In this contribution, we reported the preparation of vitrimers by using commodity thermoplastics via post crosslinking with hindered urea bonds (HUBs). First, three hindered urea diisocyanates (HUDIs) were synthesized via the reactions of N,N’-di-tert-butylethylenediamine, N,N’-diethylethylenediamine, and piperazine with isophorone diisocyanate (IPDI). Thereafter, these HUDIs were used as the crosslinking agents to crosslink poly(hydroxyether of bisphenol A) (PH), a commodity thermoplastics. Fourier transform infrared (FTIR) spectroscopy and dynamic mechanical thermal analyses (DMTA) indicated that the PH thermosets were successfully obtained. It was found that the thermosets displayed the behavior of vitrimers. The PH thermosets can be reprocessed at elevated temperature without using catalyst and the mechanical strengths of vitrimers were recovered as high as 95%. The reprocessing properties are attributable to dynamic exchange reaction of hindered urea bonds, contingent on types of hindered urea bonds.

在这项贡献中，我们报道了使用商品热塑性塑料通过受阻脲键（HUB）后交联来制备微粉的方法。首先，通过N， N'-二叔丁基乙二胺，N，N的反应合成了三种受阻脲二异氰酸酯（HUDI）。-二乙基乙二胺和哌嗪与异佛尔酮二异氰酸酯（IPDI）。此后，将这些HUDI用作交联剂以使双酚A的聚羟基醚（PH）（一种商品热塑性塑料）交联。傅里叶变换红外（FTIR）光谱和动态机械热分析（DMTA）表明成功地获得了PH热固性材料。已经发现，热固性塑料表现出了三聚体的行为。PH热固性塑料可以在不使用催化剂的情况下在高温下进行后处理，并且可回收高达95％的三聚体机械强度。后处理性能归因于受阻脲键的动态交换反应，取决于受阻脲键的类型。