Synthesis of novel ultraviolet stabilizers based on [60]fullerene and their effects on photo-oxidative degradation of polystyrene |
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Authors: | Lipengcheng Xiao Yang Zhao Qingchun Zhang Zuohu Chai |
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Affiliation: | State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang, P. R. China |
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Abstract: | AbstractTwo N-benzyl fulleropyrrolidines were synthesized via Prato reaction. The polystyrene (PS) films containing 0.5?wt% fullerene and N-benzyl fulleropyrrolidines were prepared from toluene via the solvent evaporation method. The photo-oxidative activities and thermostability of these films were determined by monitoring the average molecular weight and thermogravimetric curve. The changes in weight loss (%) and tensile strength with irradiation time were also tracked. After 480?h of illumination, the weight loss of PS films was 6.8%, while the corresponding index of PS with C60 was 6.1%. The weight loss of PS with two fulleropyrrolidines was significantly lower than that before (3.8% and 2.7%). The results manifested the good ultraviolet (UV) stabilizing effect and thermostability of these complex films compared with PS. A probable mechanism was proposed to account for the stabilizing action of the 60]fullerene derivatives as multifunctional UV stabilizers. |
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Keywords: | Fulleropyrrolidine photo-oxidative degradation thermostability ultraviolet stabilizers |
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