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hujinyang木虫 (正式写手)
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[求助]
二氧化硅基杂化玻璃中用到的聚四氟乙烯模具
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比如这篇文献中提到的PTFE模具，一般尺寸和形状是多少？有知道的请告知，重谢！！！ Preparation of Materials; Typical Procedure for the Preparation of Grafted Hybrids: In procedure (c), the materials were prepared by using MTEOS as starting precursor hydrolyzed in acidic medium (H2O, HCl or AcOH, PH=2.5) in the presence of ethanol (molar ratio EtOH/MTEOS=3). The hydrolysis molar ratio water/precursor was 3. The mixture was stirred overnight and evaporated to the initial volume of precursor. APTES solution in ethanol was added to neutralize the sol. In the second step, the dyes were added to the sol as a solution in THF with the desired concentration. Addition of H2O (pH 2.6) and stirring of the mixture during 7 days was necessary to achieve hydrolysis and condensation of the chromophore with the matrix and prevent precipitation of the dye during the drying step. After aging was finished, the gels were dried between 70 and 110 oC in PTFE moulds. The volume after shrinkage was approximately half of the original volume. |
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