乙二胺化氧化石墨烯-羟基硅油/超支化聚氨酯三元复合材料的制备与性能

Preparation and properties of ethylenediamined graphene oxide-hydroxyl silicone/hyperbranched polyurethane ternary composites

采用乙二胺部分还原修饰氧化石墨烯(GO)获得EGO,并将其作为改性剂。以异氟尔酮二异氰酸酯、聚醚二元醇、羟基硅油(HPMS)和二羟甲基丙酸等主要原料合成含硅线性聚氨酯(HPMS/LPU),然后将其接枝在实验室自制多羟基超支化聚氨酯核(HBPU-0)上,最后与EGO反应,制备了乙二胺化GO改性的含硅超支化聚氨酯(EGO-HPMS/HBPU)。利用FTIR、Raman、XRD、XPS、TEM、AFM、SEM和TG等分别对EGO-HPMS/HBPU三元复合乳液及其胶膜的形貌和性能进行了表征,并研究了EGO和羟基硅油含量对EGO-HPMS/HBPU复合材料综合性能的影响。结果表明,当添加0.5wt%EGO且变量为HPMS时,EGO在聚氨酯基体中稳定分散,与单一改性材料相比,其协同改性复合材料EGO-4wt%HPMS/HBPU综合性质最佳,此时,其不同失重条件下热解温度的提高展示材料良好的稳定性,24h吸水率降至5.13%,水接触角为101.3°,EGO-4wt%HPMS/HBPU的拉伸强度与断裂伸长率分别为11.18 MPa和553.2%,获得了疏水、手感光滑柔软的复合产品。

Graphene oxide（GO）was partially modified with ethylenediamine to obtain EGO,used as a modifier.Linear polyurethane containing silicone was firstly synthesized,using isophorone diisocyanate,polyether diol,hydroxyl silicone（HPMS） and dimethylol propionic acid as the main raw materials,then it was grafted onto the polyhydroxy hyperbranched polyurethane core（HBPU-0） from laboratory homemade,and finally it reacted with EGO to prepare ethanediamined GO/hyperbranched polyurethane containing silicone（EGO-HPMS/HBPU）.The morphology and properties of the ethylenediamined GO-hydroxyl silicone/hyperbranched polyurethane composite emulsion and its films were characterized by FTIR,Raman,XRD,XPS,TEM,AFM,SEM and TG,and the effects of the contents of EGO and hydroxyl silicone oil on EGO-HPMS/HBPU composite properties were studied.The results show that EGO is stably dispersed in HBPU matrix when the amount of HPMS is 4wt%and EGO is 0.5wt%.Compared with the single modified material,the properties of the synergistic modified EGO-4wt%HPMS/HBPU composites are the best.The increase of the pyrolysis temperature under different mass loss displays the good stability of the material,and the 24 h water absorption reduces to 5.13%,and the water contact angle is 101.3°.The tensile strength and elongation at break of EGO-4wt%HPMS/HBPU are 11.18MPa and 553.2%,respectively,to get hy-drophobic and feeling smooth and soft composite products.