Epoxy polymers composed of bisphenol A (BPA) and epichlorohydrin (ECH) were grafted onto polyurethane (PU) using the graft-polymerization method to prepare the epoxy PU hybrid polymer. The main series contained the epoxy polymer grafted onto PU; however, the epoxy polymer was not bound to PU in the control series. The breaking tensile stress steeply increased at low BPA and ECH contents and then decreased as more BPA and ECH were included in the main series, whereas the control series did not display an incline in the breaking tensile stress irrespective of the BPA and ECH contents. The percent shape recovery also steeply increased after the grafting of epoxy polymer in the main series but increased at a slower rate in the control series. The flexibility of the main series at a freezing temperature was not enhanced compared with the plain PU because the grafted epoxy polymers did not effectively disrupt the molecular interaction between PUs. Therefore, the grafting of epoxy polymers noticeably enhanced the breaking tensile strength and percent shape recovery of PU.

使用接枝聚合方法将由双酚A（BPA）和环氧氯丙烷（ECH）组成的环氧聚合物接枝到聚氨酯（PU）上，制备环氧PU杂化聚合物。主要系列包括接枝到PU上的环氧聚合物；然而，在对照系列中，环氧聚合物没有结合到PU上。在低BPA和ECH含量下，断裂拉伸应力急剧增加，然后随着主要系列中包含更多的BPA和ECH而下降，而对照系列则与BPA和ECH含量无关，其断裂拉伸应力均未显示倾斜。在主要系列中接枝环氧聚合物后，形状回复百分数也急剧增加，但在对照系列中则以较慢的速率增加。与普通的PU相比，在冷冻温度下主系列的柔韧性没有增强，因为接枝的环氧聚合物不能有效地破坏PU之间的分子相互作用。因此，环氧聚合物的接枝显着提高了PU的断裂拉伸强度和百分形状恢复率。