Nylon 66/clay nanocomposite structure development in a twin screw extruder

Abstract

Nylon 66/clay nanocomposites were prepared in a Berstorff ZE25A UTX Ultra-glide corotating twin screw extruder at 2708C. Two types of extruder configurations with different mixing sections were used. One comprised two kneading block sections in the screws (KB only) and the other had a combination of a multiprocess-element (MPE) section and a kneading block section. Samples at eight different locations along the extruder screw were obtained and analyzed using scanning electron microscope and transmission electron microscope to examine the morphology development of clay inside nylon down the length of the extruder. It is found that the clay aggregates are quickly broken into smaller tactoids (micron size) and then even much smaller clay bundles (nanometer size) and single clay platelets in the first mixing section. The structure changes in the second mixing section are much less significant. X-ray diffraction (XRD) analysis of the nanocomposite products showed small, or disappearance of, characteristic XRD (001) peaks, which indicates partial exfoliation, or complete exfoliation,

Microstructure, thermal, physico–mechanical and tribological characteristics of molybdenum disulphide‐filled polyamide 66/carbon black composites

“…The wear behavior of a polymer in dry sliding condition is strongly influenced by its ability to form a transfer film on the counterface [30, 31]. The transfer films provide a shielding of the soft polymer surface from the hard metal asperities [15, 16, 32–35]. This study revealed that anti‐wear properties of PA 66/CB composites are improved markedly after incorporation of MoS 2 .…”

In Situ Polymerization of Nylon 66/Reduced Graphene Oxide Nanocomposites

“…It was obvious that the pure PA66 in Figure 8(a) displayed only one melting peak and the PA66/rGO nanocomposites exhibited two melting peaks. According to the report of Lin et al [34], the pure PA66 showed only one melting temperature (T mI ) at around 260°C, which is the temperature found for Form I or the α-type peak [35]. The second melting temperature (T mII ) detected was at around 252°C which was attributed to Form II or the γ-type peak.…”

Applications of micro-scale combustion calorimetry to the studies of cotton and nylon fabrics treated with organophosphorus flame retardants

“…9B shows two peaks. The first sharp peak at 253 • C is due to melting [32]. The 2nd broad peak around 450 • C is obviously due to decomposition of nylon.…”