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The values are relatively high when compared with the B-a/epoxy thermoset, which possesses 5% degradation temperature at 302-309, dependent on the curing catalyst [32]. Unlike the curing of neat ( 6) (Fig. 2), the characteristic peaks of oxazine did not disappear completely in the ( 6)/DCPDE system after curing at 220 C for 20 min, suggesting a slower curing rate. The carbonyl signal, which was not seen after 140 C treatment, supports the formation of cyclic amide. In contrast to the good solubility of ( 6), preparing benzoxazine ( 7) in chloroform (Run 8) and toluene/ethanol (Runs 9e10) results in powder precipitate (not gelation) after 1 h due to the poor solubility of ( 7), which limits the purity of ( 7). |
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朱巖0308: 金幣+8, 翻譯EPI+1, ★★★★★最佳答案 2015-03-06 10:06:51
朱巖0308: 金幣+8, 翻譯EPI+1, ★★★★★最佳答案 2015-03-06 10:06:51
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The values are relatively high when compared with the B-a/epoxy thermoset, which possesses 5% degradation temperature at 302-309, dependent on the curing catalyst [32]. 與B-a/環(huán)氧熱凝物相比，這些數(shù)值相對(duì)較高。 在固化促進(jìn)劑的作用下，B-a/環(huán)氧熱凝物在302-309度的溫度區(qū)間，發(fā)生5%的熱降解。 Unlike the curing of neat ( 6) (Fig. 2), the characteristic peaks of oxazine did not disappear completely in the ( 6)/DCPDE system after curing at 220 C for 20 min, suggesting a slower curing rate. 與圖2中整齊固化不同的是，在220攝氏度的環(huán)境中，經(jīng)過(guò)20分鐘的固化后，惡嗪的特征峰不會(huì)從DCPDE 系統(tǒng)中完全消失。 The carbonyl signal, which was not seen after 140 C treatment, supports the formation of cyclic amide. 羰基信號(hào)（在經(jīng)過(guò)140攝氏度的熱處理后會(huì)消失，或者不可見(jiàn)）能促進(jìn)環(huán)酰胺的形成。 In contrast to the good solubility of ( 6), preparing benzoxazine ( 7) in chloroform (Run 8) and toluene/ethanol (Runs 9e10) results in powder precipitate (not gelation) after 1 h due to the poor solubility of ( 7), which limits the purity of ( 7). 與（6）良好的溶解度形成對(duì)比的是， 在氯仿（Run 8）和甲苯/乙醇（Runs 9e10)中，制備苯并惡嗪，會(huì)在1小時(shí)后， 由于（7）的溶解度較差，產(chǎn)生粉末沉淀物（非膠凝態(tài)），這制約了（7）純度的提升。 |
2樓2015-03-06 09:51:52
3樓2015-03-06 10:07:31
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