Rheological behavior of fiber-filled polymer melts at low shear rate. Part. I. Modeling of rheological properties

Abstract

In this review the models applied for the description of non-Newtonian liquids were presented. Highly filled polymer melts showing distinct yield stress are such liquids. The effects of forces of geometrical and physical interactions among the filler particles on the properties were discussed. These interactions forces depend on the type, size and shape of filler particles and in case of fibers also on their orientation. The deformations and flow of fibers assemblies in the melt under shear stress were discussed. The equations used for description of three-or two-dimensionally oriented fibers sets are presented. Key words: polymer melt, filler, modeling of rheological properties, viscosity, yield stress, shear rate.CHARAKTERYSTYKA REOLOGICZNA W ZAKRESIE MA£YCH SZYBKOOECI OECINANIA STOPÓW POLIMERÓW NAPE£NIONYCH W£ÓKNAMI. Cz. I. MODELOWANIE W£AOECIWOOECI REOLO-GICZNYCH Streszczenie -W pracy przegl¹dowej przedstawiono modele stosowane do opisu w³aoeciwooeci reologicznych cieczy nienewtonowskich, którymi s¹ stopy polimerów o wysokim stopniu nape³nienia wykazuj¹ce wyraŸn¹ granicê plastycznooeci. Omówiono wp³yw na omawiane w³aoeciwooeci si³ oddzia-³ywañ geometrycznych i fizycznych miêdzy cz¹stkami nape³niacza. Si³y tych oddzia³ywañ zale¿¹ od rodzaju, wielkooeci i kszta³tu cz¹stek nape³niacza, a w przypadku w³ókien, tak¿e od ich orientacji. Przedyskutowano tak¿e deformacje i przep³yw zespo³ów w³ókien w stopie pod wp³ywem naprê¿eñ oecinaj¹cych. Przedstawiono równanie stosowane w przypadku zespo³ów w³ókien o orientacji trójwymiarowej oraz dwuwymiarowej. S³owa kluczowe: stop polimeru, nape³niacz, modelowanie w³aoeciwooeci reologicznych, lepkooeae, granica plastycznooeci, szybkooeae oecinania.

Thermal Properties of Hemp Fiber Reinforced Plant-Derived Polyamide Biomass Composites and their Dynamic Viscoelastic Properties in Molten State

“…It was found that the mechanical and tribological properties of these composites are improved when filled with hemp fibers and surface-treated using silane coupling agent. However, in order to further enhance the mechanical, thermal, and tribological properties of the short natural fiber-reinforced biopolymer composites, it is very important to understand the thermal properties of these biomass composites and their dynamic viscoelastic properties in molten state such as process ability, heat resistance, crystallinity, internal adhesion, internal microstructures, and changes and structure-property relationships [19][20][21]. The aim of this study is to experimentally investigate the thermal properties of hemp fiberfilled plant-derived polyamide 1010 composites and their dynamic viscoelastic properties in the molten state.…”

Rheological Properties of Carbon Nanofiber-Filled Polyamide Composites and Blend of these Composites and TPE

“…However, to further enhance the mechanical, electrical, processability, tribological properties, etc. in these CNF-filled thermoplastic composites, it is very critical to understand the rheological behavior of these thermoplastic composites in the molten state such as processability, internal microstructure, changes, and structure-property relationships [23][24][25].…”