[논문]Anomalous but useful behavior of epoxy adhesive system

Ansong, Omari

doi:10.1016/j.ijadhadh.2011.06.006

Anomalous but useful behavior of epoxy adhesive system

International journal of adhesion and adhesives, v.31 no.7, 2011년, pp.620 - 628

Ansong, Omari (Raytheon Missile Systems, P.O. Box 11337, Tucson, AZ 85734-1337, USA)

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AbstractFreeze storage of adhesives has been an industry-wide practice for a long time. However, when the technique was applied to an epoxy adhesive, anomalous, but very useful results were obtained. Among other observations, the study showed that freeze storage changes the final properties of the epoxy. The epoxy was applied as an adhesive in the sealing of a component. Among adhesive candidates that were evaluated, the epoxy EA9396 was preferentially selected because it is amenable to room temperature cure and consequently it exhibits less stress and fracture upon cure. The formulation was frozen at −43°C for different periods of time. A cure schedule consisting of 16h at room temperature followed by two hours at 65°C imparted shore D hardness of 80, shear strength of about 1800psi and an extent of cure of 82% to the adhesive regardless of the length of the freezing time. Rheometry analysis of the thawed frozen formulation showed an anomalous trend whereby the pot life increased immensely in direct proportion to the duration of the freezing time. In this study pot life implies the working life after the frozen formulation is thawed. A pot life of 85min was observed for samples cold-stored for three weeks. This method would offer advantages in applications requiring long pot and cold storage lives. This paper provides an insight into this phenomenon. Highlights► An epoxy adhesive system was studied. ► The adhesive showed new chemistry and anomalous cure profile. ► The pot life increased in direct proportion with the duration of freeze storage. ► The anomalous behavior greatly benefits applications requiring long pot lives. ► Molecular dynamics and conformational energetics would explain the anomaly.

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참고문헌 (19)

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Anomalous but useful behavior of epoxy adhesive system

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