For the apolar compounds, the derivatization was not necessary.

对于非极性，不一定要进行这样的衍。

Moreover, the results of IR spectrum and apolar component of surface free energy showed that the alkyl chains of OTS tilted on the surface of PTW after the modification.

IR分析和色散分量测定，性后OTS的烷基链倾斜在PTW面。