| Summary: | 碩士 === 逢甲大學 === 纖維與複合材料學系 === 107 === In this study, the hollow glass submicronspheres (HGSM) were prepared by sol-gel method, and the effects of rotational speeds on the particle size and shape of submicronspheres were also investigated. Then, the HGSM were heated to remove residual organic matter. Subsequently, the HGSM, PU and PMMA were blended and prepared into a composite film. Finally, the influence of the HGSM’s amount on the two composite films was analyzed, and their properties and functions were also discussed. The study is divided into two parts: The first part is to investigate the effect of different rotational speeds of 100 ~ 900 rpm on the preparation of the HGSM. and observe the sphere shape by SEM. The results showed that the submicrospheres prepared at 300 rpm were well dispersed and uniform in particle size. The average particle size of the submicrospheres prepared at 300 rpm was 811 nm and had the best dispersibility. It was also found that the HGSM was determined to have a hollow structure with an average wall thickness of about 150 nm. FTIR analysis found that the submicronspheres without heat treatment contained sterol and methyl groups; and after XRD analysis, it was confirmed that submicronspheres were hollow. The submicronspheres belonged to amorphous silicon oxide. The second part discusses the non-heat treated and heat-treated HGSM and the effects of amounts of addition of HGSM on the composite films of polyurethane (PU) and polymethyl methacrylate, (PMMA) and their physical, chemical and functional properties.
The HGSM /PU composite film was observed by SEM and found to have good interfacial compatibility, and the spheres were uniformly dispersed in the substrate; FT-IR analysis found that the composite film was a physically blended composite material. . Alambeta thermal analysis found that as the amount of submicron spheres increased, the heat transfer coefficient decreased to 37.2 mW/mK (for sample PU09). The endothermic and exothermic difference test showed that the temperature reached 34.8 °C under halogen irradiation. The PU had increased by 1.7 °C.
For the HGSM /PMMA composite film, it was found by SEM observation that the intercalation problem occurred between the HGSM and the PMMA substrate, and agglomeration was observed at 5 wt% (sample PMMA05x). In the light transmittance test, it was found that the transmittance in the visible light band decreased after the addition of the sphere, and it was 78.5% at 5 wt% (sample PMMA05). In the heat-covering test, it was found that the addition of HGSM could effectively improve the heat shielding rate of PMMA, and after sputtering a silver layer of 10 nm, the heat shielding rate reached 34.11% (sample PMMA05/Ag).
In this study, the prepared HGSM has good particle size dispersion, and the average particle size is nearly 20 times smaller than the commercially available hollow glass micronspheres, and has good performance in heat insulation and heat preservation. In the future, it is expected to be applied to thermal insulation films for textiles, such as clothing, jackets and other warm textiles. It can also be used as an outdoor heat-shielding material due to its advantage of high light transmittance. It can also be used in the applications of automobiles, buildings, doors and windows, etc.
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