摘要
以六亚甲基二异氰酸酯(HDI)或甲苯-2,4-二异氰酸酯(TDI)分别与不同相对分子质量的聚乙二醇(PEG)反应制备聚氨酯预聚体,再以预聚体对纳米SiO2进行表面接枝改性,将改性纳米SiO2分散到聚氨酯丙烯酸酯(PUA)中,光固化制备了PUA/SiO2纳米杂化涂层。场发射扫描电子显微镜和差示扫描量热法研究表明,与未改性的纳米SiO2相比,以聚氨酯分子链改性的纳米SiO2可显著提高与PUA树脂相容性及杂化涂层的热稳定性能。以摆杆阻尼试验仪及漆膜冲击器研究了杂化涂层的力学性能,研究表明通过调整预聚体的分子链结构可在提高杂化涂层硬度的同时,不损失涂层的冲击性能。
Polyurethane prepolymers, prepared by the reaction of hexamethylene diisocyanate （HDI） or toluene-2, 4-diisocyanate （TDI） with different molecular weight of polyethylene glycol （PEG）, were grafted onto the surface of nanoSiO2 to obtain polyurethane-modified nano-SiCh. The modified nano-SiO2 was dispersed into polyurethane acrylate （PUA） resin and cured by UV light to achieve nanohybrid coatings. The results of field-emission scanning electron microscope （FE-SEM） and differential scanning calorimetry （DSC） analysis indicate that the nano-SiO2 modified with polyurethane chain, compared with the unmodified one, can significantly improve the compatibility between nanoparticle and resin, as well as the thermal stability of nanohybrid coatings. Pendulum damping tester and film impactor were used to investigate the mechanical properties of nanohybrid coatings. The results indicate the hardness of the hybrid coating, without the expense of impact resistance, can be increased through adjusting the structure of prepolymer chain.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2016年第3期92-95,101,共5页
Polymer Materials Science & Engineering
基金
江苏省高校自然科学研究重大项目(11KJA430010)
江苏省"青蓝工程"(学科带头人)
江苏省生态环境重点实验室开放项目(EML201205)
