Carbon nanotube (CNT) grafted with hyperbranched poly(amidoamine) (PAMAM) dendrimer (CNTD) were used as a multifunctional curing and composite agent of polyurethane (PU) terminated with epoxy units. Amino-functionalized CNT was used as the core for grafting the first generation of PAMAM dendrimer by sequential addition of methyl acrylate and ethylenediamine. Two different epoxy-terminated PUs (PUB and PU-PMDA) were prepared from the reaction of poly(ethylene glycol), excess amounts of hexamethylene diisocyanate, and different chain extenders (1,4-butanediol for PUB and pyromellitic dianhydride (PMDA) for PU-PMDA), and subsequent end group transformation of the isocyanate groups to epoxy functionalities using glycidol. Fourier transform infrared spectra and thermogravimetric analysis (TGA) results showed that CNTD was successfully prepared. TGA thermograms revealed that thermal decomposition of composites were carried out in two main steps related to the soft and hard segments. In addition, char content and thermal stability of the composites were increased with increasing the CNTD content. Most importantly, the PMDA chain extender resulted in high thermal stability of the epoxy-terminated PU composites. X-ray diffraction and scanning and transmission electron microscopies presented morphological and structural properties of nanotubes and hybrid composites.

接枝有超支化聚（酰胺基胺）（PAMAM）树枝状大分子（CNTD）的碳纳米管（CNT）用作多功能固化剂和以环氧单元为末端的聚氨酯（PU）复合剂。通过顺序添加丙烯酸甲酯和乙二胺，将氨基官能化的CNT用作接枝第一代PAMAM树状聚合物的核心。由聚乙二醇，过量的六亚甲基二异氰酸酯和不同的扩链剂（用于PUB的1,4-丁二醇和用于制备PPS的均苯四酸二酐（PMDA））的反应制备两种不同的环氧封端的PU（PUB和PU-PMDA）。 PU-PMDA），然后使用缩水甘油将异氰酸酯基的端基转化为环氧官能团。傅立叶变换红外光谱和热重分析（TGA）结果表明，成功制备了CNTD。TGA热分析图表明，复合材料的热分解是在与软链段和硬链段相关的两个主要步骤中进行的。另外，随着CNTD含量的增加，复合材料的炭含量和热稳定性也增加。最重要的是，PMDA扩链剂使环氧封端的PU复合材料具有很高的热稳定性。X射线衍射，扫描和透射电子显微镜显示了纳米管和杂化复合材料的形态和结构特性。PMDA扩链剂使环氧封端的PU复合材料具有较高的热稳定性。X射线衍射，扫描和透射电子显微镜显示了纳米管和杂化复合材料的形态和结构特性。PMDA扩链剂使环氧封端的PU复合材料具有较高的热稳定性。X射线衍射，扫描和透射电子显微镜显示了纳米管和杂化复合材料的形态和结构特性。