Abstract Porous polyurethane (PUR) and polystyrene (PS) composites can be obtained by co-expansion process. This method involves simultaneous foaming of PUR and expanding PS beads (PSB), what is possible by utilizing exothermic heat of PUR formation. In this study, PUR-PS porous composites were obtained by using different types of commercial PS beads having various initial sizes. Co-expansion processes were characterized using Foamat device. The following parameters of co-expanded materials were measured: the rise profile, the reaction temperature, the rise pressure and the dielectric polarization. The results analyzes allowed to divide the co-expansion process into 3 stages: PUR foaming below the PS softening temperature, expansion of PUR and PS in the same time, PS expansion after PUR gelling. The addition of PS filler causes: a reduction of the core temperature, increasing the pressure, slowing the PUR reaction formation and the slowdown in the rise velocity of reaction mixture. It also causes the elongation of start, gelling, rise and curing times.

中文翻译：

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共膨胀工艺生产的多孔聚氨酯-聚苯乙烯复合材料

摘要 通过共膨胀工艺可以得到多孔聚氨酯（PUR）和聚苯乙烯（PS）复合材料。该方法涉及同时发泡 PUR 和膨胀 PS 珠粒 (PSB)，这可以通过利用 PUR 形成的放热来实现。在这项研究中，PUR-PS 多孔复合材料是通过使用不同类型的具有不同初始尺寸的商业 PS 珠粒获得的。共膨胀过程使用 Foamat 装置进行表征。测量了共膨胀材料的以下参数：上升曲线、反应温度、上升压力和介电极化。结果分析允许将共膨胀过程分为 3 个阶段：低于 PS 软化温度的 PUR 发泡、PUR 和 PS 同时膨胀、PUR 胶凝后的 PS 膨胀。PS填料的加入导致：降低核心温度，增加压力，减缓 PUR 反应的形成和反应混合物上升速度的减慢。它还导致起始、胶凝、上升和固化时间的延长。