A neutron reflectivity study of poly(N-isopropylacrylamide) at the air-water interface with and without sodium dodecyl sulfate

被引：62
|
作者：
Richardson, RM
Pelton, R [1 ]
Cosgrove, T
Zhang, J
机构：
[1] McMaster Univ, Dept Chem Engn, McMaster Ctr Pulp & Paper Res, Hamilton, ON L8S 4L7, Canada
[2] Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England
来源：
MACROMOLECULES | 2000年 / 33卷 / 17期
关键词：
D O I：
10.1021/ma000095p
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The properties of poly(N-isopropylacrylamide) (polyNIPAM) at the air/water interface, with and without sodium dodecyl sulfate (SDS), were measured by neutron reflectivity and surface tension. Below the lower critical solution temperature (LCST), polyNIPAM adsorbs at the air/water interface to give a thin (delta similar to 1.5 nm) layer with a low water content approximately equal to phase-separated polyNIPAM above the LCST. Above the LCST the adsorbed polymer layer increases by a factor of 10 approximately equal to the effective diameter of a single phase-separated polymer chain (a globule). Polymer-bound SDS lowers the density of adsorbed polyNIPAM because of electrostatic effects.
引用
收藏
页码：6269 / 6274
页数：6
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