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胡程耀

铁杆木虫 (著名写手)

[求助] 环氧树脂和大分子量聚醚胺之间的反应,需要催化剂吗? 已有1人参与

聚醚胺D4000为近末端含胺基的长链二胺,按照2015的一篇Macromolecules (2015, 48, 7495−7502)的文章,与环氧树脂在80度反应,他们是用的近红外光谱检测固化过程,发现在20个小时固化度为70%,但是我们一样的条件,直接将环氧树脂和聚醚胺D4000共混反应,但是在80度反应24个小时,还是颜色不怎么变,用中远红外检测,发现环氧树脂基团变化不大,请高手赐教,是否需要加催化剂,加什么催化剂,加多少呢?
文献原话:
PRS was produced by adding/mixing stoichiometric blends of PPODA(Jeffamine D-4000) and DGEBA at 80 °C. The chemical conversion of these
mixtures was monitored using a Nexus 870 FTIR spectrometer (Thermo Nicolet Corp.) in the near-IR region. Figure 2a shows representative FTIR spectra taken over a period of time for this reaction. The peak at 4530 cm−1 corresponds to the stretching and bending of oxirane bands, and the peak at 4930 cm−1 corresponds to the NH2 combination bands.19,20 The decrease of epoxy and amine concentrations signifies the presence of epoxy−amine reactions. Figure 2b shows the fractional conversion of epoxy with respect to time obtained using the epoxy peak area. Additionally, the approximate gel point was measured using a steady shear viscosity measurement during curing reactions using a TA rheometer apparatus AR2000. Gelation is known to happen at the point where steady shear viscosity rises rapidly
to infinity.21 A combined viscosity−conversion measurement on DGEBA−PPODA systems at 80 °C showed that the approximate gel point for these systems is taking place at around 84% oxirane conversion.
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dedaji

铁杆木虫 (著名写手)

穷尽一生做完一场梦

80℃要是不行就直接100℃吧,要是用催化剂,一般会用DMP-30,但是这个会发黄,用N 〔〕AEP

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2楼2016-12-04 11:04:11
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zj34331197

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胡程耀: 金币+5, 有帮助 2017-03-03 14:15:59
胡程耀: 金币+5, 有帮助 2017-03-03 14:16:38
环氧树脂是那种型号呢。聚醚胺和环氧基团在80℃是可以反应的。
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3楼2016-12-08 10:46:39
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zj34331197

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胡程耀: 金币+5, 有帮助 2017-03-03 14:15:52
你可以用DSC测试下起始固化反应的温度,根据DSC测试结果制订固化工艺。
路漫漫其修远兮
4楼2016-12-08 10:47:18
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