Erartsın Ozan, Zanjani Jamal Sayyed Monfared, Baran Ismet
Faculty of Engineering Technology, University of Twente, 7500 AE Enschede, The Netherlands.
Polymers (Basel). 2022 Apr 6;14(7):1493. doi: 10.3390/polym14071493.
In the co-bonding of thermoset and thermoplastic polymers, the interdiffusion of the polymers results in the formation of an interphase between them. Understanding the factors influencing the interdiffusion and the resulting interphase is crucial in order to optimize the mechanical performance of the bond. Herein, for the first time, the effect of the initiator concentration of the thermoset resin-initiator mixture on the interphase thickness of co-bonded thermoset-thermoplastic polymers is investigated. The dependence of the gelation time on the initiator concentration is determined by rheometer measurements. Differential scanning calorimetry measurements are carried out to determine the speed of cure. To co-bond the polymers, pieces of already-manufactured thermoplastic plates are embedded in a resin-initiator mixture. The interphase thickness of the co-bonded polymers is measured with an optical microscope. The results of this study show that the gelation time decreases as the initiator concentration increases. This decrease leads to a significant reduction in both interphase thickness and diffusivity. For instance, increasing the initiator/resin weight ratio from 1% to 3% reduces the gelation time by 74% and the interphase thickness by 63%.
在热固性聚合物与热塑性聚合物的共粘结过程中，聚合物的相互扩散导致它们之间形成一个中间相。了解影响相互扩散及由此产生的中间相的因素对于优化粘结的机械性能至关重要。在此，首次研究了热固性树脂 - 引发剂混合物的引发剂浓度对共粘结热固性 - 热塑性聚合物中间相厚度的影响。通过流变仪测量确定凝胶化时间对引发剂浓度的依赖性。进行差示扫描量热法测量以确定固化速度。为了共粘结聚合物，将已制造好的热塑性板片嵌入树脂 - 引发剂混合物中。用光学显微镜测量共粘结聚合物的中间相厚度。本研究结果表明，随着引发剂浓度的增加，凝胶化时间缩短。这种缩短导致中间相厚度和扩散率均显著降低。例如，将引发剂/树脂重量比从1%提高到3%可使凝胶化时间减少74%，中间相厚度减少63%。
