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  • Polyimide is a polymeric plastic material, engineered for long term performance at very high temperatures, in excess of 250 C for prolonged periods of time.
  • Polyimide is made from two key ingredients, which may each contain traces of impurities, such as water vapor, or even traces of iron from the chemical drums containing solvents used.
  • Polyimides are a very interesting group of incredibly strong and astoundingly heat and chemical resistant polymers. Their strength and heat and chemical resistance are so great that these materials often replace glass and metals, such as steel, in many demanding industrial applications.
  • The polyimide materials are lightweight, flexible, resistant to heat and chemicals. Therefore, they are used in the electronics industry for flexible cables, as an insulating film on magnet wire and for medical tubing.
  • Polyimides are a class of polymers notable for chemical, wear, radiation, and temperature resistance, characteristics that have led to applications as diverse as aerospace engine housings and electronics packaging.
  • The use of polyimides in the manufacture of hybrid circuits is increasing. These organic compounds are suited to thick and thin film applications because of their ability to be patterened, and desirable mechanical, chemical , thermal and electrical properties.
  • Polyimides are a class of thermally stable polymers that are often based on stiff aromatic backbones. The chemistry of polyimides is in itself a vast area with a large variety of monomers available and several methodologies available for synthesis.
  • The most widely practiced procedure in polyimide synthesis is the two-step poly(amic acid) process. It involves reacting a dianhydride and a diamine at ambient conditions in a dipolar aprotic solvent such as N,N-dimethylacetamide (DMAc) or Nmethylpyrrolidinone (NMP) to yield the corresponding poly(amic acid), which is then cyclized into the final polyimide.
  • In Polyimide polymers, the double bonded Oxygen group is an appropriate site for local Water adsorption. To model this kinetically, it is assumed that at least one Water molecule is adsorbed on the specific site and - after some time - is desorbed.
  • Polyimides have been of great interest in engineering and microelectronics for a number of applications owing to their unique property combinations.
  • Polyimide can also withstand much higher temperatures (greater than 300OC) than most polymers. This property allows polyimide to accept vacuum depositions of metals better than Lexan.
  • Polyimide is becoming widely used for many ultrathin film applications because of its superior strength.
  • Major producers of polyimide film, Kaneka High Tech Materials(KHM) (Manufacturing facilities in Texas and Japan) and Dupont have reacted to this situation and have announced plans to significantly increase capacity sometime during the first half of 2002.
  • Consumption of polyimide and other imide polymer resins in Asian countries other than Japan, including China, India, the Republic of Korea, Malaysia and Taiwan, has been growing rapidly in recent years despite the global economic recession

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