Title Page
Contents
Abstract 9
Ⅰ. Introduction 10
Ⅱ. Experimental 12
2.1. Materials 12
2.2. Preparation of PU-PDMS hybrid foam 14
2.3. Characterization 16
Ⅲ. Results and discussion 17
3.1. TEM characterization 17
3.2. Synthesis of PU-PDMS hybrid foam 19
3.3. Physical properties of PU-PDMS hybrid foam with different type of PBA 24
Ⅳ. Conclusion 28
Ⅴ. Reference 29
Table 1. Properties of hydrocarbon-based physical blowing agents. 13
Table 2. Properties of TEM. 13
Table 3. Formulation of PU-PDMS hybrid foam with various blowing agents. 15
Figure 1. Schematic illustration of preparation of PU-PDMS hybrid foam. 15
Figure 2. SEM microphotographs of TEM : (a) initial state, (b) after expansion at 100 °C. 18
Figure 3. TGA curves of TEM from 30 °C to 500 °C. 18
Figure 4. Digital photographs of PU-PDMS hybrid foam with hydrocarbon-based PBA. Scale bar, 375 mm and 500 mm. 20
Figure 5. Digital photographs of PU-PDMS hybrid foam with TEM. Scale bar, 375 mm and 500 mm. 20
Figure 6. FT-IR spectra of TEM, neat foam, HEX, CHEX, and TEMF. 21
Figure 7. OM (Optical microscopy) and SEM image of pore. 23
Figure 8. Physical properties of hybrid foam with different types and content of blowing agents (a) average pore size (b) apparent density (c) thermal conductivity. 25
Figure 9. Physical properties of hybrid foam with different content of TEM (a) average pore size and apparent density (b) thermal conductivity. 27