共查询到19条相似文献,搜索用时 109 毫秒
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通过双螺杆挤出工艺制备了不同配方的炭黑母料。研究了炭黑的添加、 聚乙烯的用量以及剪切速率对聚乙烯加工系流变性能的影响。结果表明,通过流变性能的变化规律可以研究炭黑在聚乙烯中的分散情况,在剪切过程中,聚乙烯熔体的剪切应力越大,炭墨在其中的分散性能越好。 相似文献
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润滑剂YI对聚氯乙烯塑料流变性能的影响 总被引:3,自引:0,他引:3
采用毛细管流变仪,考察润滑剂YI用量对PVC流变性能的影响。实验表明,流体非牛顿指数n<1,并随YI用量增加而下降。YI使PVC熔体粘度大幅度减少,在硬质PVC中,YI用量在0.6~1.0PHR作用最明显;在软质PVC中,当剪切速率γ>500s-1时,少量YI就能使熔体粘度下降。并测定了不同YI用量PVC的流动活化能,随YI用量增加,Eη略有下降,切应力对Eη影响不明显 相似文献
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研究了润肤露的流变性能,并考察了其流变性能对使用的影响。结果表明,润肤露乳液在很宽的剪切速率范围(0.005s^-1~3000S^-1)内具有显的剪切变稀特性,用幂律定律拟合得到流动指数为0.18。同时发现该润肤露呈现轻度交联体系特征;在预剪切停止后,结构恢复时间仅与剪切速率大小有关,与预剪切时间无关。 相似文献
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注射成型用塑料性能数据库研究 总被引:5,自引:0,他引:5
对注射成型常用的102种塑料的力学性能、热性能、电性能、流变性能及收缩率进行了测定,在DOS环境下,用FOXBASF建立了物性数据库。 相似文献
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聚酰胺1010加工流变性能的研究 总被引:1,自引:1,他引:0
通过转矩流变和剪切流变实验,讨论了聚酰胺1010的加工流变性能,并获得了转矩流变性能参数、不同剪切速率区的非牛顿指数,以及不同剪切速率下的粘流活化能。 相似文献
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大豆蛋白质流变性能的研究 总被引:2,自引:0,他引:2
采用毛细管流变仪和布拉本得转矩流变仪研究了大豆蛋白质的流变性能。结果表明,在通常的挤出加工条件下,大豆蛋白质是典型的假塑性流体,其非牛顿指数在0.2-0.6之间。粘度随剪切速率、含水量的增大而减小,随蛋白质含量的增大而增大。温度对粘度的影响十分复杂,在蛋白质变性前,粘度随温度的升高而减小;蛋白质变性后,粘度明显增大;在120℃左右,粘度的动态变化剧烈。该研究结果有助于指导蛋白质基生物高分子材料的挤出加工和功能改性。 相似文献
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Rheological characteristics of synthetic road binders 总被引:1,自引:0,他引:1
Most adhesives and binders, including binders for asphalt mixture production, are presently produced from petrochemicals through the refining of crude oil. The fact that crude oil reserves are a finite resource means that in the future it may become necessary to produce these materials from alternative and probably renewable sources. Suitable resources of this kind may include polysaccharides, plant oils and proteins. This paper deals with the synthesis of polymer binders from monomers that could in future be derived from renewable resources. These binders consist of polyethyl acrylate (PEA) of different molecular weight, polymethyl acrylate (PMA) and polybutyl acrylate (PBA), which were synthesised from ethyl acrylate, methyl acrylate and butyl acrylate, respectively, by atom transfer radical polymerization (ATRP). The fundamental rheological properties of these binders were determined by means of a dynamic shear rheometer (DSR) using a combination of temperature and frequency sweeps. The results indicate that PEA has rheological properties similar to that of 100/150 penetration grade bitumen, PMA similar rheological properties to that of 10/20 penetration grade bitumen, while PBA, due to its highly viscous nature and low complex modulus, cannot be used on its own as an asphalt binder. The synthetic binders were also combined with conventional penetration grade bitumen to produce a range of bitumen–synthetic polymer binder blends. These blends were batched by mass in the ratio of 1:1 or 3:1 and subjected to the same DSR rheological testing as the synthetic binders. The blends consisting of a softer bitumen (70/100 pen or 100/150 pen) with a hard synthetic binder (PMA) tended to be more compatible and therefore stable and produced rheological properties that combined the properties of the two components. The synthetic binders and particularly the extended bitumen samples (blends) produced rheological properties that showed similar characteristics to elastomeric SBS PMBs, although their precise viscoelastic properties were not identical. 相似文献
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PC/PA1010共混物的流变性能 总被引:2,自引:0,他引:2
本文用XLY-Ⅱ型毛细管流变仪研究了PC/PA1010共混物的流变特性,讨论了剪切速率、温度和配比对共混物表观粘度的影响。结果表明:当温度升高和PA1010含量增大时,共混物表观粘度明显降低,剪切速率对共混物表观粘度的影响较小。 相似文献
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