论文标题
由热固性聚合物和复合材料中额叶聚合驱动的不稳定性
Instabilities driven by frontal polymerization in thermosetting polymers and composites
论文作者
论文摘要
额叶聚合（FP）最近被证明是一种制造纤维增强热敏聚合物 - 聚合物 - 矩阵复合材料的更快，更节能的方法。 FP使用单体溶液和引发剂溶液的放热反应来产生自发聚合的前端。在大多数情况下，聚合的前端以稳定的方式传播。但是，在某些条件下，前沿体验不稳定性，确实会影响制成的复合部分的质量。在这项工作中，我们使用耦合的热化学模型和自适应非线性有限元求解器来模拟双环戊二烯（DCPD）和碳纤维DCPD-MATRIX复合材料中的FP驱动的不稳定性。借助1-D瞬态模拟，我们研究了初始温度和碳纤维体积分数如何影响热不稳定性的幅度和波长。我们还提取了预计会出现不稳定性的处理条件的范围。这项工作的最后一部分调查了对流热损失对整洁树脂和复合材料病例中FP驱动的不稳定性的影响。
Frontal Polymerization (FP) was recently demonstrated as a faster, more energy-efficient way to manufacture fiber-reinforced thermosetting-polymer-matrix composites. FP uses heat from the exothermic reaction of the solution of monomer and initiator to generate a selfpropagating polymerization front. In most cases, the polymerization front propagates in a steady fashion. However, under some conditions, the front experiences instabilities, which do affect the quality of the manufactured composite part. In this work, we use a coupled thermo-chemical model and an adaptive nonlinear finite element solver to simulate FP-driven instabilities in dicyclopentadiene (DCPD) and in carbon-fiber DCPD-matrix composites. With the aid of 1-D transient simulations, we investigate how the initial temperature and the carbon fiber volume fraction affect the amplitude and wavelength of the thermal instabilities. We also extract the range of processing conditions for which the instabilities are predicted to appear. The last part of this work investigates the effect of convective heat loss on the FP-driven instabilities in both neat resin and composite cases.
