<br>4-APN的聚合机理及新型邻苯二甲腈树脂聚合催化剂,RSC Advances

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4-APN的聚合机理及新型邻苯二甲腈树脂聚合催化剂
RSC Advances ( IF 3.9 ) Pub Date : 2020-10-26 , DOI: 10.1039/d0ra07581g
Liping Sheng ₁ , Kerui Xiang ₁ , Rong Qiu ₁ , Yuxuan Wang ₁ , Shengpei Su ₁ , Dulin Yin ₁ , Yongming Chen ₂

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邻苯二甲腈（PN）树脂聚合中广泛使用的催化剂是含有-NH ₂的芳香族化合物，因为它们具有较高的催化性能。然而，这些催化剂的催化机理还不是很清楚。为了了解其机理，本文对广泛使用的自催化催化剂4-(4-氨基苯氧基)-邻苯二甲腈(4-APN)进行了研究。采用多用途方法跟踪4-APN的聚合过程，并首次在交联过程中检测到氨气。结合4-APN固化过程的在线红外分析结果，新提出了氨生成的机理。基于这一机理，提出了一种不同于传统PN树脂聚合催化剂选择方法的新催化剂选择策略。根据新策略，选择1,3-二亚氨基异吲哚啉（1,3-DII）作为新型催化剂。结果表明，新型催化剂不仅能有效催化PN树脂的聚合，而且具有比有机胺催化剂更低的固化温度，并能消除氨气的释放和由此引起的制品中的空隙。因此，本研究结果将对PN催化剂的研制和PN的发展提供重要启示。

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Polymerization mechanism of 4-APN and a new catalyst for phthalonitrile resin polymerization

The widely used catalysts for phthalonitrile (PN) resin polymerization are aromatic compounds containing –NH₂ because of their high catalytic performances. However, the catalytic mechanisms of these catalysts are not very clear. To understand the mechanisms of them, the widely used autocatalytic catalyst 4-(4-aminophenoxy)-phthalonitrile (4-APN) was studied in this paper. The polymerization process of 4-APN was tracked by a multi-purpose method, and ammonia gas was detected during the cross-linking processing for the fist time. Combined with the online IR results of the curing process of 4-APN, the mechanism of ammonia generation was newly proposed. Based on this mechanism, a new catalyst selection strategy was promoted, which is different from the traditional approach to catalyst selection for PN resin polymerization. According to the new strategy, 1,3-diiminoisoindoline (1,3-DII) was selected as a novel catalyst. The results showed that the new catalyst could not only effectively catalyze the polymerization of PN resin, but also has a lower curing temperature than that of organic amine catalysts and can eliminate the release of ammonia gas and the voids in the products caused thereby. Therefore, the results of this study will give important enlightenment to the development of PN catalysts and the development of PN.

更新日期：2020-10-26

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