Abstract Herein, two sets of shape memory polyurethane (PU) nanocomposites comprising 3 and 1 wt% of reduced graphene oxide and reduced octadecyl isocyanate-functionalized graphene oxide nanosheets (named as RGO and R (GO-ISO), respectively) were fabricated by solution casting approach. Fourier transform infrared (FTIR) analysis verified linking of octadecyl isocyanate to GO nanosheets via addition reaction of NCO groups with OH and COOH groups and formation of urethane and amide functionalities. The grafting content was determined through thermal gravimetric analysis (TGA), which was about 15 wt% of R (GO-ISO) nanosheets. The appropriate dispersion of R (GO-ISO) nanosheets compared to R (GO) nanosheets in PU was studied by field emission scanning electron microscopy (FE-SEM). Additionally, better distribution level of R (GO-ISO) nanosheets caused PU/R (GO-ISO) nanocomposites to possess greater modulus and lower elongation at break than PU/RGO nanocomposites. Moreover, PU/R (GO-ISO) nanocomposites showed greater shape memory fixities, due to more effective stress transfer of R (GO-ISO) nanosheets than that of RGO nanosheets.

中文翻译：

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还原十八烷基异氰酸酯官能化氧化石墨烯纳米片的合成及其对聚氨酯纳米复合材料物理、机械和形状记忆性能的影响

摘要 在此，通过溶液制备了两组形状记忆聚氨酯 (PU) 纳米复合材料，分别包含 3 和 1 wt% 的还原氧化石墨烯和还原异氰酸十八烷基官能化氧化石墨烯纳米片（分别命名为 RGO 和 R (GO-ISO)）。铸造方法。傅里叶变换红外 (FTIR) 分析证实了异氰酸十八烷基酯通过 NCO 基团与 OH 和 COOH 基团的加成反应以及氨基甲酸酯和酰胺官能团的形成连接到 GO 纳米片。接枝含量通过热重分析 (TGA) 确定，约为 R (GO-ISO) 纳米片的 15 wt%。通过场发射扫描电子显微镜 (FE-SEM) 研究了 R (GO-ISO) 纳米片与 R (GO) 纳米片在 PU 中的适当分散。此外，R (GO-ISO) 纳米片更好的分布水平导致 PU/R (GO-ISO) 纳米复合材料比 PU/RGO 纳米复合材料具有更大的模量和更低的断裂伸长率。此外，由于 R (GO-ISO) 纳米片比 RGO 纳米片更有效的应力转移，PU/R (GO-ISO) 纳米复合材料显示出更大的形状记忆固定性。