Prediction of Surface Segregation of Fluorinated Additives from Measurement of Wettability Properties of Polymer-Based Blends.

The aim of this work is to describe the segregation phenomenon of random perfluorinated copolymers toward the surface of a polystyrene (PS) matrix. Three random perfluorinated copolymers, named POISE-a (Polymer prOcessing Interface StabilizEr), synthesized with different amounts of chemically bound fluorine, were mixed with a commercial PS matrix by a solvent casting process. Their effect on the wettability properties of PS as a function of their concentration was measured first under static conditions with different liquids (water, formamide, diethylene glycol) and then under dynamic conditions with water.

What is the utility of measuring gaseous Hg dry deposition using Aerohead samplers?: A review.

The most efficient way to quantify Hg inputs to ecosystems is to measure wet and dry deposition. Wet deposition of Hg is determined by measuring Hg concentrations and the volume of precipitation. Dry deposition of Hg is determined through direct measurement and/or determined indirectly by measuring air concentrations and using model-generated deposition velocities.

Single-gas and mixed-gas permeation of N/CH in thermally-rearranged TR-PBO membranes and their 6FDA-bisAPAF polyimide precursor studied by molecular dynamics simulations.

High-performance polymers with polybenzoxazole (PBO) structures, formed thermal rearrangement (TR) of aromatic polyimide precursors, have been developed for gas separation applications. The present work compares the transport of N and CH in a 6FDA-bisAPAF polyimide precursor and in its TR-PBO derivative using molecular dynamics (MD) simulations. The modelling closely mimicked the experimental approach by transforming a 6FDA-bisAPAF atomistic model into its corresponding TR-PBO structure a specific algorithm.

Complementary Approaches for Enhancing Polystyrene Hydrophobicity: Additives Development and Replication of Micro/Nanotextures.

This work aims at developing polymer surfaces with enhanced hydrophobicity by controlling both the surface chemistry and the surface structure. As a first step, a chemical surface modification is achieved by the incorporation of a synthetized tailored fluorinated copolymer, named POISE-a (Polymer prOcessing Interface StabilizEr), in a commercial polystyrene matrix. Then, a complementary physical approach based on micro-structuration of a polymer surface is used.