软段含侧链烷烃的聚氨酯/纳米TiO2杂化材料的制备

Preparation of Polyurethane/Nano-TiO2 Hybrid Materials Containing Alkyl Side Chains in Soft Segments

通过单硬脂酸甘油酯(GMS)与丁二酸酐反应,合成了两种结构明确的带有C-18侧链的梳状聚酯二元醇(GS)。以二苯基甲烷二异氰酸酯(MDI)、1,4-丁二醇(BDO)和GS为原料,合成得到了软段带有C-18侧链的端NCO聚氨酯(PUGS);PUGS进一步与纳米TiO2复合制得聚氨酯/纳米TiO2杂化材料(PUGS-Ti)。用1H-NMR、FT-IR、DSC、WAXD、SEM、AFM和接触角测量仪对PUGS及其杂化材料的表面形貌和性能进行了表征,考察了侧链烷烃含量和TiO2的用量对PUGS及其杂化材料表面性能的影响。结果表明,PUGS结构中的侧链烷烃显著降低了表面能,提高了水在其表面的接触角。在PUGS-Ti中,通过调控侧链烷烃含量和TiO2的用量,可以有效调节材料的表面能,实现表面的超疏水性。

Two well-defined comb-like polyester diols(GS)with C-18 side chains were synthesized by reacting glyceryl monostearate(GMS)with succinic anhydride.NCO-terminated polyurethane prepolymers(PUGS)with C-18 side chains in soft segment structure were synthesized from diphenylmethane diisocyanate(MDI),1,4-butanediol(BDO)and GS.Then polyurethane hybrid materials(PUGS-Ti)were further prepared by mixing with nano-TiO2.The structures of GS and PUGS were characterized by 1H-NMR and FT-IR.The crystallization behavior,surface morphology and surface contact angle of the prepared PUGS and its hybrid material were characterized by DSC,WAXD,SEM,AFM and water contact angle measurements.The effects of alkyl side chain content and the amount of TiO2 on the surface properties of PUGS and its hybrid material were investigated.Results showed that the introduction of non-polar alkyl side chains into the polyurethane could significantly reduce the surface energy and improve the contact angles of water on the surface.In PUGS-Ti,the surface energy of the materials could be effectively adjusted to achieve superhydrophobicity of the surface by adjusting the content of soft segments(the number of alkyl side chains)and the amount of TiO2 in the structure.