It is favorable for the increase of the adsorption film thickness by increasing the lyophobic chain.The determination of adsorption film thickness verifies the validity of the modification result.

木钠及改木钠在疏和亲体表面的吸附层厚度不同，分子疏链段的加有利在疏（煤）表面的吸附厚度。

But for benzene, when treated with SDM-A there was a turning point in its adsorption isotherm, which corresponding to the dividing point between monomolecular and multimolecular layer adsorption.

在用SDM-A处理苯的吸附时，出现折线形的吸附等温线，折线的转折点正好是单分子层吸附与多分子层吸附的分界点。