[Retracted] Application of Nanoflexible Photoelectric Devices in Welding Tooling Equipment Systems

Table 4

Physicochemical parameters of polyimide.

Project	Homobenzene polyimide	Polybismaleimide	Polyimide
Specific heat capacity	1.12	1.22	1.13
Thermal conductivity	1.1	2.1	1.1
Coefficient of linear expansion	6	2.5	5.7
Molding shrinkage	0.11	>0.15	0.2
Oxygen index	42	45	45
Flow temperature	>360	>250	>335
Thermal deformation temperature	365	310	220
Dielectric constant	3.2∼3.5	4.1∼4.7	3.1∼3.5
Volume resistivity	10^16	10^15	10^15