2017/11/15 17:12
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产品配置单:
动态热机械分析仪
型号: DMA25/50
产地: 法国
品牌: 麦特韦伯
¥70万 - 100万
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仪尊科技:温度对涤纶纤维力学性能的影响
this study investigates the mechanical behaviour of polyester fibres over a range of temperatures by the use of a number of experimental techniques including tensile, creep and fatigue tests.the influences of temperature on the different mechanical properties is investigated with particular emphasise on the loss of rigidity and reduction of creep and fatigue lifetimes.A precise description of the stress /strain curves of the fibres highlights the effects with respect to the glass transition temperature. The fatigue failure process is precisely detailed and changes, at high temperatures, to the classical fracture morphology observations made of single fibres and yarns provides valuable information about the interpretation of result obtained with single fibre test to fibre assemblies
石油/化工
2017/11/15
仪尊科技:向列式弹性体交联分布对动态力学性能的影响
We study three monodomain single-crystal nematic elastomer materials, all side-chain siloxane polymers with the same mesogenic groups but with different types of cross linking: short flexible siloxane linkage affine to the network backbone, short flexible aliphatic cross links miscible with mesogenic side-chain groups, and long segments of main-chain nematic polymer. The dynamic mechanical response of these three systems shows a characteristically universal decrease of storage modulus and a corresponding increase of loss factor. This effect of dynamic soft elasticity is strongly anisotropic, depending on the nematic director orientation. We examine the important role of the average backbone chain anisotropy , which is affected by the cross-linking geometry and contributes to the magnitude and frequency dependence of the dynamic anomaly, and discuss possible applications in mechanical damping and polarized acoustic technology.
其他
2017/11/15
仪尊科技:纤维流变性能研究-New Fiber Technology (III) – Spinning of the Conductive Fiber (2/2)
In this work the unsteady-state contact angle at the interface between polymer melt and carbon black (CB) was measured. The transition of contact angle from an unsteady to a steady state can be divided into three stages, the unsteady thermo-stage, the wetting stage, and the reach of equilibrium contact angle. Subsequently, three critical indices, the unsteady heat-transfer period t0, the retardation time τ, and the contact angle at equilibrium state A∞ are defined herein. The decrease in contact angle against time can be simulated by an exponential decay that involves these three critical indices. Molten polypropylene (PP) and polystyrene (PS) have the smallest equilibrium angle A∞, followed by polybutylene terephthalate (PBT), and polymethyl methacrylate (PMMA) has the greatest angle. Interestingly, this order is strongly related to the solubility parameter of each polymer. The CB coated with sulfonated polyester slightly changes the equilibrium angle A∞, but drastically reduces the retardation time τ for PP and PBT. This finding indicates that the CB, whose surface is modified by sulfonated polyester, can effectively reduce the compounding time of PP and polyester. Experimental results also reveal that reduce compact density slightly increases A∞ but barely affects τ. Furthermore, modifying PS with polybutadiene particles yields a high contact angle A∞ and a low τ value.
石油/化工
2017/09/21
仪尊科技:粉末流变仪应用爽肤水的流动特性研究
ABSTRACT: This is a study of the flow properties of a range of magnetic toners produced from a common base in relation to three physical variables – the milling method, the type and amount of flow additive and to a limited extent, particle size. Two methods of milling were used for sample preparation – air jet milling and mechanical milling. The flow additives were either HMDS or PDMS silicas. The study used the FT3 powder Rheometer (Freeman Technology) to determine the rheology of powder samples in terms of the energy required to cause a powder to flow. The dependence upon environmental factors commonly imposed on powders such as flow rate, the level of aeration and the amount of consolidation are determined for each of the materials. The propensity to retain air is also investigated and quantified. The results clearly indicate the complex nature of toners and how their flow properties are affected by a large number of variables, of which one of the most significant is the effect of aeration and de-aeration representing the transition from fluidisation to consolidation.
化妆品
2017/09/14