Gas‐transport properties in crosslinked polymers. I. Aliphatic polyurethane–acrylate‐based adhesives

The gas-transport properties of one of a family of well-known adhesives, Loctite 350®, were studied. Permeability, solubility, and diffusivity coefficients, together with the activation energies of diffusion and permeation and the solution enthalpy, were determined from 20 to 40 °C for oxygen, nitrogen, carbon dioxide, and methane. Loctite 350® showed relatively high permselectivity and permeability for the gas pairs O2/N2 and CO2/CH4, especially for the former. The possibility of preparing very thin layers on various kinds of supports from these photocurable polymers makes them promising materials for gas-separation devices.