On the measurement of the high rate flow properties of organo-clay platelet filled polyamide 6 melts by capillary rheometer

Measurement of the high rate flow properties of filled HDPE melts by capillary rheometer: Effects of the test geometry

“…In support of the above discussion is the observation that the results obtained here for the talc compound with the two different die diameters (discussed below) are opposite to what is expected in the presence of slip at the capillary wall [27], suggesting that wall slip should not give a contribution to the apparent viscosity decrease, with respect to the neat HDPE. Also, in the presence of nano-platelets (silicate layers) dispersed in a polymer melt, a decrease in viscosity with respect to the unfilled polymer has been observed [12,14,28].…”

“…It has been shown that, for a polymer melt filled with discontinuous glass fibres, the converging flow at the die entrance aligns the fibres, and the extent of the alignment process, which is reflected in the value of DP ent , is governed by the aspect ratio of the fibres [11,13]. The role played by the rigid particles in the converging flow of a polymer melt filled with lamellar particles could be interpreted by analogy with the action exerted by discontinuous glass fibres e this has been proposed even in the presence of nano-platelets (silicate layers) [12,14]. Thus, the increase in DP ent observed for GF and talc compounds, with respect to the unfilled melt, might be explained as the consequence of the alignment processes of the highly anisotropic rigid particles during converging flow in the die entrance region.…”

Effects of Functional Additives on Structure and Properties of Polycarbonate-Based Composites Filled with Hybrid Chopped Carbon Fiber/Graphene Nanoplatelet Fillers

“…Furthermore, rheometers such as modular compact rheometer or capillary rheometer have been extensively applied to study the linear or non-linear viscoelastic rheological properties of polymeric melts and solutions for many years. [35][36][37][38] In this work, the effects of rheology modifier (SAN) and flame retardant (RXP) on the structures and rheology, and mechanical performances of PCbased composites were investigated. The flammability was evaluated by UL-94 and limiting oxygen index tests.…”