基于紫外?臭氧辐照的挤塑聚苯乙烯表面改性研究

采用紫外?臭氧（UVO）辐照方式对挤塑聚苯乙烯保温板（XPSF）进行了表面改性，通过X射线光电子能谱仪（XPS）、接触角测量仪（CA）和扫描电子显微镜（SEM）对改性前后XPSF表面化学结构、润湿性能及表面形貌的变化规律进行了表征和测试。结果表明，随着UVO辐照时间的延长，XPSF表面含氧官能团数量逐渐增加，尤其在15 min时，XPSF表面的O/C值（O和C原子含量比值）由0.04增加至0.59；经UVO辐照30 min后，XPSF表面与水的接触角从未经处理的101.7°降至37.1°；UVO辐照前后XPSF表面形貌差异很小；随着放置时间的延长，XPSF表面氧含量逐渐降低，表面形成的含氧官能团消失，疏水性产生一定恢复；放置7 d时XPSF表面仍为氧化状态，接触角表现为亲水性；放置14 d时XPSF表面化学性质和润湿性已恢复至原始状态，但XPSF表面形貌并不会随放置时间的变化而改变。

Surface modification of extruded polystyrene based on ultraviolet?ozone irradiation

The surface of extruded polystyrene insulation board （XPSF） was modified through ultraviolet?ozone （UVO） irradiation， and then its chemical structure， wettability and surface morphology were investigated using an X?ray photoelectron spectroscope， a contact angle meter， and a scanning electron microscopy. The results indicated that more oxygen?containing groups were produced on the XPSF surface with an increase in the UVO irradiation time. Especially after UVO irradiation for 15 min， the atomic ratio of O to C elements of the XPSF surface was increased from 0.04 to 0.59. The contact angle between XPSF and deionized water droplets decreased from 101.7 ° to 37.1 ° after UVO irradiation for 30 min. The XPSF surface showed an unchanged morphology after UVO exposure. The oxygen content of XPSF decreased gradually with an increase in standing time， suggesting that the oxygen?containing groups were lost from the surface of XPSF， thus recovering the hydrophobicity. After storage for 7 days， XPSF was still oxidized， resulting in a hydrophilic surface. Nevertheless， the wettability and chemical structure of XPSF was returned to its original state after storage for 14 days. However， the XPSF surface still exhibited an unchanged morphology.