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首页> 外文期刊>Journal of Applied Polymer Science >Viscoelastic properties and filler dispersion in carbon black-filled and silica-filled cross-linked natural rubbers
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Viscoelastic properties and filler dispersion in carbon black-filled and silica-filled cross-linked natural rubbers

机译：炭黑和二氧化硅填充的交联天然橡胶的粘弹性和填充剂分散性

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摘要

The activation energies (ΔE_(J ′) and ΔE_(J″)) calculated from the temperature dependence of the storage compliance (J′) and the loss compliance (J″) of carbon black (CB)-filled, hydrophobic silica- and hydrophilic silica-filled cross-linked natural rubbers (NRs) were found to be less than 15 kJ mol~(-1), which corresponds to the physical range of van der Waals interaction. The results of three-dimensional-transmission electron microscopy measurements indicate that the closest distance (d_p) between the two neighboring nanofiller aggregates centers decreased sharply with increasing nanofiller loading and tended to become constant at a nanofiller loading of around 30 phr or higher. For all samples examined, there were two regions related to the elastic deformation energy, and the critical d_p value between the two regions was in the order of CB > hydrophobic silica = hydrophilic silica. Additionally, ΔEJ′ developed in the region of longer d_p than that of ΔE _(J″). On the other hand, ΔEJ ″ occurred after the formation of the filler network and was larger than ΔEJ′. ΔEJ ″ is assumed to be related to slippage of the junction and the rearrangement of the nanofiller network. Therefore, the dependence of ΔEJ′ and ΔEJ ″ on d_p suggests that the interaction layer between the nanofiller and NR has at least two energy levels.
机译：活化能（ΔE_（J'）和ΔE_（J''））由填充炭黑（CB）的疏水性二氧化硅和发现亲水性二氧化硅填充的交联天然橡胶（NRs）小于15 kJ mol〜（-1），与范德华相互作用的物理范围相对应。三维透射电子显微镜测量的结果表明，两个相邻的纳米填料聚集体中心之间的最近距离（d_p）随着纳米填料载荷的增加而急剧减小，并且在约30 phr或更高的纳米填料载荷下趋于恒定。对于所有检查的样品，存在两个与弹性变形能有关的区域，并且两个区域之间的临界d_p值的顺序为CB>疏水性二氧化硅=亲水性二氧化硅。另外，ΔEJ'在比ΔE_（J''）更长的d_p区域中发展。另一方面，ΔEJ″在填充网络形成之后发生，并且大于ΔEJ'。假定ΔEJ''与结的滑动和纳米填料网络的重排有关。因此，ΔEJ'和ΔEJ''对d_p的依赖性表明，纳米填料和NR之间的相互作用层具有至少两个能级。

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