- Jin J.-I Department of Chemistry Korea University, Seoul 136-701 South Korea, KR aut NATIONALLICENCE 700 1- Sohn Y. S. Inorganic Chemistry Laboratory Korea Institute of Science and Technology Seoul 130-650, South Korea e-mail: scsong@kist.re.kr Tel.: +82-2-9585123 Fax: +82-2-9585089, KR aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer