Poly high-temperature aromatic polymer

Aromatic polyimides have achieved considerable success as high temperature-resistant polymers. Since the desired high molecular weight polyimides are not readily processable, they are generated in situ by the thermal ring closure of the processable precursor poly(amic-acids) ( 2). The use of low molecular weight prepolymers, i.e. poly(amic-acids), as laminating resins is limited by their conversion to an intractable state before complete elimination of volatile by-products. 

Agrawal S, Narula AK. Synthesis and characterization of phosphorus containing aromatic poly(amide-imide)s copolymers for high temperature applications. Polym Bull 2013 70(12) 3241-60. 

The synthesis of poly(arylene ether oxadiazoles) firom bis(hydroxyphenyl oxadiazoles) and commercially available activated aromatic dihalides has recently been reported (5). As part of an effort to develop high performance, high temperature resistant polymers for microelectronic applications, we have prepared a series of poly(arylene ether-l,3,4-oxadiazoles) and diaracterized their thermal, mechanical, and electrical properties. The po arylene ether-l A oxadiazoles) reported herein were prepared by the reaction of a bisphenol with the bis(4-fluorophenyl)-l,3,4-oxadiazoles, 1 and 3, using potassium carbonate in N,N-dimethylacetamide. 

Most polyesters (qv) are based on phthalates. They are referred to as aromatic-aHphatic or aromatic according to the copolymerized diol. Thus poly(ethylene terephthalate) [25038-59-9] (PET), poly(butyelene terephthalate) [24968-12-5] (PBT), and related polymers are termed aromatic-aHphatic polyester resins, whereas poly(bisphenol A phthalate)s are called aromatic polyester resins or polyarylates PET and PBT resins are the largest volume aromatic-aHphatic products. Other aromatic-aHphatic polyesters (65) include Eastman Kodak s Kodar resin, which is a PET resin modified with isophthalate and dimethylolcyclohexane. Polyarylate resins are lower volume specialty resins for high temperature (HDT) end uses (see HeaT-RESISTANT POLYAffiRS). 

Over the past 20 years a considerable chemical research effort was devoted to developing new high temperature polymers. It is interesting to note that some of these materials are now finding new applications and solutions to old problems of processing through blending. A commercial series of products trade-named Tribolon XT has been announced which are based on an aromatic polymide (Upjohn s 2080) with Phillips poly(phenylene sulfide), trade-named Ryton. A recent publication (88) describes some of the unique characteristics of this new family of materials. 

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