Lee, SB Song, SC Jin, JI Sohn, YS 2024-01-21T13:13:29Z 2024-01-21T13:13:29Z 2021-09-05 2000-11 0303-402X https://pubs.kist.re.kr/handle/201004/140985 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 Delta LCSTs (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 degreesC 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 tetrapropy-lammonium bromide. Graphic models for the molecular interactions of polymer/surfactant and polymer/surfactant/salt in aqueous solutions were proposed. English SPRINGER-VERLAG AQUEOUS POLY(VINYLPYRROLIDONE) SOLUTIONS BIODEGRADABLE THERMOSENSITIVE POLYMERS SODIUM DODECYL-SULFATE INORGANIC SALTS POLY(N-ISOPROPYLACRYLAMIDE) GEL PHASE-TRANSITION BEHAVIOR Surfactant effect on the lower critical solution temperature of poly(organophosphazenes) with methoxy-poly(ethylene glycol) and amino acid esters as side groups Article 10.1007/s003960000368 1 COLLOID AND POLYMER SCIENCE, v.278, no.11, pp.1097 - 1102 COLLOID AND POLYMER SCIENCE 278 11 1097 1102 scie scopus 000165461000008 2-s2.0-0033730452 Chemistry, Physical Polymer Science Chemistry Polymer Science Article AQUEOUS POLY(VINYLPYRROLIDONE) SOLUTIONS BIODEGRADABLE THERMOSENSITIVE POLYMERS SODIUM DODECYL-SULFATE INORGANIC SALTS POLY(N-ISOPROPYLACRYLAMIDE) GEL PHASE-TRANSITION BEHAVIOR polyphosphazene thermosensitivity lower critical solution temperature surfactant effect