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- 저자 : Litian Hu (검색결과 1 건)
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Peng Ding,Wenhui Cao,Qi Ding,Chaobin Liu,Ruochong Zhang,Litian Hu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-
Understanding the thickening mechanisms of grease thickeners can provide critical insight into thedesign of lubricating greases. Polyurea (PU), as an important thickening system with diverse structures,the role of thickener structure in the thickening mechanism is not clearly elucidated. In this study, twotypes of PU thickeners, which have the structures of helical fibers and nanotubes, were synthesized,respectively. Via a quantitative analysis in the rheological characteristics of the two PU thickeners, itwas found that the PU with helical fibers structure possess higher thickening capacity and more obviousshear-thinning effect, while the one with nanotubes structure is more effective to improve the elasticityand structural stability of grease. Based on the rheological characteristics and structural features of thetwo PU thickeners, the role of structure in the thickening mechanism of PU was discussed. The proposedmechanisms explain why the commercial PU greases commonly have a complex thickening system thathas both fibrous clusters and nanotube structures.
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