Phosphorus containing polyimides

A number of phosphorus containing polyimides were synthesized by Varma and coworkers and their properties were studied [137-141]. Polyimides have also been synthesized by the reaction of benzophenonetetra-carboxylic dianhydride (BTDA) and bis(3-aminophen-yl)methylphosphine oxide [142]. Copolyimides were... 

Oligomer 163 represents a stabilizer having PA chain with pendant phenolic moiety [31], Pendant hindered piperidine or piperazine moieties were attached to oligomeric stabilizers having polysulfonamide, polyurea (e.g. 164), or PA (e.g. 165) unis [213]. Polyhydrazide 166 was tested as HD AO and copper deactivator in PP [214]. Poly (nitrophenylene-carbazide disulfide) 167 was prepared for thermal stabilization of PVC. Phosphorus containing crosslinkable polymers having polyamide, polyimide and polyurea chains were prepared for flame and heat resistant applications [215]. 

TABLE 8.1. Conditions for MNP Synthesis by ion impiantation into Poiyvinyiidene Fiuoride (PVF2), Polyimide (PI), Polymethyl-methacryiate (PMMA), Poiymethyimethacryiate with Phosphorus-Containing Fragments (PMMA -1- PF), Polyethylene (PE), Poly(ethyleneterephthalate) (PET), Silicone Polymer (Phenylmethyl-silane Resin with Tin Diethyidicaprilate), Epoxy Polycarbonate (PC), and Polyetherimide (PEI) ... 

Beside inhibiting thermooxidative ageing, phosphorus containing additives increase radiation resistance of polyimides and poly(alkyl terephthalates) the rate of evolution of the aromatic ring radiation degradation product - CH4 reduces two-fold. 

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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