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[求助]
关于聚合物合成的装置问题 已有2人参与
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The sample was placed in a Pyrex cell, equipped with a vacuum stopcock and ground-glass joints. The sample was subsequently subjected to three freeze–vacuum–thaw cycles using a dry ice/acetone trap, to remove dissolved air and residual dichloromethane. 这个部分在什么装置里完成，是冷冻干燥？好像冷冻干燥不需要 dry ice/acetone trap吧！ The sample was placed in a Pyrex cell, equipped with a vacuum stopcock and ground-glass joints. The sample was subsequently subjected to three freeze–vacuum–thaw cycles using a dry ice/acetone trap, to remove dissolved air and residual dichloromethane. The sample cell was maintained for 6 h at 35 C, to achieve a uniform distribution of organic monomers prior to polymerization. The following temperature scheme was used for polymerization: 4 h at 60 C, 1h at 80 C, and finally 1 h at 150 C. 这一部分是都在上面那个装置完成的还是完成上一步后，再做下一步。不是很理解 |
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2楼2016-08-28 17:26:22
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3楼2016-08-29 06:55:06