Deteksi Migrasi Material Pembungkus Makanan ke Air karena Pemanasan

This research was aimed to detect if migration of additives or other components from plastic material used as packaging of hot food/drinks were occurred in warm-hot cooked temperature. In this works, plastic samples as like spoon, packaging, and wraps were taken directly from mainly street food vendors and shops. Pure water and plastics samples were mixed, and heat were introduced to induced migration. Three temperature of 60 °C, 80 °C, dan 100 °C, were each applied to induced migration for one hour. Migrations were detected using UV-Visible Spectroscopy, Fourier Transform InfraRed, and Gas Chromatography. Migrated polymer materials from plastics were detected through peaks of UV-visible absorption with water as background spectra were subtracted, and its functional groups were detected using FTIR spectroscopy. Gas chromatography was used to confirm if UV-visible and FTIR results were result from single component migration. Keywords: polymer, migration, temperature, plastics, wavelength.

Correction: The effect of wall depletion and hydrodynamic interactions on stress-gradient-induced polymer migration

Correction for ‘The effect of wall depletion and hydrodynamic interactions on stress-gradient-induced polymer migration’ by Hossein Rezvantalab et al., Soft Matter, 2016, 12, 5883–5897.

Stress-gradient-induced polymer migration in Taylor–Couette flow

This work applies our recent theory for stress-gradient-induced migration to Taylor–Couette flow, and has for the first time confirmed the theory using Brownian dynamics simulations.

The effect of wall depletion and hydrodynamic interactions on stress-gradient-induced polymer migration

Predicting the stress-gradient-induced migration of polymers in presence of solid boundaries: continuum theory and mesoscopic simulations.

Interdiffusion behavior under a temperature gradient field in a poly(ethylene-co-hexene)/poly(ethylene-co-butene) system

The in-plane thermal gradient accelerates polymer migration through the enhancement in polymer diffusion along the direction of the temperature gradient.

Viscosity Variation of Polymer Solution through Low Permeability Cores

Viscosity loss occurs in polymer flooding in middle and high permeability reservoir. For larger specific surface and more clay in low permeable rock, the actual viscosity of polymer solution is more important. Polymer cores’ flow experiments are reported which were performed using long natural geological outcrop sands cores. These cores were in good simulation of natural cores and the length of cores allows viscosity variation mechanisms that occur when polymer solution flows through long distance. These mechanisms can not be assessed by silica cores of conventional length. Results of polymer cores’ flow experiments gives viscosity of polymer solution after it through different permeability cores, and the effects of molecular weight, concentration of polymer, migration distance, permeability, and injection velocity on viscosity loss rate. Results show the molecular weight and concentration of polymer is higher, or the core’s permeability is lower, and the viscosity loss of polymer solution through cores is greater. Injection velocity is found to be insignificant within 15m/d for polymer with middle or low molecular weight. This simulation work confirms the viscosity loss mechanism for one polymer in low permeable cores.