Instabilities driven by frontal polymerization in thermosetting polymers and composites
Instabilities driven by frontal polymerization in thermosetting polymers and composites
复制标题
DOI：
10.1016/j.compositesb.2020.108306
复制
发表时间：
2020-10-15
影响因子：
13.1
通讯作者：
Geubelle, P. H.
中科院分区：
文献类型：
--
作者：
Goli, E.;Peterson, S. R.;Geubelle, P. H.
前沿聚合（FP）最近被证明是一种更快，更节能的方法来制造纤维增强热固性聚合物基复合材料。FP使用来自单体和引发剂的溶液的放热反应的热量来产生自蔓延聚合前沿。在大多数情况下，聚合前沿以稳定的方式传播。然而，在某些条件下，前部经历不稳定性，这确实影响所制造的复合材料部件的质量。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FP驱动的不稳定性在双环戊二烯（DCPD）和碳纤维DCPD基复合材料。借助于一维瞬态模拟，我们研究了初始温度和碳纤维体积分数对热不稳定性的振幅和波长的影响。我们还提取的范围内的加工条件的不稳定性预测出现。本工作的最后一部分研究了在纯树脂和复合材料情况下对流热损失对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 self-propagating 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.