以St(O)ber和离心交换法制备了不同浓度的单分散SiO_2/PEG浓缩悬浮液,并研究了其流变性能和用其浸渍Kevlar编织布所得复合材料的防刺性能.研究发现,所制备浓缩悬浮液在质量浓度低于50%时,具有微弱的剪切增稠效应,增稠所能达到的粘度值随浓度增加缓慢升高,而临界剪切速率降低;当浓度在55%左右时,先是剪切增稠,随后出现轻微的剪切减稀现象;当浓度达到65%时,出现较为显著的剪切增稠效应.所制备复合材料的防刺性能比纯Kevlar编织布有一定的提高,当SiO_2质量百分比浓度在40%～45%区间时,抗刺力可提高到1.66倍左右.
Monodisperse concentrated suspensions of different concentrationon were prepared with St(O)ber method and centrifugation/solvent exchange procedure. The rheology behavior and the stab resistance of Kevlar fabrics impregnated with each concentration were studied. The results show that when the mass percent of prepared suspension is lower than 50%, suspension shows weak shear thickening behavior, which viscosity increases and critical shear rate reduces with increasing concentration; when it is about 55%, suspension shows shear thickening at first and then transfer to shear thining; when it is bigger than 65%, shear thinning comes first and then appears obviously shear thickening stab resistance of impregnated Kevlar fabrics improves at some extent, which is 1.66 times than that of pure Kevlar.
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