Aromatic polyamides rheology

Blends of PET/HDPE have been treated previously in the literature [157, 158]. These are immiscible, but the addition of compatibilizers improves the mechanical properties of the blend, such as styrene-ethylene/butylene-styrene (SEBS) and ethylene propylene diene monomer (EPDM) [157], MAH [158], Poly(ethylene-stat-glycidyl metha-crylate)-graft-poly(acrilonitrile-stat-styrene) (EGMA), poly (ethylene acrylic acid), and maleated copolymers of SEBS, HDPE, ethylene-propylene copolymer (EP). The addition of compatibilizers modifies the rheological properties of blends of PET with HDPE, in such a way that increases in viscosity are observed as the component interactions augment. Changes in crystallization of PET were evaluated in blends with Polyphenylene sulfide (PPS), PMMA, HDPE aromatic polyamides, and copolyesters [159]. 

H. Aoki, J.L. White, and J.F. Fellers, "A Rheological and Optical Properties Investigation of Aliphatic (Nylon 66, P BLG) and Aromatic (Kevlar, Nomex) Polyamide Solutions," J. Appl. Polym. Sci. 23, 2293-2314 (1979). 

The influence of mesomorphic polymer components on the morphological, physical, and rheological properties of blends with polyester, polyamide, polycarbonate, and polyolefin matrix has been investigated in several cases [115]. Studies on blends of PET, PBT, PC, PS with main chain liquid crystal polymers and copolymers of various type (including flexible LC copolyesters and wholly aromatic LC copolyesters) showed that the phase transitions and properties were largely dependent on the chemical structure, molar mass, processing conditions, and concentration of components [132-134]. Generally, these systems displayed phase separation in the molten... 

Aromatic hb polyamides have been used to modify the thermal, dielectric, viscoelastic, and rheological properties of linear polyamides [253, 254]. The characteristic architecture of these macromolecules makes them interesting candidates as a blend component with commercial linear polymers. A hb poly(ether amide) was blended with commercially available polyamide-6 (PA6) by Huber et al. [255] and Clausnitzer and coworkers [256]. The complex melt viscosity of the new materials was reduced, even at small amounts of the hb polymer, whereas the... 

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