Untitled

Abstract

Recently, the development of high-performance thermoplastic polymer composites has been a focus for the polymer engineering field. These polymer composites are formulated with polymer blends and alloys and various fillers. Twin-screw extruders can provide excellent mixing for these composites. The filler dispersion depends on processing conditions such as processing temperature, residence time, screw speed and screw profile. The physical properties of these polymer composites are also strongly dominated by the dispersion conditions of the filler.In this study, conductive carbon-nanotube (CCNT) was used as a filler and polycarbonate (PC) as the matrix polymer. The conductivity of these composites was measured and related to the dispersion of CCNT under different processing conditions. The dispersion was characterized by the dispersion ratio. The total shear strain [r • t ] , the product of shear rate [11 and residence time distribution [t ] , was used as a dispersion parameter.We can conclude that the filler dispersion depends on the processing parameters of the twin screw extruder. Moreover the filler dispersion can be related to the total shear strain [r • t ] which is one of the dispersion parameters. An optimized condition for conductivity in these carbonnanotube (CCNT) filled polymer composites can be determined by this correlation.

Synergetic toughening of poly(phenylene sulfide) by poly(phenylsulfone) and poly(ethylene‐ran‐methacrylate‐ran‐glycidyl methacrylate)

“…This batch‐type mixer, designed to render a high shear rate of molten polymers has the following dimensions: Internal volume of 70 cc, cylinder inner diameter of 47.7 mm, respective disc long and short axis diameters of 46.9 and 29.3 mm, and clearance between the disc, and the wall of 0.4 mm. It is known that the shear rate ( S ) in melt mixing can be calculated according to the following equation 18 : where N is the number of screw rotations per s, h is the clearance between the disc and the wall surface of the mixer, and D m is the difference between the inner diameter of the cylinder and the long axis diameter of the disc. The shear rate of the mixer ( S ) in this study was estimated to be 1.2 × 10 3 /s at its highest point, indicating that the PPS blends in the present study were prepared under very high shear rates.…”

“…This batch-type mixer, designed to render a high shear rate of molten polymers has the following dimensions: Internal volume of 70 cc, cylinder inner diameter of 47.7 mm, respective disc long and short axis diameters of 46.9 and 29.3 mm, and clearance between the disc, and the wall of 0.4 mm. It is known that the shear rate (S) in melt mixing can be calculated according to the following equation 18 :…”

Monitoring the Production of Polymer Nanocomposites by Melt Compounding with On-line Rheometry

“…In the case of organoclays, intercalation and exfoliation into the polymer matrix is mandatory (Dong and Bhattacharyya, 2008;Yoo and Paul, 2008), whereas for CNT full dispersion is important for mechanical reinforcement, but the presence of some aggregates might be favourable for electrical conductivity (Takase et al, 2002;McNally and Pötschke, 2011). Dispersion is influenced by material and processing parameters.…”

Properties of Poly (Carbonate)/Vapor-Grown Carbon Fiber Composite Prepared by Melt compounding

“…Polystyrene (PS), Polycarbonate (PC), Polymethyl methacrylate (PMMA). Takase et al [18,19] Traditional polymer processing of twin screw extrusion has been widely used in melt compounding process, which provided uniform fiber dispersion by the large shear forces during processing [23].…”