Xiang Liu, Mei Fang, Yuezhan Feng, Ming Huang, Chuntai Liu, Changyu Shen
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引用次数: 0
摘要
利用双酚 A 的二缩水甘油醚与戊二酸酐交联形成传统的 "共价自适应网络",利用聚醚砜(PES)在自适应网络上的盘绕和聚集显著提高树脂的未固化粘度,从而改善环氧树脂的加工性能,但不可避免地会影响固化反应和动态酯交换反应。本研究探讨了 PES 在固化动力学和应力松弛行为中的关键作用。研究结果表明,虽然 PES 并不直接参与聚酯基环氧树脂玻璃体的交联反应,但它在固化过程中对应力松弛行为起着至关重要的作用。此外,等温固化研究表明,PES 的加入可大大提高反应速率峰值,从转化率 α = 0.6 提高到 α = 0.2,这意味着固化机理从化学控制转变为扩散控制。动态特性分析表明,PES 的加入大大加快了应力松弛,尤其是在较低温度下,从而导致较低的粘流活化能 Eτ 和对温度相对不敏感的应力松弛行为。在玻璃树脂中加入聚醚砜可大大提高交联密度(2.31 × 10⁴ mol m- 3),从而提高玻璃化转变温度(82.68 °C)、拉伸强度(68.66 兆帕)和断裂韧性(6.25%)。此外,改性后的三聚氰酸酯树脂还具有令人满意的形状记忆性能和再加工能力。
Investigation on Polyether Sulfone Toughening Epoxy Vitrimer: Curing and Dynamic Properties.
Diglycidyl ether of bisphenol A crosslinking with glutaric anhydride is used to form the conventional "covalent adaptive network", polyether sulfone (PES) by coiling and aggregating on the adaptive network is used to significantly increase the uncured resin viscosity for improving the processability of epoxy resin, but inevitably affecting the curing reaction and dynamic transesterification reaction. This study investigates the crucial roles of PES in curing dynamics and stress relaxation behavior. The results indicate that although PES does not directly participate in the crosslinking reaction of polyester-based epoxy vitrimers. Moreover, the isothermal curing studies reveal that the addition of PES can greatly bring forward the reaction rate peak from conversion α = 0.6 to α = 0.2, meaning that the curing mechanism transfers from chemical control to diffusion control. Dynamic property analysis shows that the addition of PES significantly accelerates stress relaxation, especially at lower temperatures, leading to low viscous flow activation energy Eτ and relatively insensitive stress relaxation behavior to temperature. Introducing PES into vitrimer resin greatly improves crosslinking density (2.31 × 10⁴ mol m-3), enhancing glass transition temperature (82.68 °C), tensile strength (68.66 MPa), and fracture toughness (6.25%). Additionally, the modified vitrimer resin exhibits satisfying shape memory performance and reprocessing capability.
期刊介绍:
Macromolecular Rapid Communications publishes original research in polymer science, ranging from chemistry and physics of polymers to polymers in materials science and life sciences.