Imide-containing polymers, resistance

The utility of polyaniline in corrosion resistant coatings has been noted [McAndrew et al., 1996]. The addition of polyaniline to acid containing polymers e.g., polyamic acid precursor of poly-imides, styrene-acrylic acid copolymers) allowed for polymeric doping and intermediate corrosion protection of the blends compared to the constituents. Epoxy addition and diisocyante terminated... 

New heat-resistant polymers containing -iiitrophenyl-substituted quinoxaline units and imide rings as well as flexible amide groups have been synthesi2ed by polycondensation reaction of a dianainoquinoxaline derivative with diacid dichlorides (80). These polymers are easily soluble in polar aprotic solvents with inherent viscosities in the range of 0.3—0.9 dL/g in NMP at 20°C. AH polymers begin to decompose above 370°C. 

As part of an effort to develop high-performance, high-temperature-resistant polymers for microelectronics applications, we also recently described a series of both partially fluorinated and nonfluorinated poly(aryl ether ketone)s containing amide, amide-imide, cyano oxadizole, or pyridazine groups and characterized their thermal and electrical properties.11... 

The present state of the synthesis of poly(naphthalenecarboximides) and poly(perylenecarboximides) containing six-memhered imide rings in the hackhones is reviewed. Recent advances in synthetic approaches provide access to polymers exhibiting high thermal stability and chemical resistance, optical conductivity, and electrographic properties. The resulting polymers are high molecular-mass, soluble products that are easily processed by traditional methods. 

It is well known that polymers with condensed imide rings exhibit high thermal stability. Properties of the imide ring containing ACEC LXII (Scheme 78), cured with amines and with an acid anhydride, are given in Table 20. Acid anhydride cured epoxyimides reach the heat resistance of 190 °C, temperature of the start of decomposition above 265 °C and flexural strength above 70 MPa. 

Polyether imide n. A polymer containing both ester and imide groups in the polymer chain. They are usually synthesized by polycondensation between a dianhydride containing aromatic ester links and a diamine. Their main use is as high temperature resistant wire See image). 

Polyimides are a group of extremely strong polymers that are also highly heat and chemical resistant. These polymers contain the imide functionality. We have seen Uiat the amide functionality [—C(0)NH—] is present in synthetic polyamides like nylon-6,6 as well as in natural polyamides like proteins. The imide functional group is created when nitrogen is at-... 

In an attempt to improve thermal stability even further a series of poly-anhydride-imides have been prepared containing phosphorus. While such polymers had good hydrolytic stability, they had little heat resistance and poor flame retardency. Several papers have appeared on the synthesis of polyesteri-mides. Photosensitive polyimides have also been prepared. " ... 

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