纳米TiO_2对不饱和聚酯树脂包覆层的改性

Modification of Unsaturated Polyester Resin Inhibitor by Nano-TiO_2 Filler

针对U PR包覆层存在着固化物脆性大、低温延伸率低、与推进剂力学性能匹配差的缺点,提出将纳米T iO2均匀地分散在U PR基体中的共混改性方法,对U PR包覆层进行改性研究。拉伸性能测试结果表明,纳米T iO2对U PR包覆层的改性效果明显,其低温延伸率由2%提高到4%左右,同时降低了玻璃化转变温度,说明纳米T iO2可改善机体的力学性能,对U PR具有一定程度的增塑作用。通过SEM和TEM测试,对复合材料的微观性能结构进行研究,结果表明,纳米T iO2均匀分散于树脂基体中。

Although unsaturated polyester resin （UPR） inhibitor has many advantages, it also has some disadvantages, such as the large brittleness, the low elongation at low temperature （-40℃）, and the poor matching degree with the propellant in respect of mechanical property. So it is necessary to improve the mechanical property of UPR inhibitor via modification. The samples of UPR modified with nano-TiO2 filler has been thoroughly investigated through tensile test, DSC, TEM and SEM. The results indicate that the effect of nano- TiO2 filler on mechanical property of the inhibitor samples is obvious. The elongation at low temperature is increased from 2% to about 4%, and the glass transition temperature （Tg） is declined, which indicate that the nano-TiO2 filler has plasticization effect on UPR to some extent. The SEM and TEM photos of samples indicate that nano-TiO2 filler has been dispersed uniformly in resin matrix, besides a little filler has agglomerated softly.