3的存在將引起短鏈或環(huán)狀Si–O–Si結構,造成顆粒團聚,產(chǎn)生沉淀,引起相分離。控制凝膠時間與相分離時間的關系,可獲得均勻凝膠。"/>

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聚甲基硅倍半氧烷氣凝膠的制備及相分離控制研究
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哈爾濱工業(yè)大學特種環(huán)境復合材料技術國防科技重點實驗室,哈爾濱工業(yè)大學特種環(huán)境復合材料技術國防科技重點實驗室,哈爾濱工業(yè)大學特種環(huán)境復合材料技術國防科技重點實驗室,哈爾濱工業(yè)大學特種環(huán)境復合材料技術國防科技重點實驗室,哈爾濱工業(yè)大學特種環(huán)境復合材料技術國防科技重點實驗室

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特種環(huán)境復合材料技術國防科技重點實驗室開放基金資助(項目號9140C490208140C49003)


The Synthesis of Polymethylsilsesquioxane (PMSQ) Aerogels and the Control ofPhase Separation
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Key Laboratory of Science and Technology on Advanced Composites in Special Environments,Harbin Institute of Technology,Key Laboratory of Science and Technology on Advanced Composites in Special Environments,Harbin Institute of Technology,Key Laboratory of Science and Technology on Advanced Composites in Special Environments,Harbin Institute of Technology,Key Laboratory of Science and Technology on Advanced Composites in Special Environments,Harbin Institute of Technology,Key Laboratory of Science and Technology on Advanced Composites in Special Environments,Harbin Institute of Technology

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    摘要:

    以甲基三甲氧基硅烷(methyltrimethoxysilane, MTMS)為先驅(qū)體、二甲基亞砜(dimethylsulfoxide, DMSO)為溶劑,采用溶膠—凝膠法和超臨界干燥技術制備了聚甲基硅倍半氧烷(polymethylsilsesquioxane, PMSQ)氣凝膠。通過改變堿性催化劑氨水和DMSO的相對含量用量,獲得了PMSQ凝膠時間的變化規(guī)律。PMSQ氣凝膠具有典型的納米多孔結構。凝膠時間隨氨水用量的增加而縮短,隨DMSO用量的增加而延長。DMSO含量越多,溶膠粘度變化越緩慢；氨水含量越多,粘度變化越快。不可水解基團–CH3的存在將引起短鏈或環(huán)狀Si–O–Si結構,造成顆粒團聚,產(chǎn)生沉淀,引起相分離?？刂颇z時間與相分離時間的關系,可獲得均勻凝膠。

    Abstract:

    Polymethylsilsesquioxane (PMSQ) aerogels were synthesized by using methyltrimethoxysilane (MTMS) as precursor and dimethyl sulfoxide (DMSO) as solvent via sol-gel method and supercritical drying. The laws of gelation times of PMSQ aerogels were discussed by changing the amount of ammonium hydroxide (AH) and DMSO. PMSQ aerogels possess typical nano-porous structures. The gelation time is shortened by the increase of amount of AH, but is extended by the increase of amount of DMSO. As the DMSO content increases, the viscosity changeSis retarded, whereas the increase of AH results in the acceleration of the viscosity change. The short or circle Si–O–Si linkages are generated because of the influence of theSunhydrolyzed –CH3 groups, which causes the aggregates of particles and phase separation. The uniform gels can be obtained by controlling the relationships between gelation time and the time of phase separation.

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何飛,方旻翰,張鑫,周糧,赫曉東.聚甲基硅倍半氧烷氣凝膠的制備及相分離控制研究[J].稀有金屬材料與工程,2018,47(S2):262~266.[He Fei, Fang Minhan, Zhang Xin, Zhou Liang, He Xiaodong. The Synthesis of Polymethylsilsesquioxane (PMSQ) Aerogels and the Control ofPhase Separation[J]. Rare Metal Materials and Engineering,2018,47(S2):262~266.]
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  • 收稿日期:2018-01-15
  • 最后修改日期:2018-08-27
  • 錄用日期:2018-02-01
  • 在線發(fā)布日期: 2018-11-01
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