基于迪尔斯-阿尔德反应的聚乙二醇自修复材料的制备

Preparation of Shelf-Healing Polyethylene Glycol Based on Diles-Alder Reaction

合成了呋喃封端的聚乙二醇(F-PEG-F)和含有3个马来酰亚胺官能团的小分子交联剂三(2-马来酰亚胺基乙基)胺(TMEA)。用傅里叶变换红外光谱、核磁分析表征了产物结构。通过F-PEG-F和TMEA反应制备了具有可再加工性能及自修复性能的交联聚合物材料。由于迪尔斯-阿尔德(Diels-Alder,DA)反应的动态可逆性,样品在100℃时发生逆DA(Retro-DA)反应,交联结构破坏。材料损伤后由超景深三维显微镜观察到破坏部位成功愈合,实现了自修复。此外,随着交联剂含量增加,材料拉伸强度有所提高;随着PEG相对分子质量提高,拉伸强度略微下降。当聚乙二醇相对分子质量为6000,交联含量为45%时,拉伸强度达到1.27 MPa,断裂伸长率为44%,60℃时修复率可达到90%。

Furan functionalized polyethylene glycol （F-PEG-F） and tris（2-maleimdoethyl） amine （TMEA） were synthesized. The products were characterized by IR, 1H-NMR. The crosslinking materials were prepared, and their solubility, reprocessing property and shelf-healing performance were tested. Because of the dynamic reversibility of Diels-Alder （DA）reaction, the samples just swell below 80℃, but dissolve at 100 12 in N, N-dimethylformamide （DMF）. This material shows good reprocessing ability also due to the dynamic property of DA reaction. The 3D image shows that the incision repairs at a relatively low temperature, demonstrating this material also has good shelf- healing property. In addition, with increase of the crosslinking agent content, tensile strength of the material increases; and with increase of PEG molecular weight, tensile strength decreases slightly. When the molecular weight of polyethylene glycol is 6000, crosslinking content is 45 %, the tensile strength of the material is 1.27 MPa, the elongation at break is 44 %. At 60 12, the repair rate can reach 90 %.