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    张晓丹, 姚旭, 徐世爱. 新型有机/无机复合紫外吸收剂的制备及其在PVC中的应用[J]. 功能高分子学报, 2019, 32(3): 398-404. doi: 10.14133/j.cnki.1008-9357.20180715002
    引用本文: 张晓丹, 姚旭, 徐世爱. 新型有机/无机复合紫外吸收剂的制备及其在PVC中的应用[J]. 功能高分子学报, 2019, 32(3): 398-404. doi: 10.14133/j.cnki.1008-9357.20180715002
    ZHANG Xiaodan, YAO Xu, XU Shiai. Preparation and Application in PVC of Novel Organic/Inorganic Composite UV Absorber[J]. Journal of Functional Polymers, 2019, 32(3): 398-404. doi: 10.14133/j.cnki.1008-9357.20180715002
    Citation: ZHANG Xiaodan, YAO Xu, XU Shiai. Preparation and Application in PVC of Novel Organic/Inorganic Composite UV Absorber[J]. Journal of Functional Polymers, 2019, 32(3): 398-404. doi: 10.14133/j.cnki.1008-9357.20180715002

    新型有机/无机复合紫外吸收剂的制备及其在PVC中的应用

    Preparation and Application in PVC of Novel Organic/Inorganic Composite UV Absorber

    • 摘要: 将全波段紫外吸收剂聚苯并咪唑(PBI)与纳米SiO2复配制备了有机/无机复合紫外吸收剂,用于改善聚氯乙烯(PVC)的紫外老化性能。为了增强纳米SiO2与PBI之间的相互作用,先用硅烷偶联剂γ-氨丙基三乙氧基硅烷对纳米SiO2改性,产物命名为MSiO2,然后将PBI涂覆到MSiO2表面得到复合填料PBI@MSiO2,最后将填料与PVC通过溶体共混制备复合材料。使用紫外-可见分光光度计和万能拉伸试验机等对复合材料的紫外吸收性能和力学性能等进行了表征和对比分析。结果表明,PBI@MSiO2粒子显著改善了复合材料的紫外吸收性能,375 nm处的紫外吸收率可达99%;并改善了复合材料的力学性能和屈服强度,当PBI@MSiO2质量分数为6%时,复合材料屈服强度可达63.3 MPa。

       

      Abstract: Poly (vinyl chloride) (PVC) is widely used in many fields due to its excellent non-flammable, corrosion and wear resistant properties. However, its thermal and optical stabilities are very poor which dramatically limit its outdoor application. The most effective way to improve PVC optical stability is the addition of light stabilizers. However, most of the currently used light stabilizers are poorly transparent which thereby restricts their use. In addition, most of the light stabilizers are small molecules, which are easily volatilized or migrated during their applications. In the present study, a novel organic/inorganic composite UV absorber was prepared by the combination of nano silica (SiO2) with a panchromatic UV absorber polybenzimidazole (PBI), which was used to improve the UV resistance of PVC. In order to enhance the compatibility between nano SiO2 and PBI, silane coupling agent γ-aminopropyltriethoxysilane was used to modify nano SiO2 (MSiO2), after which PBI was coated onto the resultant MSiO2 (PBI@MSiO2). The PVC/PBI@MSiO2 composites were subsequently prepared by melt blending. The UV absorption, mechanical properties, morphology and thermal stability of the obtained composites were investigated and compared. The SEM observation reveals that PBI@MSiO2 particles disperses homogenously in the PVC matrix, and the PVC/PBI@MSiO2 composites exhibit excellent thermal stability, UV-aging resistance and good mechanical properties. In the presence of 6% (mass fraction) PBI@MSiO2, the initial thermal decomposition temperature of the composite is significantly increased by about 34℃ compared with that of pure PVC. Additionally, the UV-absorbance at 375 nm can reach 99%, and the yield strength is 63.3 MPa.

       

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