Premium
Surface modification of kaolin. 2. Enhanced steric stabilisation of polymer‐modified kaolin
Author(s) -
Molphy Marylou,
Mainwaring David E.,
Rizzardo Ezio,
Gunatillake Pathiraja A.,
Laslett Robert L.
Publication year - 1995
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1995.210370107
Subject(s) - ethylene oxide , polymer , materials science , chemical engineering , flocculation , steric effects , polymer chemistry , propylene oxide , oxide , contact angle , dispersion (optics) , surface modification , dispersion stability , aqueous solution , particle (ecology) , copolymer , chemistry , composite material , organic chemistry , physics , optics , engineering , metallurgy , oceanography , geology
The polymer‐modified surface of kaolin was studied to determine the effect of changing the molecular weight of the polymer chain grafted on the surface. The particle was modified by attaching poly(ethylene oxide) to the surface using a urethane linkage. Upper critical flocculation temperature and contact angle measurements were conducted to quantify the changes in surface characteristics and stability in an aqueous dispersion. The effect of pH on stability and grafted density of polymer chains showed the mechanism of stabilisation to be that of enhanced steric stabilisation. The kaolin particle was also modified with the more hydrophobic poly(propylene oxide). The behaviour was characterised as for poly(ethylene oxide) and interesting differences in extent and mechanism for stabilisation were observed.