TY - JOUR
T1 - Adsorption of hydrophobically end-capped poly(ethylene oxide) on poly(tetrafluoroethylene) latex particles
T2 - Light scattering study
AU - Kim, Myungwoong
AU - Sim, Jae Hyun
AU - Sohn, Daewon
PY - 2003/12/30
Y1 - 2003/12/30
N2 - The adsorption of an associating polymer, hydrophobically end-capped poly(ethylene oxide) urethane resin (HEUR), on PTFE latex was investigated in aqueous solution by static and dynamic light scattering. A PTFE latex (stabilizer free)/HEUR/water system (probe-polymer interaction system) was compared with a PTFE latex (with stabilizer)/PEO/water system (probe-polymer noninteraction system). Static scattering studies show that there was no size difference in the PTFE latex (with stabilizer)/PEO/water solution by increasing the PEO concentration, but there was an increase of particle size in the PTFE latex/HEUR/water solution by increase the HEUR concentration. The stabilizer prevents interaction between PTFE and PEO in the PTFE latex (with stabilizer)/PEO/water systems, but HEURs are attached on the PTFE particles in the PTFE latex/HEUR/water system. In polarized and depolarized dynamic light scattering studies, a v parameter in "stretched exponential" form of translational diffusion was a sensitive index for showing particle and polymer interaction in the solution, but the parameter of rotational diffusion was not sensitive. The plot of the quotient DR/DT vs polymer concentration shows two transitions in the PTFE latex/HEUR/water system. In the PTFE latex (with stabilizer)/PEO/water system, however, the value of DR/DT was constant by increasing PEO concentration. On the basis of these experimental data, we suggest three step adsorption mechanisms: molecular adsorption on PTFE particle at low HEUR concentration, CHEUR < 8 mg/mL; growing of micellar structure at the intermediate concentration, 8 mg/L < CHEUR < 15.6 mg/mL; and micellar adsorption after saturation on the PTFE surface at high concentration, CHEUR > 15.6 mg/mL.
AB - The adsorption of an associating polymer, hydrophobically end-capped poly(ethylene oxide) urethane resin (HEUR), on PTFE latex was investigated in aqueous solution by static and dynamic light scattering. A PTFE latex (stabilizer free)/HEUR/water system (probe-polymer interaction system) was compared with a PTFE latex (with stabilizer)/PEO/water system (probe-polymer noninteraction system). Static scattering studies show that there was no size difference in the PTFE latex (with stabilizer)/PEO/water solution by increasing the PEO concentration, but there was an increase of particle size in the PTFE latex/HEUR/water solution by increase the HEUR concentration. The stabilizer prevents interaction between PTFE and PEO in the PTFE latex (with stabilizer)/PEO/water systems, but HEURs are attached on the PTFE particles in the PTFE latex/HEUR/water system. In polarized and depolarized dynamic light scattering studies, a v parameter in "stretched exponential" form of translational diffusion was a sensitive index for showing particle and polymer interaction in the solution, but the parameter of rotational diffusion was not sensitive. The plot of the quotient DR/DT vs polymer concentration shows two transitions in the PTFE latex/HEUR/water system. In the PTFE latex (with stabilizer)/PEO/water system, however, the value of DR/DT was constant by increasing PEO concentration. On the basis of these experimental data, we suggest three step adsorption mechanisms: molecular adsorption on PTFE particle at low HEUR concentration, CHEUR < 8 mg/mL; growing of micellar structure at the intermediate concentration, 8 mg/L < CHEUR < 15.6 mg/mL; and micellar adsorption after saturation on the PTFE surface at high concentration, CHEUR > 15.6 mg/mL.
UR - http://www.scopus.com/inward/record.url?scp=0347949852&partnerID=8YFLogxK
U2 - 10.1021/ma0346714
DO - 10.1021/ma0346714
M3 - Article
AN - SCOPUS:0347949852
SN - 0024-9297
VL - 36
SP - 9986
EP - 9993
JO - Macromolecules
JF - Macromolecules
IS - 26
ER -