Ballesteros Alberto, Laguna-Gutiérrez Ester, Rodríguez-Pérez Miguel Ángel
Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, University of Valladolid, Paseo de Belen 7, 47011 Valladolid, Spain.
CellMat Technologies S.L., Paseo de Belen 9-A, UVA Science Park Building, 47011 Valladolid, Spain.
Polymers (Basel). 2021 Nov 6;13(21):3836. doi: 10.3390/polym13213836.
Different percentages of an elastomeric phase of styrene-ethylene-butylene-styrene (SEBS) were added to a polystyrene (PS) matrix to evaluate its nucleating effect in PS foams. It has been demonstrated that a minimum quantity of SEBS produces a high nucleation effect on the cellular materials that are produced. In particular, the results show that by adding 2% of SEBS, it is possible to reduce the cell size by 10 times while maintaining the density and open cell content of the foamed materials. The influence of this polymeric phase on the glass transition temperature (Tg) and the shear and extensional rheological properties has been studied to understand the foaming behavior. The results indicate a slight increase in the Tg and a decrease of the shear viscosity, extensional viscosity, and strain hardening coefficient as the percentage of SEBS increases. Consequently, an increase in the density and a deterioration of the cellular structure is detected for SEBS amounts higher than 3%.
将不同百分比的苯乙烯-乙烯-丁烯-苯乙烯（SEBS）弹性体相添加到聚苯乙烯（PS）基体中，以评估其在PS泡沫中的成核效果。已经证明，最低量的SEBS对所生产的多孔材料具有高成核效果。特别地，结果表明，通过添加2%的SEBS，可以在保持泡沫材料密度和开孔率的同时将泡孔尺寸减小10倍。研究了该聚合物相对玻璃化转变温度（Tg）以及剪切和拉伸流变性能的影响，以了解发泡行为。结果表明，随着SEBS百分比的增加，Tg略有升高，剪切粘度、拉伸粘度和应变硬化系数降低。因此，对于SEBS含量高于3%的情况，可以检测到密度增加且泡孔结构恶化。
