No abstract

A two-dimensional molybdenum disulfide (MoS 2 ) nanosheet, as a new type of inorganic material with high hydrophobicity and excellent physicochemical stability, holds great application potential in the preparation of a high separation performance organic− inorganic hybrid membrane. In this work, high hydrophobic MoS 2 was embedded in hydrophobic polyether copolymer block amide (PEBA) to prepare PEBA/MoS 2 organic− inorganic hybrid membranes. The structure, morphology, and hydrophobicity of the hybrid membrane were characterized by scanning electron microscopy, thermogravimetric analysis, contact angle goniometry, X-ray diffraction, infrared spectroscopy analysis, and atomic force microscopy. The effect of embedding of MoS 2 on the swelling degree and pervaporation separation performance of the PEBA/MoS 2 hybrid membrane was studied with a 1.0 wt % pyridine dilute solution. The results indicated that with increasing the MoS 2 content, the separation factor of PEBA/MoS 2 increased first and then decreased, while it showed a downward trend in the permeation flux. When the MoS 2 content in the PEBA/MoS 2 hybrid membrane was 10.0 wt %, the permeation flux was 83.4 g m −2 h −1 (decreased by 21.5% compared with the pure PEBA membrane), and the separation factor reached a maximum value of 11.11 (increased by 37.6% compared with the pure PEBA membrane). Meanwhile, the effects of feed temperature on the pervaporation separation performance of PEBA/MoS 2 hybrid membranes were also studied. In addition, as the PEBA/MoS 2 hybrid membrane has excellent thermal stability, it is expected to be a promising material for recovering pyridine from wastewater.

No abstract

Polymer processing requires reliable monitoring equipment to ensure product quality, improve energy efficiency and apply advanced control strategies. This work tests an instrumented annular duct as a nozzle on the downstream side of the screw‐barrel to analyze the thermal behavior of the polymer flow in an injection molding machine. The plasticization step is first studied, and then virtual injection molding cycles are performed. The measurements via the instrumented annular duct show that the melt temperature decreases during fast production, due to the lack of residence time in the barrel for the material to be sufficiently heated by conduction. The instrumented annular duct also enables detection of changes in melt temperature over time during a single injection. Moreover, the experiments prove the robustness of the temperature measurements in an annular geometry for process monitoring.

No abstract

No abstract

No abstract

To overcome the inlet temperature uncertainties during an in-line thermo-rheological characterization and to further apply a differential convection method for an injection molding process, a concept of device designing is proposed in this work. An analytical and numerical investigation proves that the proposed concept can provide information on the viscosity of the material via thermal measurements, despite a poorly known inlet temperature.