Page 183 - Handbook of Plastics Technologies

THERMOSETS

THERMOSETS 3.53

TABLE 3.52 Acetylene-Terminated Polyimide Cured
Properties
T g 386°C
Laminate flexural modulus, 23°C 4,600,000 psi
316°C 3,000,000 psi
Laminate flexural strength, 23°C 69,000 psi
316°C 45,000 psi
Shear strength, room temperature 12,000 psi
Aged 500 hr/200°C 8,700 psi
Aged 500 hr/288°C 7,400 psi
Aged 500 hr/316°C 6,000 psi

Weight loss, 1000 hr/351°C 4%
Dielectric constant, 10 MHz 5.38
12 GHz 3.12
Loss tangent, 10 MHz 0.0006
12 GHz 0.0048

FIGURE 3.47 Cross-linking acetylene-terminated polyimides.

pressors, and automotive transmissions; seals and insulators in nuclear applications; elec-
tric motors, wire and cable, and magnet wire; printed circuit boards; and high-temperature
adhesives.

3.1.7 Miscellaneous Cross-Linking Reactions
Beyond the major thermoset plastics described above, research, development, and special-
ized production have explored a number of other cross-linking reactions for producing

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