Polyamide

The physiochemical properties of reserve osmosis (RO) and nanofiltration (NF) polyamide (PA) membranes are largely determined by their PA chemistry and coatings, if any. Knowledge on such inherent relationship is critically needed in advancing membrane technology. This paper presents a consistent an

The “adsorption Á amphoteric” model is used to investigate the role of the main phenomena determining the mechanism of the membrane charge formation in nanofiltration membranes. The prevailing mechanisms considered are: acid/base dissociation of the hydrophilic groups of the membrane, counter-ion si

The chlorine resistance of polyamides synthesized using various diamines and acid chlorides was investigated. The retention ratio of molecular weight and the polymer weight loss after the immersion in chlorine solution were used as the evaluation for chlorine resistance. The influence of the diamine

In this article, three types of aromatic polyamides were prepared by the direct polycondensation of bis[4-(4aminophenoxy) phenyl] diphenyl methane (BAPDM) with various of aromatic diacids such as terephthalic acid (TPAc), 5-tert-butylisophthalic acid (TBPAc), and 4,4N-hexafluoroisopropylidenedibenzo