The present invention provides a method for analyzing diffusion coefficients of solvent molecules in polymer materials by applying a diffusion coefficient analysis model using 4 descriptors related to solvent properties. The present invention can provide optimum solvents when it is necessary to screen solvents suitable for drying procedure in the preparation of polymer films using a solvent process or it is necessary to analyze the permeability of polymer materials used in the final products by effectively analyzing the diffusion coefficients of solvent molecules.

Methods and systems for detecting membrane blockage in a gas detector are disclosed. In some embodiments, the gas detector comprises a membrane configured to define a sensing chamber of the gas detector. The gas detector further comprises a strain sensor operatively connected to the membrane, the strain sensor configured for generating output signals related to strain in the membrane. The gas detector comprises a controller operatively connected to the strain sensor. The controller is configured to: determine a strain in the membrane based on the output signals; and determine a condition of the membrane based on the determined strain, wherein the determined condition indicates whether the membrane is blocked.

Disclosed is a system for measuring mass transfer in a membrane and solutions. The system includes: a membrane module 10 including a feed solution reservoir 11 accommodating a feed solution f, a draw solution reservoir 13 accommodating a draw solution d whose osmotic concentration is higher than that of the feed solution f, and a holder 15 supporting a semipermeable membrane m arranged between the feed solution reservoir 11 and the draw solution reservoir 13 and whose performance is to be measured; a feed solution storage tank 20 storing the feed solution f; and a feed solution supply pump 30 supplying the feed solution f from the feed solution storage tank 20 to the feed solution reservoir 11 at a fixed flow rate corresponding to a water flux WF across the membrane m such that the water flux WF is maintained constant.

A measuring method includes: placing resist 20 on a surface of a test film; pressing a template 30 against the resist 20 placed on the surface of the test film; measuring a size of a void formed in the resist 20 after pressing the template 30 against the resist 20; and determining gas permeability of the test film based on the size of the void.

The present invention relates to a method for measuring metal ion permeability of a polymer film, comprising the steps of applying a voltage to the polymer film, while at least one side of the polymer film is brought into contact with an electrolyte comprising metal ions, an organic solvent and an aqueous solvent; and measuring the change rate of resistance or change rate of current of the polymer film according to time, after the voltage is applied, and a device for measuring metal ion permeability of a polymer film used therefor.

A system for building a gas processing apparatus includes a compressed gas source, a pressure modulator in communication with the gas source, and a chamber configured to receive a gas permeable material. The chamber is further configured with a first chamber area on one side of the material and with a second chamber area on a second side of the material. A sensor is configured to measure over time a pressure differential between the first and second chamber areas. A memory stores performance characteristic data for a plurality of gas processing apparatus. A processor converts the pressure differential to a material characteristic of the gas permeable material, and compares the material characteristic to at least one selected performance characteristic of the gas processing apparatus.

An apparatus for evaluating gas barrier properties, containing a polymer-containing support for supporting a sample, a chamber on a permeation side, and a detection unit, in which the support is connected with an opening of the chamber on the permeation side, and in which glass transition point of the polymer contained in the support is 100° C. or higher.

A detection method and system includes applying a gas to an article, the article including a gasochromic material capable of emitting a radiation emission spectrum in the presence of the gas, the article further including a first absorptive material capable of absorbing radiation in a first narrow bandwidth within the emission spectrum to produce a first narrow bandwidth absorption line in the emission spectrum, irradiating the article in the presence of the gas; and detecting the emission spectrum having the first narrow bandwidth absorption line.

Gypsum panels, sheathing systems, and methods of making and using the same are provided. A gypsum panel includes a gypsum core associated with a first fiberglass mat having a continuous barrier coating, the coating penetrating a portion of the first fiberglass mat opposite the gypsum core, wherein gypsum penetrates a remaining fibrous portion of the first fiberglass mat such that voids in the first fiberglass mat are substantially eliminated. A building sheathing system includes at least two gypsum panels and a seaming component to provide a seam at an interface between the gypsum panels.

There is provided an evaluation method for permeability of a porous membrane that separates a first flow channel and a second flow channel, the evaluation method including supplying a pressure to a liquid inside the first flow channel and acquiring a change that occurs in a liquid accommodated in the second flow channel as an evaluation indicator of permeability of the porous membrane.