Oil-covered Substrates: A Model Study of the Evolution in the Interphase During Cure of an Epoxy Adhesive
Oil-covered Substrates: A Model Study of the Evolution in the Interphase During Cure of an Epoxy Adhesive
复制标题
油覆盖基材：环氧粘合剂固化过程中界面演化的模型研究
DOI：
10.1080/00218460008029305
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
D. Verchère
中科院分区：
文献类型：
--
作者：
M. Greiveldinger;M. Shanahan;D. Jacquet;D. Verchère
摘要汽车工业在车身装配中使用胶粘剂，在许多情况下，胶粘剂的应用不需要事先对钢板进行热处理。因此，最初在钢/粘合剂界面处的油可能潜在地改变初始和长期行为。直接研究这种钢/油/粘合剂系统的原位演变似乎非常困难，如果不是不可能的话，目前可用的技术。尽管如此，我们已经试图模拟这种情况，尽管通过用更有利于系统和深入研究接触区的材料代替钢基材，目的是在组合形成期间跟踪界面固体/油/粘合剂中的油的任何位移及其对行为的影响。我们已经使用了红外光谱，特别是，开发了一个加热ATR细胞。该技术允许在粘合剂的固化过程中（化学物质的出现或消失、交联等）和在几微米的深度上随时间变化来跟踪化学组成的演变。因此，更好地了解石油的行为和本地化内（模型）结构联合已获得并进行了讨论。我们的研究结果指出了时间的重要性，在现象的油消除和固化的界面（这个年表有很大的影响，真实的结构节点的力学性能）。油配方的影响已被考虑，因为有固化条件。最后，石油的潜在扰动的动力学和界面形成机制进行了估计和讨论。
Abstract The car industry uses adhesive bonding for bodywork assembly and, in many cases, application of adhesives is effected without prior degreasing of the steel sheet. As a consequence, oil originally at the steel/adhesive interface may potentially modify both initial and long-term behaviour. Direct study of the evolution in situ of such steel/oil/adhesive systems would seem exceedingly difficult, if not impossible, with techniques presently available. Notwithstanding, we have attempted to model the situation, albeit by replacing the steel substrate by a material more conducive to a systematic and intimate study of the zone of contact, with an aim to follow any displacement of the oil in the interphase solid/oil/adhesive during the formation of the assemblage and its influence on behaviour. We have used Infra-Red spectroscopy and, in particular, developed a heated ATR cell. The technique allows evolution of chemical composition to be followed as a function of time during the curing process of the adhesive (appearance or disappearance of chemical species, crosslinking, etc…) and over a depth of several microns. As a consequence, a better understanding of behaviour and localisation of oil within a (model) structural joint has been obtained and is discussed. Our results point out the importance of chronology in the phenomena of oil-elimination and curing within the interphase (this chronology has a great influence on mechanical properties of real structural joints). The influence of oil formulation has been considered, as have the cure conditions. Finally, the potential perturbations of oil on the kinetics and mechanisms of interphase formation have been estimated and are discussed.