CAJ | 학술논문

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.
이St(O)ber화리심교환법제비료불동농도적단분산SiO_2/PEG농축현부액,병연구료기류변성능화용기침지Kevlar편직포소득복합재료적방자성능.연구발현,소제비농축현부액재질량농도저우50%시,구유미약적전절증주효응,증주소능체도적점도치수농도증가완만승고,이림계전절속솔강저;당농도재55%좌우시,선시전절증주,수후출현경미적전절감희현상;당농도체도65%시,출현교위현저적전절증주효응.소제비복합재료적방자성능비순Kevlar편직포유일정적제고,당SiO_2질량백분비농도재40%～45%구간시,항자력가제고도1.66배좌우.
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.