The electrical properties of K-1 polycarbonate

To summarize, then, K-1 polycarbonate offers the following properties and advantages: Mechanical Advantages 1. Is soluble in volatile solvents. 2. Gives clear, tough films. 3. Gives hard, rigid moldings. 4. Has a glass-transition temperature of 225?C. 5. Has a tensile strength of 4500 psi. at 200?C. Electrical Advantages 6. Has an extremely stable temperature coefficient of capacitance, better than that of polystyrene or any other dielectric material. 7. Has an extremely low dissipation factor, or high Q, that approaches those of polystyrene or polyolefins. 8. Has better properties for both high and low temperature operation than do most existing dielectrics, including other polycarbonates. 9. Has very high insulation resistance at high temperatures, and there is a sensitive technique which utilizes its unique solubility and high volume resistivity for quality control. 10. Forms thin pin-hole-free films with great ease. 11. Neither under accelerated aging conditions nor by using solvents and/or high temperature, can K-1 polycarbonate be crystallized. Other polycarbonates and other polymers do crystallize or change in their level of crystallinity. Crystalline K-1 polycarbonate is unknown.