Improvement of processing and mechanical properties of polyetherimide by antiplasticization with resorcinol bis(diphenyl phosphate)

Abstract

This article describes the antiplasticization of a commercial polyetherimide ULTEMV R series 1000 [poly(bisphenol A-co-4-nitrophthalic anhydride-co-1,3-phenylenediamine) by resorcinol bis(diphenyl phosphate)] (RDP) and its implications on the thermomechanical processing, namely extrusion and injection molding, as well as on the thermal and mechanical properties of the formulations. This antiplasticization effect allows the processing of polyetherimide formulations at lower temperatures in comparison with neat polymer due to the progressive decrease of the glass transition temperature with increased RDP concentration, as observed by differential scanning calorimetry and dynamic mechanical analysis. The decrease of T g occurs concomitantly with the overlap of the glass transition and b relaxation and with the shift of the c relaxation to higher temperatures. These changes in the relaxation spectrum of polyetherimide formulations are possibly responsible for the increase of the tensile strength and Young's modulus and changes in the fracture mechanism, as observed by stress-strain tests and by scanning electron microscopy, respectively. V C 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40619.

Phosphorus esters of1‐dopyl‐1,2‐(4‐hydroxyphenyl)ethene as effective flame retardants for polymeric materials

“…In contrast, the presence of BDE‐DOPO in the blends increases Tg. An increase in Tg may reflect antiplasticization or reinforcement effects 38‐41 …”

“…Antiplasticization is caused by a more ordered structure of the host polymer as a result of blending with additives 38,39 . It usually is observed with low levels of molecules in the material which can restrict the movement of polymer chains rather than increase free volume.…”

Poly(ether imide)s with tailored end groups

“…Overall, end group modification proves to be an easy and effective method to improve the thermal, rheological, and tensile properties. For example, compared to the method of adding resorcinol bis(diphenyl phosphate) to high‐MW PEIs, which severely jeopardized the thermal stability, 57 our zinc sulfonated PEIs and phosphonium functionalized PEIs maintained a high‐thermal stability and T g , as well as easy processability.…”