THEORY OF STABILIZATION OF COLLOIDS BY ADSORBED POLYMER
THEORY OF STABILIZATION OF COLLOIDS BY ADSORBED POLYMER
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DOI：
10.1098/rspa.1974.0063
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发表时间：
1974-01-01
期刊：
影响因子：
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通讯作者：
EDWARDS, SF
中科院分区：
文献类型：
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作者：
DOLAN, AK;EDWARDS, SF
本文用简单的解析形式给出了一端吸附在平面上的无规飞行高分子链的构型自由能随与平行平面的距离的函数关系。并将此结果用于讨论吸附聚合物对胶体悬浮液的稳定作用。根据这一理论，可能发生两种类型的胶体颗粒聚集。当LI < AS/2π 3 NkT（其中L为高分子链的链长，L为高分子链的轮廓长度），A为Hamaker常数，N /S为单位面积上吸附的高分子链数，kT为Boltzman常数与温度的乘积时，粒子间的结合紧密，而当AS/2π 3 kT < IL < AS/nkT lg 2Na时，粒子间的结合较松散。预计排除体积效应的存在将大大增加相对于较松散缔合的稳定性。
The configurational free energy of random flight polymer chains adsorbed by one end onto a plane surface as a function of the distance from a parallel plane surface is expressed to a good approximation in simple analytic form. The result is used to discuss the stabilization of a colloid suspension by adsorbed polymer. According to this theory two types of aggregation of colloid particles may occur. IfLI < AS/2π3NkT, wherelis the link length andLthe contour length of a polymer chain,Ais the Hamaker constant,N /Sis the number of adsorbed polymer chains per unit area andkTis the Boltzman constant multiplied by temperature, the particles adhere closely, but ifAS/2π3kT < IL < AS/nkT lg 2Na looser association is formed. It is expected that the presence of excluded volume effects would greatly increase the stability against the looser association.