Preparation of degradable polypropylene by an addition of poly(ethylene oxide) microcapsule containing TiO2 part II. Modification of calcium phosphate on the TiO2 surface and its effect
Preparation of degradable polypropylene by an addition of poly(ethylene oxide) microcapsule containing TiO2 part II. Modification of calcium phosphate on the TiO2 surface and its effect
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DOI：
10.1016/j.polymdegradstab.2010.06.009
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发表时间：
2010-09
影响因子：
5.9
通讯作者：
Kensuke Miyazaki;Hisayuki Nakatani
中科院分区：
文献类型：
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作者：
Kensuke Miyazaki;Hisayuki Nakatani
为了制备具有更高降解率的新型光降解聚丙烯（PP），制备了含有聚环氧乙烷（PEO）/改性TiO2微胶囊的PP复合材料。通过在不同Ca/P摩尔比条件下合成插有琥珀酸离子的磷酸八钙(OCPC)对TiO2进行改性。结果发现Ca/P=3.5和3.6M的合成条件适合制备OCPC。然而，这些 Ca/P 条件下 TiO2 表面的微观组成不同，影响了 PP/PEO/改性 TiO2 复合材料中 PP 的光降解速率。傅里叶变换红外(IR)和拉伸测试结果表明，TiO2表面OCPC覆盖材料的存在带来了较高的PP光降解率。降解的促进行为是由于OCPC在降解过程中释放出酸性物质（琥珀酸离子）。此外，OCPC在TiO2表面的较高覆盖率带来了降解的诱导期。
To prepare a novel photo-degradable polypropylene (PP) with a higher degradation rate, a PP composite containing a poly(ethylene oxide) (PEO)/modified TiO2microcapsule was prepared. The modification of the TiO2was performed by the synthesis of octacalcium phosphate intercalated with succinic acid ion (OCPC) under various Ca/P molar ratio conditions. It was found that the synthesis conditions of the Ca/P = 3.5 and 3.6 M ratios were suitable to prepare the OCPC. However, the microscopic composition on the TiO2surface was different between these Ca/P conditions and affected the PP photo-degradation rate in the PP/PEO/modified TiO2composite. It was found from the Fourier Transform Infrared (IR) and the tensile testing measurements that the existence of the OCPC covering material on the TiO2surface brought about the higher PP photo-degradation rate. The facilitation behavior of the degradation was due to the release of the acid species (succinic acid ion) from the OCPC in the degradation process. In addition, the higher coverage of the OCPC on the TiO2surface brought about an induction period for the degradation.