以聚氧乙烯(PEO)为亲水改性剂、纳米 TiO2颗粒作为光催化助氧剂,与低密度聚乙烯(LDPE)树脂复合制备了光氧化-生物降解TiO2/PEO/LDPE 纳米复合薄膜。通过密封堆肥和土壤微生物的降解实验,研究了该复合薄膜在空气中紫外光氧化降解后的生物降解性能。结果表明,TiO2/PEO/LDPE 复合薄膜在 UVA340的紫外光照射600 h后,发生了明显的降解,羰基指数增大,产生了大量羰基类的化合物,结构发生明显的破坏；光氧化后的薄膜碎片经过180 d的堆肥或254 d的土壤微生物降解后,其矿化率达到15．26％,薄膜表面长满了孢子及大量的菌丝,能够为微生物的生长提供所需的碳源。PEO 的加入能提高纳米 TiO2在 LDPE 基体中的亲水性,从而提高其光催化氧化活性,使得LDPE薄膜的光氧化降解程度明显增大,有利于其后续的生物降解。
The photodegradable TiO2/PEO/LDPE composite film was prepared by an addition of TiO2 as a pro-oxidant containing polyethylene oxide (PEO)into commercial LDPE.The biological mineralization in a seal composting environment and microbial degradation of oxidized LDPE were studied.The results show that the intensities of carbonyl group peak in the TiO2/PEO/LDPE composite film with exposed to UVA340 irradiation for 600 h increased would be due to ester,acid and aldehyde compounds,which were produced by LDPE degra-dation,increased in films and the structure of TiO2/PEO/LDPE composite film destroyed clearly.The TiO2/PEO/LDPE composite films with pro-oxidant exposed to UV irradiation followed by compost for 180 days or soil microbial degradation for 254 days.In this process,the mineralization rate of TiO2/PEO/LDPE composite film reached 1 5 .2 6%.On the other hand,microscopic examination showed a profuse mycelia growth and spores on the oxidized TiO2/PEO/LDPE composite films,which illustrated that the soil microbial were fully capable of utilizing degradation products as a carbon source.The addition of PEO improves the hydrophilicity of nano-TiO2 in LDPE matrix,thus the photocatalytic degradation efficiency increases facilitating the oxo-degradation of LDPE greatly which promotes the subsequent biodegradation.
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