1. Two series of thermotropic liquid crystalline polyureas were synthesized by the copolymerization of benzidine (or o-tolidine),1,6-hexane diamine and 2,4-toluene diisocyanate.
   为合成新型热致液晶聚脲，以含液晶基元的联苯二胺（或联邻甲苯胺）、1，6-己二胺、2，4-甲苯二异氰酸酯为原料进行合成。
2. So, as the complement for the bimaceral polyurea, the single-polyurea has the wide application foreground in the anti-crash and anti-seepage in the hydropower project.
   作为双组分聚脲施工技术的补充，单组分聚脲在水利水电工程中混凝土抗冲磨及防渗等方面具有广泛的应用前景。
3. Unlike traditional latex or acrylic coatings, polyurea, as a suitable waterproofer even under seawater immersion, is in no way influenced by ponding water, which is very often on existing roofs.
   优于丙烯酸防水涂料的主要一点是聚脲的耐积水性能，而屋面积水在国内非常普遍。

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