Polyesterimide polymers from

Properties.—A polyimide from succcinic acid has been fractionated and Mark-Houwink equation parameters determined, Several studies have appeared devoted to the investigation of the flexibility of polyimide molecules. Theoretical and experimental data indicate that these polymers have rather a high flexibility. " The Kuhn segment has been reported to consist of 2.5 monomer units. Also used to examine polyesterimides have been ultrasonic velocity and Rao formulism. ... 

Polyesterimides have been synthesized from the AW -bis-(jS-oxyethylimides) of pyromellitic acid and adipic acid, from anthraquinone derivatives yielding thermoplastic products, and from iV7V -bis(4-carboxyphthalimide)-3,3 -diphenyI alkyl phosphine oxide via acidolysis with aromatic diacetoxy compounds yielding self-extinguishing polymers and from bis(phthalimides) ... 

PontBtixan of miscible poli lends of phenol-formaldehyde (P-F) resins and polyesterimide (PEI) is ej ected from their polar nature. Miscibility in this system probably arises from the interaction between ester grov5>s of polyesterimide (PEI) with the phenolic hydroj ls and ether linkages, present in P-F resin. The structural similarity due to the presence of diphenylenanethane moiety CHo-< oV) in both the polymers may also play a role... 

When pure polyesterimide is heated v > to 400 C or above in air, no cxosslinking takes place. Hiis is evident from the complete solubility of the heated polymer in the same solvent as before. Novolac and resole, on the other hand, vdien heated to 200 C or above and 150 C or above, respectively in air for about 2 hrs., are found to be insoluble. Hiat the insolubility is due probably to the crosslinking of f ienolformaldehyde resins is further confirmed the swelling of heated novolac or resole in 10% aqueous NaOH solution. 

Polyamideimides from rosin are found to be soluble only in highly polar solvents such as m-cresol, DMF, DMSO, DMAC and NMP but not soluble in THF, cyclohexanone and 1,4-dioxane. This indicates that the solubility of polyamideimides is less than that of polyesterimides. Physical characteristics of both the polymers are shown in Table 3 and elsewhere ... 

We wish to follow the same technique of low temperature polycondensation for synthesis of polyamideimide from rosin. Accordingly, we have tried to react RMID with m-phenylene diamine in the presence of excess thionyl chloride at low temperature (0 -5 C). We failed to get any polymer. This may be due to low reactivity of carboxylic acid groups of RMID because of steric hindrance. The effect of bulky group on the reactivity of -COOH groups of RMID has also been observed earlier in the synthesis of polyesterimide . 

We have found that RMA appears to be a suitable substitute for TMA as a raw material for polymers. Rosin polymers such as polyeste-rimides via RMA or RMID or its derivative possess similar solubility and other characteristics to those synthesized from TMA. The thermal behavior of a polyesterimide (PEI-2) from rosin has been compared with that of TMA-based polyesterimides (Table 4). It is found from Table 4 that the thermal stability of the polyesterimide from RMA is similar to that of TMA. The glass transition temperature,... 

Another process to prepare polyesterimides by low temperature polycondensation is the reaction between RMIDC and a diol. This method will produce a similar type of polymer as prepared from the RMID and a diol. 

The applications of polyesterimides as heat resistant material has many advantages over the conventionally used polymers. This paper will summarize our research on the synthesis and characterization of two new polyesterimides from N-(4-carboxyphenyl) trimellitimide [7] and two other monomers, 4,4 -diacetoxybiphenyl [2] and cis-l,2-diacetoxy-3,5-cyclohexadiene [4] respectively. The physical, physicochemical and thermal properties of the polymers have been investigated. The monomers [2] and [4] have been prepared via enzymatic reactions from commercially available inexpensive starting materials followed by acetylation. This shows, in general, the potential of biotechnology on the development of new polymers, and heat resistant polymers in particular. 

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