Department of Chemical Engineering, School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, 85287, USA.
Macromol Rapid Commun. 2018 Jul;39(14):e1800091. doi: 10.1002/marc.201800091. Epub 2018 Apr 20.
An evolving understanding of elastomeric polymer nanocomposites continues to expand commercial, defense, and industrial products and applications. This work explores the thermomechanical properties of elastomeric nanocomposites prepared from bisphenol A diglycidyl ether and three amine-terminated poly(propylene oxides) (Jeffamines). The Jeffamines investigated include difunctional crosslinkers with molecular weights of 2000 and 4000 g mol and a trifunctional crosslinker with a molecular weight of 3000 g mol . Additionally, carbon nanotubes (CNTs) are added, up to 1.25 wt%, to each thermoset. The findings indicate that the T and storage modulus of the polymer nanocomposites can be controlled independently within narrow concentration windows, and that effects observed following CNT incorporation are dependent on the crosslinker molecular weight. Finally, the impact of crosslinker length and architecture as well as CNT addition on the molecular weight between crosslink points in the glassy and rubbery states are discussed.
对弹性体聚合物纳米复合材料的不断深入的理解，持续拓展了商业、国防和工业产品及应用领域。这项工作探索了双酚 A 二缩水甘油醚和三种端胺基聚（氧化丙烯）（Jeffamines）制备的弹性体纳米复合材料的热机械性能。所研究的 Jeffamines 包括分子量为 2000 和 4000 g/mol 的双官能交联剂和分子量为 3000 g/mol 的三官能交联剂。此外，还向每种热固性材料中添加了高达 1.25wt%的碳纳米管（CNTs）。研究结果表明，聚合物纳米复合材料的 Tg 和储能模量可以在狭窄的浓度窗口内独立控制，并且在加入 CNT 后观察到的效果取决于交联剂的分子量。最后，讨论了交联剂长度和结构以及 CNT 添加对玻璃态和橡胶态交联点间分子量的影响。
