| Summary: | 碩士 === 中原大學 === 化學研究所 === 106 === In this study, there are two kinds of natural and synthetic inorganic layered materials, these layered materials were organomodified by organo modifiers, SDS (Sodium dodecyl sulfate), K2 (disodium cocoamphodipropionate), and DT-TEOS (dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride-tetraethyl orthosilicate) by ion exchange method to make organomodified layered materials. In the morphology of modified was layered materials measured by X-ray diffraction (WXRD), Scanning electron microscope (SEM) and Fourier transfer infra spectroscopy (FT-IR). The modified inorganic layered materials the intercalation amount of the modifier calculated by Thermogravimetric analysis (TGA). After successfully synthesis of inorganic nanofillers, further, these nanofillers were applied to make Polyvinyl acetate (PVAc) polymer composites by solvent casting and in situ polymerization methods. Dispersion morphology of nanocomposites confirmed by XRD, Transmission electron microscopy (TEM). Furthermore, Thermal properties investigated by TGA, Differential scanning calorimeter (DSC), respectively. Solvent casting PVAc-CL120-K2 3.0 phr nanocomposite 5 wt% weight loss temperature (T5d), glass transition temperature (Tg) increased 20.65 °C and 13.72 °C, respectively as compare to pure PVAc. While in the case of the in-situ polymerized PVAc- Mg-Al-1.0 phr-I nanocomposites maximum pyrolysis temperature 39.92 °C increased compared to pure PVAc. The effect of UV-visible properties PVAc nanocomposites investigated. Solvent casting PVAc-Mg-Al-SDS-3.0 phr nanocomposites transparency decreased from 67.4% to 47.1%, and the in-situ polymerized PVAc-Mg-Al-3.0 phr-I transparency decreased from 55.3% to 26.7%. The maximum tensile strength of solvent casting PVAc-CL120-K2-3.0 phr nanocomposites increased from 1.59 MPa to 6.06 MPa. Similarly, the maximum tensile strength of in situ polymerized PVAc-CL120-2.0 phr-I nanocomposites increased from 5.57 MPa to 8.12 MPa. Moreover, the adhesion strength of PVAc nanocomposites measured with hundred grid knife, solvent casting has 4B adhesion under PVAc-CL120-K2 system, The PVAc-Mg-Al-SDS system can increase the adhesion to 5B, and the in-situ polymerization in the PVAc-CL120-I and PVAc-CL120-K2-I systems can maintain the adhesion at 4B. Flammability of nanocomposites determined after addition of flame retardant agent. The effect of Nanofiller on flammability of solvent casting and in-situ polymerized PVAc-CL120-DT and PVAc-Mg-Al-I nanocomposites studied.
In this study, natural and synthetic inorganic layered materials were applied to make Polyvinyl acetate (PVAc) polymer composites by solvent casting can effectively increase the thermal properties and maximum tensile strength of the polymer without affecting the transparency, elongation rate and adhesion of the polymer, Adding natural and synthetic inorganic layered materials by in-situ polymerization has a great influence on thermal properties and maximum tensile strength than solvent casting, but the elongation rate will decrease with the increase of the amount of clay added, and there is a greater impact on the transparency of polymers. In the aspect of flammability, the PVAc nanocomposite with solvent casting is much better than that of in-situ polymerization. In addition, the above-mentioned improvement in properties makes PVAc resin more widely used in water-based paints and adhesives.
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