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首页> 外文期刊>Journal of Applied Polymer Science >Effects of quasi-nanogel particles on the rheological and mechanical properties of natural rubber: A new insight
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Effects of quasi-nanogel particles on the rheological and mechanical properties of natural rubber: A new insight

机译：准纳米凝胶颗粒对天然橡胶流变和力学性能的影响：新的见解

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The influence of sulfur-crosslinked, quasinanosized gels on the rheological and mechanical properties of raw natural rubber (NR) was investigated. Latex gels with different crosslink densities were prepared through the variation of the sulfur-to-accelerator ratio. These gels were characterized by dynamic light scattering, solvent swelling, and mechanical properties. The gels were mixed with raw NR latex at concentrations of 2, 4, 8, and 1.6 phr, and their effect on the rheological properties of NR was studied by Monsanto processability tester. The presence of gel in raw NR reduced the apparent shear viscosity and die swell considerably. Initially, the viscosity decreased up to a 8 phr gel loading and then increased with an increase in the gel loading. However, the change in the viscosity was related to the crosslink density of the gels. A new empirical equation relating the viscosity, volume fraction of the gels, and crosslink density was proposed. The die swell of gel-filled raw NR was at least 10% lower than that of unfilled raw NR and decreased with an increase in the gel loading. The effect of the gels on the die swell properties was explained through the calculation of the principal normal stress difference of gel-filled NR systems. Scanning electron photomicrographs of the extrudates revealed much better surface smoothness for the gel-filled virgin rubber systems than for the unfilled rubber. The addition of the gels to raw NR increased the modulus and tensile strength, whereas the elongation at break decreased. The effect of the gels on the dynamic mechanical properties of NR was also investigated. (c) 2007 Wiley Periodicals, Inc.
机译：研究了硫交联的准纳米级凝胶对天然橡胶原料（NR）流变和力学性能的影响。通过改变硫对促进剂的比例，可以制备出具有不同交联密度的胶乳。这些凝胶的特征在于动态光散射，溶剂溶胀和机械性能。将凝胶与浓度为2、4、8和1.6 phr的天然NR胶乳混合，并通过孟山都可加工性测试仪研究了它们对NR流变性能的影响。原料NR中存在凝胶，降低了表观剪切粘度，模头膨胀显着。最初，粘度下降到8 phr凝胶载荷，然后随凝胶载荷的增加而增加。但是，粘度的变化与凝胶的交联密度有关。提出了一个新的经验公式，涉及粘度，凝胶的体积分数和交联密度。凝胶填充的原始NR的模头膨胀比未填充的原始NR的模头膨胀至少低10％，并且随着凝胶载量的增加而降低。通过计算凝胶填充的NR系统的主要法向应力差，可以解释凝胶对模头溶胀性能的影响。挤出物的扫描电子显微照片显示，凝胶填充的原始橡胶体系的表面光滑度比未填充的橡胶更好。将凝胶添加到未加工的NR中可增加模量和拉伸强度，而断裂伸长率则降低。还研究了凝胶对NR动态力学性能的影响。 （c）2007年Wiley Periodicals，Inc.

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