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首页> 外文会议>International Conference on Blowing Agents and Foaming Processes; 20040510-20040511; Hamburg(DE) >ASSESSMENT OF THE FOAMABILITY OF POLYMERS ON THE BASIS OF THEIR BIAXIAL STRESS/STRAIN BEHAVIOUR
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ASSESSMENT OF THE FOAMABILITY OF POLYMERS ON THE BASIS OF THEIR BIAXIAL STRESS/STRAIN BEHAVIOUR

机译：基于其双轴应力/应变行为的聚合物可发泡性评估

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摘要

Standard material data like MFI or shear viscosity, are not sufficient for predicting a polymer's foamability. Based on the approach that the melt is biaxially stretched during cell expansion, it should be possible to use the biaxial stress-strain behaviour as a criterion for assessing the foaming characteristics. With the Membrane Inflation Rheometer (MIR) developed at the IKV, biaxial stress-strain curves for various polymers were measured and described with the aid of simple characteristic data. For various grades of PP it is shown that polymers with good foaming characteristics have a fundamentally different stress-strain behaviour than types that are normally not used for foam extrusion. Biaxial stress-strain curves were plotted for a PP grade with a linear chain structure, a PP grade with a branched chain structure and combinations of the two. Branched PP types and blends consisting predominantly of such grades display a strain hardening that is vital for good foam formation and stabilisation. The polymers examined were subsequently processed on an extrusion line for foamed sheets. The foam structure of the sheets was examined and correlated with the measured stress-strain curves.
机译：MFI或剪切粘度等标准材料数据不足以预测聚合物的发泡性。基于在孔膨胀期间熔体被双轴拉伸的方法，应该有可能使用双轴应力-应变行为作为评估发泡特性的标准。借助在IKV开发的膜充气流变仪（MIR），可以通过简单的特征数据来测量和描述各种聚合物的双轴应力-应变曲线。对于各种等级的PP，表明具有良好发泡特性的聚合物与通常不用于泡沫挤出的类型具有根本不同的应力-应变行为。绘制了具有线性链结构的PP级，具有支链结构的PP级以及两者的组合的双轴应力-应变曲线。主要由此类等级组成的支链PP类型和混合物显示出应变硬化，这对于良好的泡沫形成和稳定至关重要。随后将检查的聚合物在挤出生产线上加工成泡沫片。检查板的泡沫结构，并将其与测得的应力-应变曲线相关联。

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