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Thermal transport and chemical effects of fillers on free‐radical frontal polymerization
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-07-19 , DOI: 10.1002/pol.20200323 Daniel P. Gary 1 , Samuel Bynum 1 , Baylen D. Thompson 1 , Brecklyn R. Groce 1 , Anthony Sagona 1 , Imogen M. Hoffman 1 , Catherine Morejon‐Garcia 1 , Corey Weber 1 , John A. Pojman 1
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-07-19 , DOI: 10.1002/pol.20200323 Daniel P. Gary 1 , Samuel Bynum 1 , Baylen D. Thompson 1 , Brecklyn R. Groce 1 , Anthony Sagona 1 , Imogen M. Hoffman 1 , Catherine Morejon‐Garcia 1 , Corey Weber 1 , John A. Pojman 1
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Frontal polymerization (FP) is a process in which a front propagates in a localized reaction zone, converting monomer into polymer through the coupling of thermal diffusion with the Arrhenius kinetics of an exothermic reaction. Fillers are added to control the rheological properties of the formulation and to enhance the mechanical properties of the product. However, the thermal and chemical effects of these fillers on the front propagation have not been thoroughly explored. Herein we report the thermal and chemical effects of fillers on free‐radical frontal polymerization. It was found that fillers with high thermal diffusivities, such as milled carbon fiber and boron nitride increased the front velocity. Despite their high thermal diffusivities, fillers such as aluminum and alumina decreased the front velocity. This is likely due to the radical‐scavenging ability of aluminum oxide, which was explored with clay minerals. It was found that the presence of water within clay fillers can also decrease the front velocity. To probe the chemical effects, acid‐activated clay minerals were utilized. The results demonstrate that some fillers can increase front velocity through their high thermal diffusivities while others decrease it by acting as radical scavengers.
中文翻译：
填料对自由基额叶聚合的热传递和化学作用
前沿聚合（FP）是一种过程，其中前沿在局部反应区中扩散，通过热扩散与放热反应的阿伦尼乌斯动力学的耦合将单体转化为聚合物。添加填料以控制制剂的流变性质并增强产品的机械性质。但是，尚未充分研究这些填料对前部传播的热和化学作用。在这里，我们报告了填料对自由基额叶聚合反应的热和化学作用。已经发现，具有高热扩散率的填料，例如磨碎的碳纤维和氮化硼，可以提高前沿速度。尽管它们具有很高的热扩散率，但诸如铝和氧化铝之类的填料却降低了前端速度。这可能是由于氧化铝的自由基清除能力所致，这是用粘土矿物开发出来的。已经发现，粘土填料中水的存在还可以降低前沿速度。为了探究化学作用，使用了酸活化粘土矿物。结果表明，某些填料可以通过其高的热扩散率来提高前沿速度，而另一些则可以通过充当自由基清除剂来降低前沿速度。
更新日期：2020-07-19
中文翻译：
填料对自由基额叶聚合的热传递和化学作用
前沿聚合（FP）是一种过程，其中前沿在局部反应区中扩散，通过热扩散与放热反应的阿伦尼乌斯动力学的耦合将单体转化为聚合物。添加填料以控制制剂的流变性质并增强产品的机械性质。但是，尚未充分研究这些填料对前部传播的热和化学作用。在这里，我们报告了填料对自由基额叶聚合反应的热和化学作用。已经发现，具有高热扩散率的填料，例如磨碎的碳纤维和氮化硼，可以提高前沿速度。尽管它们具有很高的热扩散率，但诸如铝和氧化铝之类的填料却降低了前端速度。这可能是由于氧化铝的自由基清除能力所致，这是用粘土矿物开发出来的。已经发现，粘土填料中水的存在还可以降低前沿速度。为了探究化学作用，使用了酸活化粘土矿物。结果表明，某些填料可以通过其高的热扩散率来提高前沿速度，而另一些则可以通过充当自由基清除剂来降低前沿速度。
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