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这是一篇关于化学降解PET制备新型塑化剂的文章，其研究目的是吸引人的。乙醇胺和PET反应得到单体BHETA这个反应对于作者来说并非首创，而且，对反应条件的探索上尚欠缺，例如胺解反应中，PET：EA的比例对反应的影响中，随着比例1：1，1：2.5到1：4，产率逐渐增大，是否应该探索一下继续升高PET：EA的比例对反应的影响呢?同样，当反应时间超过4h的时候，产率有什么变化?图1给出的反应方程式有严重的错误，在这个反应中是正庚酸的羧基脱去羟基。作者对图5，BHETA的DSC出现两个放热峰的解释并不充分，另外，我认为图9，BHETA的XRD与DSC的结果，也就是XRD的结果和BHETA的熔点没有必然的联系。综合来讲，作者完成的研究并不深入，很多地方缺乏科学性的论证。 [ Last edited by 板凳匪徒 on 2013-6-27 at 10:37 ] |
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hyt0615
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爱与雨下: 金币+1 2013-06-27 21:38:40
爱与雨下: 金币+1 2013-06-27 21:38:40
| Using the chemical degradation of PET to prepare new plasticizer was reported in this study, which is appealing. The reaction of ethanolamine and PET obtained BHETA monomer. But, this reaction is not the pioneer for the author. Moreover, the exploration of the reaction conditions is still lacking. For example, the influence of the ratio of PET and EA on the aminolysis reaction, as the ratio changed from 1:1 to 1:2.5 and 1:4, the yield was increased. If this ratio was further increased, what is the situation? Similarly, the reaction time exceeds 4 hours, what is the change of the yield? The reaction equation showed in the Figure 1 has a fatal error. It should be the hydroxyl removal of carboxyl of n-heptanoic acid. The explanations for the appearance of the two exothermic peaks in DSC of BHETA in Fig.5 were not sufficient. Also, I think XRD and DSC of BHETA in Fig.9, that is, the results of XRD and the melting point of BHETA is not necessarily linked. In summary, this study is not in-depth, and lack of scientific proof. |
2楼2013-06-27 20:43:37
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