87- and 88-series Halthanes

Figure 6. The low-temperature storage moduli of 87- and 88-series Halthanes show a smaller relaxation strength than 73-series Halthanes because of the aromatic...

Figure 7. Differential scanning calorimeter traces of 87- and 88-series Halthanes show the soft segment glass transition and a curing endotherm at about —70° and 100°C, respectively.

This section is subdivided into two parts based on the two types of LLNL Halthane adhesives. The basic distinction between these adhesives is the modulus of the rubbery plateau. Halthane 73-series adhesives are tough, rubbery polyurethanes with a modulus of about 10 Pa at room temperature. On the other hand, Halthanes 87-1, 87-2, and 88-2 are stiff, almost glassy adhesives with a modulus of about 10 Pa at room temperature. 

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