Photocatalytic Activity of Titania/Polydicyclopentadiene PolyHIPE Composites

Abstract

Macroporous polymer composites with photocatalytic activity are prepared by the polymerization of surface modified TiO2 nanoparticle stabilized high internal phase emulsions. Poly(ethylene glycol‐b‐propylene glycol‐b‐ethylene glycol) triblock copolymer is used to synthesize surface modified TiO2 anatase via a sol–gel method. Macroporous composites are obtained by the ring opening metathesis polymerization of dicyclopentadiene within the particle‐stabilized high internal phase emulsion templates. Photocatalytic activity of the resulting macroporous polymer composites is described by the kinetic data of the heterogeneous photocatalytic degradation reaction of 4‐nitrophenol.

Influence of nanoparticles and antioxidants on mechanical properties of titania/polydicyclopentadiene polyHIPEs: A statistical approach

“…Consequently, polymerizations of the continuous organic phase of Pickering emulsion templates resulted in tough and robust monoliths exhibiting classical open porous polyHIPE morphology. The morphological properties of the resulting materials were already discussed in detail in our previous study …”

“…Titania/polyDCPD polyHIPE composites were prepared according to the previously described method using SM‐TiO 2 nanoparticles for emulsion stabilization . Briefly, DCPD (54.9 mmol, 7.35 mL), 4 or 6 wt % of SM‐TiO 2 nanoparticles, and 0.2 wt % (regarding to total monomer amount) of octadecyl 3‐(3,5‐di‐tert‐butyl‐4‐hydroxyphenyl)propionate (14.33 mg) or pentaerythritol tetrakis(3,5‐di‐ tert ‐butyl‐4‐hydroxyhydrocinnamate) (14.13 mg) were added to a 250 mL two‐necked round bottom flask.…”

“…Moreover, increasing comonomer amount was found to increase the onset degradation temperatures of the specimens, however enhances the decomposition of the polymer backbone at higher temperatures. More recently, we prepared titania/polyDCPD polyHIPE composites from surface modified TiO 2 nanoparticle stabilized Pickering‐HIPEs for photocatalysis applications . The photocatalytic activity of the resulting materials was demonstrated through heterogeneous photocatalytic degradation experiments.…”

“…In this paper, as distinct from the previous studies, the influence of antioxidant addition to the HIPE formulation is demonstrated in terms of mechanical properties. With this aim, titania/polyDCPD polyHIPE composites were prepared using the same experimental approach as described previously . Variation of mechanical properties within a period of time was investigated by measuring the compression modulus and strength of the antioxidant containing composites having different amounts of nanoparticles.…”

Polivinil borat/TiO2 Nanokompozitlerin Fotokataliz Uygulaması

“…Son yıllarda atıksu arıtımında boya giderimi üzerine yapılan çalışmalarda, TiO 2 fotokatalizörün polimer matrikse tutturularak kullanımının önemine dikkat çekilmiştir. Literatürde, polidisiklopentadien/TiO 2 [8], düşük yoğunluklu polietilen/TiO 2 ve yüksek yoğunluklu polietilen/TiO 2 [7], selüloz/TiO 2 [9], poli(metil metakrilat)/TiO 2 [5], hidroksiapetit/poliakrilat/ TiO 2 [10], politetrahidrofuran-üretan dimetakrilat/TiO 2 [11], polipirol/TiO 2 [12] ve poli (3-heksiltiyofen)/TiO 2 [13] kompozit sistemlerinin fotokatalitik etkinliği çalışılmıştır. Belirtilen polimer matrikslerindeki TiO 2 fotokatalizörünün fotokatalitik etkinliği, model boyanın su ortamında bozunması ile tespit edilmiştir.…”