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Properties and structure of poly(vinyl alcohol)/silica composites

机译:聚乙烯醇/二氧化硅复合材料的性能和结构

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The relationships between the properties and structure are discussed for poly(vinyl alcohol)(PVA)/silica composites prepared through the sol-gel process. The composites became stiff and brittle with increasing the silica content. The properties of the composites were changed drastically at around the composition of PVA/silica = 70/30 wt %. For example, there was no large change in the Young's modulus above 30 wt % of silica content (Pure PVA: 31.8 MPa, silica 30%: 52.6 MPa, silica 50%: 55.2 MPa). Consequently, it was considered that the three-dimensional network structure of silica could be formed in the composite with more than 30 wt % of silica in PVA. From this behavior, it could be considered that the crystal growth of PVA was remarkably inhibited by silica network.
机译:讨论了通过溶胶-凝胶法制备的聚乙烯醇(PVA)/二氧化硅复合材料的性能与结构之间的关系。随着二氧化硅含量的增加,复合材料变硬和变脆。在PVA /二氧化硅的组成= 70/30 wt%时,复合材料的性能发生了巨大变化。例如,在二氧化硅含量的30重量%以上时,杨氏模量没有大变化(纯PVA:31.8MPa,二氧化硅30%:52.6MPa,二氧化硅50%:55.2MPa)。因此,认为在PVA中二氧化硅的含量超过30wt%的复合物中可以形成二氧化硅的三维网络结构。从该行为,可以认为PVA的晶体生长被二氧化硅网络显着抑制。

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