Ultrasound-assisted melt mixing for the preparation of UHMWPE/OMMT nanocomposites

Abstract

Ultrahigh molecular weight polyethylene (UHMWPE)/organic montmorillonite (OMMT) nanocomposites were prepared via a self-made vane mixer which could supply a synergy of ultrasound and extensional deformation. Structure and working principle of this novel mixer were illustrated in detail. Effects of the OMMT content, mixing time, and ultrasound treat time on composites’ morphology, rheological properties, and thermal properties were reported in terms of transmission electron microscopy (TEM), wide-angle X-ray scattering, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). X-ray diffraction (XRD) and TEM showed that the OMMT lay spacing increased from 2.82 nm to 3.29 nm and OMMT dispersed evenly in the matrix using this novel melt mixing equipment. It certified that the melt mixing procedure synergized by ultrasound and extensional deformation was very effective in the exfoliation of silicate layers and also the filler distribution and dispersion. DSC measurements revealed that the crystallization temperature ( Tc) had no visible change with increasing the OMMT content and the melting temperature ( Tm) and melting enthalpy crystallinity ( Xc) increased with the proper OMMT content. The higher Tm and Xc showed with the proper ultrasound treatment time, however, the Tc had no visible change. TGA showed that the onset temperature at which 20% weight loss of the material increased markedly in the case of UHMWPE/OMMT-1 wt% nanocomposite. The onset temperature slightly decreased with the use of ultrasound. Rheological analyses showed that all the samples exhibited non-Newtonian and shear thinning characteristics. Both the storage modulus and complex viscosity increased with continuous addition of the OMMT layers. It also indicated that the introduction of ultrasound tended to decrease the storage modulus and complex viscosity. Universal tensile test indicated that superior tensile strength occurred in samples containing OMMT layers.

Study on the Impact of a Combination of Synthetic Wollastonite and 2-Mercaptobenzothiazole-Based Fillers on UHMWPE Polymeric Matrix

“…UHMWPE possesses high strength and chemical resistance, sufficient wear resistance, and a low friction coefficient [4][5][6]. Moreover, a wide range of operational properties of UHMWPE composite materials can be achieved by adding different fillers [7,8] and using different technological methods for matrix modification: ultrasonic processing [9,10], radiation modification [11,12], and mechanical stimulus in a planetary mill [13,14]. However, in most cases, these methods do not lead to a significant improvement in the complex of mechanical and tribological properties.…”

Development of pulsating extensional stress induced melt mixer and its application for polypropylene/carbon fibers composites

“…Zhai 45 used this device to prepare PP matrix composites, which had good compatibility and significant mechanical properties. Yin 46 and Yu 47 designed a laboratory-scale vane mixer (VM). Depending on the uniquely designed eccentric shaft and vanes to generate a periodic extensional flow, the VM realizes a short-process circulating flow of material, which effectively reduces the working space.…”

Development of reduced Graphene oxide modified Ultrahigh molecular weight polyethylene (rGO/UHMWPE) based Nanocomposites for Biomedical Applications

“…Thus, finds suitable to be used in various biomedical industries. Liang et al 25 explored the growth of organic montmorillonite (OMMT) clay-filled UHMWPE nanocomposite by Ultrasound-assisted melt mixing. It showed that melt mixing with ultrasonic and extensional deformation was beneficial in silicate layer exfoliation, filler distribution, and dispersion.…”