the enhancement of mechanical strength and specific gravity of silicone foam filled with poly tannic acid

초록

Silicone foams with poly(TA) were prepared and characterized in terms of morphological, mechanical properties, and specific gravity. SEM, EDS and TGA methods were applied to analyze the synthesized silicone foams systematically. An addition of high content (2 wt.%) of poly(TA) contributed the increase in expansion ratio and reduction of specific gravity of the silicone foam. In addition, an enhancement of Young’s modulus and tensile strength was accomplished by addition of poly(TA). This work demonstrates that the reason for is the chemical reaction formed between plenty hydroxyl functional groups in the poly(TA) and the hydride-terminated polydimethylsiloxane (PDMS). The quantity of the hydroxy-terminated PDMS was decreased on account of the added hydroxyl group of poly(TA). Hence, vinyl-terminated PDMS could be readily crosslinked with hydride-terminated PDMS. As a consequence, the mechanical properties could be sustained with the reduction of specific density.