Synthesis and properties of octahedral silsesquioxane with vinyl acetate side group

Abstract A new type of octa polyhedral oligomeric silsesquioxane (Octa DMS-POSS) has been obtained. The synthesized Octa DMS-POSS is further modified with vinyl acetate in order to obtain a vinyl acetate-polyhedral oligomeric silsesquioxane (VAPOSS) with a better potential to absorb CO 2 . The effect of reaction temperature, reaction time, and solvent type is optimized by testing the product yield. The effect of vinyl acetate molar ratio on the crystalline, thermal stability, and contact angle is measured through the X-ray diffraction, differential scanning calorimeter, and contact angle tests. CO 2 adsorption measurements at 273.0 K were carried out in order to evaluate its potential application in CO 2 capture. Optimal preparation conditions are the reaction temperature 25 °C, reaction time 12 h, reaction solvent DMF. The highest yield is 80 %. The addition of VAc appears to interfere with the formation of new crystalline structures. As the VAc content increased, the melting temperatures showed an upward trend, and the contact angle first increased and then decreased slightly. The CO 2 uptakes VAPOSS3 were found to be 1.46 mmol⋅g −1 (6.42 wt%). As the molar ratio of VAc to POSS increased, the adsorption capacity increased.