| α-zirconium phosphate (α-ZrP), Zr(HPO4)2 H2O, is kind of layered inorganic, it will still keep its well-ordered structure when the guests are inserted into the interlayers. Because of its high ion-exchange capacity, tunnable aspect ratio and narrow size distribution,α-ZrP is suitable to prepare polymer/layered inorganic nanocomposites. However, higher crystallinity and aspect ratio corresponds to higher particle aggregations and bad dispersions. In order to improve the compatibility betweenα-ZrP and polymers, we have carried out the work as follows:1. In this work,α-ZrP was prepareded and exfoliated by n-Butylamine at first. And then a series of nanocomposite films that consisted of PVA and layered e-α-ZrP were prepared by a solution casting method. The results from XRD and SEM indicated that the PVA and e-α-ZrP possess good miscibility, which results from hydrogen bonding. Compared to the pure PVA, the tensile strength and elongation at break of the nanocomposite films increased by 17.3%,26.6% respectively.2. In this work, by controlling the concentration of phosphoric acid, three different aspect ratios crystalline a-ZrP have been prepared. The results indicated that higher concentration of phosphoric acid corresponded to higer crystallinity and aspect ratio ofα-ZrP. Based on the present study, higher aspect ratios can lead to significant improvements in tensile strength, elongation at break and heat distortion temperature, but overhigh aspect ratio would result in bad dispersions ofα-ZrP which can deteriorate the film properties.3. By introducing the carboxyl on starch sugar-ring, the hydrogen bonding and electrostatic interaction between oxidized starch (OST) and PVA were enhanced. Two series of nanocomposite films (POST-ZrPn and PST-ZrPn) were prepared by a solution casting method. The results from FT-IR, XRD and SEM indicated that the films of POST-ZrPn possessed better miscibility than PST-ZrPn, which resulted in improvement in mechanical properties, thermal stability and water-resistivity. Tensile strength and elongation at break of of the PVA/OST nanocomposite films increased from 6.6 to 15.1 MPa,35% to 63% asα-ZrP content increased from 0 to 1.5 wt%. However, higher loading ofα-ZrP resulted in aggregations ofα-ZrP and theσb,εb deteriorated. The presence ofα-ZrP also decreased the moisture uptake and increased the degradation temperatures of the nanocomposites.4. In this paper, zirconium sulphophenyl phosphonate (ZrSP) was synthesized in HF solution and characterized to prepare a series nanocomposites in which ZrSP was used as nanofiller. The results from FT-IR, SEM and XRD indicated that strong interaction between ZrSP and chitosan formed during the film-forming process, and the ZrSP could uniformly dispersed in chitosan matrix when ZrSP loading in the composites was less than 2 wt%. Additionally, because of the enhanced interfacial interaction between the fillers and matrix, the tensile strength, elongation at break, water resistance and thermal stability of the CS based nanocomposites were improved synchronously.
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