Membrane technology is an alternative to be used in protective clothing. The goal is to reduce heat stress of the wearer by finding a membrane that let water vapour through, but not chemicals. During spring 2001 membranes were made at DERA Porton Down from diallylamine monomers. Five different monomers were used and the membranes were tested for permeation of water vapour and mustard gas. The aim was to see how the different structures of the diallylamines affect the permeation of the membranes and if it was possible to mix diallylmonomers and produce membranes with permeation characteristics inbetween the characteristics of the membranes made from the separate monomers.