Wu Ze, Zhang Lei, Li Ji, Zhao Xiaolu, Yang Chunhui
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology Harbin 150001 China
RSC Adv. 2018 Feb 2;8(11):5695-5701. doi: 10.1039/c7ra13165h.
hydrophobic polypropylsilsesquioxane aerogels (PSAs) were successfully synthesized an organic-inorganic hybridization method by a sol-gel process, in which propyltriethoxysilane (PTES) and tetraethylorthosilicate (TEOS) were used as co-precursors. Si NMR and FTIR analyses indicated the high degree of condensation of the precursors and proved the attachment of propyl (-CH) groups in PSAs, respectively. By means of incorporating propyl groups, both mechanical robustness and hydrophobicity were obtained. Meanwhile, the mechanical strength, contact angle and density obviously increased with the increase in propyl groups. Under optimized conditions, as-prepared PSA could endure up to a 70% maximum linear compression with few cracks. Benefiting from the robust structure and hydrophobicity, PSAs showed high absorption capacities (8-10 times that of its own weight) and fast absorption properties (<20 s) for a wide range of organic solvents and could be reused at least 5 times.
通过溶胶 - 凝胶法，采用有机 - 无机杂化方法成功合成了疏水性聚丙基倍半硅氧烷气凝胶（PSA），其中丙基三乙氧基硅烷（PTES）和正硅酸乙酯（TEOS）用作共前驱体。硅核磁共振（Si NMR）和傅里叶变换红外光谱（FTIR）分析分别表明前驱体的高度缩合以及证明了PSA中丙基（-CH）基团的连接。通过引入丙基，获得了机械强度和疏水性。同时，机械强度、接触角和密度随着丙基数量的增加而明显增加。在优化条件下，所制备的PSA能够承受高达70%的最大线性压缩且几乎没有裂缝。受益于坚固的结构和疏水性，PSA对多种有机溶剂表现出高吸收容量（为自身重量的8 - 10倍）和快速吸收特性（<20秒），并且可以重复使用至少5次。
