环氧-胺体系中固化诱导的填料聚集
Curing-induced filler aggregation in epoxy-amine systems
AI总结：
研究发现固化过程通过产生有效吸引力诱导填料聚集，其空间范围与粒子尺寸相关，为预测聚合物复合材料最终分散状态提供几何准则。
摘要：
假设：聚合物复合材料的宏观性能由填充物粒子在交联基质中的分散和聚集状态决定。尽管固化将液态前驱体转化为固态网络，其对填料聚集的影响仍不够清楚。我们假设固化会诱导填充物粒子之间有效的吸引力，即使在非布朗运动系统中也会导致聚集。实验：荧光聚苯乙烯珠被均匀分散在双酚F环氧树脂中。通过添加三甲基己六甲基二胺启动固化，使用共聚焦激光荧光显微镜在固化前和完成后定量研究三维粒子配置的演变。发现：在没有传统吸引力的情况下，固化过程中聚集程度增强。聚集增量不能仅用填充物体积分数描述，而是由平均粒子间间隙H决定。数据坍缩到与减少间隙参数线性缩放，识别出一个几何控制参数用于固化诱导聚集。这种缩放表明固化动态产生一种有效相互作用，其空间范围与粒子尺寸成比例，与之前预测的刚性渗流诱导吸引力一致。这些发现建立了预测固化聚合物复合材料最终分散状态的几何标准。
英文摘要：
Hypothesis: The macroscopic properties of polymer composites are governed by the dispersion and aggregation states of filler particles within a crosslinking matrix. Although curing transforms a liquid precursor into a solid network, its influence on filler aggregation remains insufficiently understood. We hypothesize that curing induces effective attractive interactions between filler particles, leading to aggregation even in non-Brownian systems. Experiment: Fluorescent polystyrene beads were homogeneously dispersed in a bisphenol F epoxy resin. Curing was initiated by adding trimethylhexamethylenediamine, and the evolution of the three-dimensional particle configurations was quantitatively examined using confocal laser fluorescence microscopy before and after completion of curing. Findings: Aggregation was enhanced during curing despite the absence of conventional attractive forces. The aggregation increment cannot be described solely by filler volume fraction but is governed by the mean interparticle gap $H$. Data collapse onto a linear scaling with the reduced gap parameter, identifying a geometric control parameter for curing-induced aggregation. This scaling demonstrates that curing dynamically generates an effective interaction whose spatial range scales with particle size, consistent with previously predicted rigidity-percolation-induced attractions. These findings establish a geometric criterion for predicting final dispersion states in curing polymer composites.
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