For the apolar compounds, the derivatization was not necessary.

对于非极性化合，要进行这样的衍化。

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分析和色散分量明，改性后OTS的烷基链倾斜在PTW面。