The BaTiO₃?TiO₂ composites were prepared by using hydrate barium hydroxide (Ba(OH)₂·8H₂O) and titanium dioxide (TiO₂) as raw materials with soft chemical hydrothermal method at 120 ℃ and different Ba/Ti molar ratios.The structure of the prepared composites with different Ba/Ti molar ratios was analyzed by X?ray diffraction (XRD),scanning electron microscopy (SEM),and UV?visible absorption spectroscopy (UV?Vis),the degradation effect of the complex on the simulated degradation pollutant,rhodamine B (RhB) was investigated.The results indicate that the BaTiO₃?TiO₂ composites obtained at a Ba/Ti molar ratio of 0.50 have an excellent catalytic effect for the degradation of rhodamine B (RhB) during the simulation of dye wastewater degradation.Meanwhile,more active sites formed at the Ba/Ti molar ratio of 0.50, which facilitated the photocatalytic reaction.

Shape memory polymer (SMP) and self?healing polymer (SHP) as the representative of "smart" polymers have become the most dynamic research direction in this field,among which photosensitive SMP and SHP have been received wide attentions by industry and academia.This paper reviews the basic principles of photosensitive SMP and SHP, and classifies this type of polymers into reversible photochemical reaction SMP,photothermal SMP,photodimerization reaction SHP,photocrosslinking reaction SHP,and bifunctional SMP/SHP by referencing the most important and representative literature reports in recent years.