Polyimide curing

Figure 7. Comparison of various models for the F650 polyimide cure at 3° F/min.

Figure 15.21. Final curing temperature vs. in-plane birefringence of six kinds of polyimides cured under a constant load.

The more recent synthetic route preimidizes short molecular segments, similar in nature to those of condensation polyimides. Cure is by polymerization... 

TABLE 3.52 Acetylene-Terminated Polyimide Cured Properties... 

TABLE 3.56 Paracyclc hane-Polyimide Cured L ninates ... 

From Table 1, below, no signs of thermal decomposition were observed below 400 °C for nitrile and sulfonyl substituted di-and triaryl oxazoles. Nitro compounds, in contrast, exhibited marked thermal decomposition exotherms with decomposition onset temperatures of 360-365 °C, conditions only marginally compatible with polyimide curing conditions. Nitro aromatics are also oxidants which may lead to long-term stability problems. As a result of these experiments nitrile and sulfonyl substituted diaryl oxazoles were selected for polymer doping studies. 

Figure 26 Variation of the lap shear strength as a function of temperature for conductive adhesives (a) IP 680 silver-filled polyimide cured at 300°C (b) IP 670 silver-filled epoxy...

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