Effect of silica‐coated TiO 2 nanorods on the foamability of polypropylene and photostability of foamed polypropylene
Effect of silica‐coated TiO 2 nanorods on the foamability of polypropylene and photostability of foamed polypropylene
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DOI：
10.1002/pat.5336
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发表时间：
2021-04
影响因子：
3.4
通讯作者：
Wenjing Yuan;Feng Wang;Chong Gao;Peng Liu;Yanfen Ding;Shimin Zhang;Mingshu Yang
中科院分区：
文献类型：
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作者：
Wenjing Yuan;Feng Wang;Chong Gao;Peng Liu;Yanfen Ding;Shimin Zhang;Mingshu Yang
关于纳米棒非均相成核能力和聚丙烯泡沫材料耐温性能的研究非常有限。在本研究中，用二氧化硅包覆具有紫外吸收功能的金红石型tio2纳米棒，然后煅烧。通过熔融共混，得到的纳米棒（用“TS”表示）可以均匀地分散在PP基体中。以超临界二氧化碳（scCO2）为物理发泡剂，研究了线性PP及其复合材料的发泡性能。结果表明，加入5 wt% TS后，由于分散良好的TS纳米棒提供了大量成核位点，使得PP/TS‐5%泡沫具有更高的细胞密度、规则的细胞结构和均匀的细胞分布。同时，通过UVB辐照前后PP泡沫试样的宏观或微观形貌、熔融结晶行为的变化来评价其老化性能。直观地发现，紫外光对PP泡沫表面造成的损伤，包括表面的侵蚀、细胞的崩溃和PP链的降解，可以被TS纳米棒的掺入显著抑制。研究结果表明，TS纳米棒可以作为多功能纳米填料制备具有较好发泡性和光稳定性的PP泡沫材料。
Researches about the heterogeneous nucleation ability of nanorods and the weather resistance of polypropylene (PP) foams were very limited. In this study, the well‐defined rutile TiO2nanorods with UV‐absorbing function were coated with silica and then calcined. The obtained nanorods (denoted as “TS”) could be uniformly dispersed in PP matrix by melt blending. The foaming behavior of linear PP and its composites was investigated by using supercritical carbon dioxide (scCO2) as a physical foaming agent. The results demonstrated that the addition of 5 wt% TS made PP/TS‐5% foam have higher cell density, regular cell structure and uniform cell distribution owing to the large numbers of nucleation sites provided by well‐dispersed TS nanorods. At the same time, the aging performance of PP foam samples was evaluated by the changes of macro or micro morphology, melting and crystallization behavior before and after UVB irradiation. It was intuitively found that the damage to the surface of PP foams caused by UV light, involving the erosion of surface, the collapse of cells and the degradation of PP chains could be significantly suppressed by the incorporation of TS nanorods. These findings indicated that TS nanorods could be used as multifunctional nanofillers to achieve the PP foams with improved foamability and photostability.