The application, continued performance, and degradation behavior of polymers often depends on their interaction with small organic or gaseous volatiles. Understanding the underlying permeation and diffusion properties of materials is crucial for predicting their barrier properties (permeant flux), drying behavior, solvent loss or tendency to trap small molecules, as well as their interaction with materials in the vicinity due to off-gassing phenomena, perhaps leading to compatibility concerns. Further, the diffusion of low M_w organics is also important for mechanistic aspects of degradation processes. Based on our need for improved characterization methods, a FTIR-based spectroscopic gas/volatile quantification setup was designed and evaluated for determination of the diffusion, desorption and transport behavior of small IR-active molecules in polymers. At the core of the method, a modified, commercially available IR transmission gas cell monitors time-dependent gas concentration. Appropriate experimental conditions, e.g. desorption or permeation under continuous flow or static gas conditions, are achieved using easily adaptable external components such as flow controllers and sample ampoules. This study presents overview approaches using the same IR detection methodology to determine diffusivity (desorption into a static gas environment, continuous gas flow, or intermittent desorption) and permeability (static and dynamic flow detection). Further, the challenges encountered for design and setup of IR gas quantification experiments, related to calibration and gas interaction, are presented. These methods establish desorption and permeation behavior of solvents (water and methanol), CO₂ off-gassing from foam, and offer simultaneous measurements of the permeation of several gases in a gas mixture (CO₂, CO and CH₄) through polymer films such as epoxy and Kapton. They offer complementary guidance for material diagnostics and understanding of basic properties in sorption and transport behavior often of relevance to polymer degradation or materials reliability phenomena.

聚合物的应用，持续性能和降解行为通常取决于它们与少量有机或气态挥发物的相互作用。了解材料的基本渗透和扩散特性对于预测其阻隔性能（渗透通量），干燥行为，溶剂损失或捕获小分子的趋势以及由于放气现象而与附近材料的相互作用至关重要，也许导致兼容性问题。此外，低M _w的扩散有机物对于降解过程的机械方面也很重要。基于我们对改进的表征方法的需求，设计并评估了基于FTIR的光谱气体/挥发物定量设置，用于确定聚合物中小的IR活性分子的扩散，解吸和传输行为。该方法的核心是一种经过修改的可商购的红外透射式气室，它可以监测随时间变化的气体浓度。使用容易适应的外部组件（例如流量控制器和样品安瓿瓶）可以实现适当的实验条件，例如在连续流或静态气体条件下的解吸或渗透。这项研究提出了使用相同的IR检测方法确定扩散率（在静态气体环境中的解吸，连续气体流量，或间歇性解吸）和渗透率（静态和动态流量检测）。此外，还介绍了与标定和气体相互作用有关的IR气体定量实验的设计和设置所遇到的挑战。这些方法建立了溶剂（水和甲醇），CO的解吸和渗透行为₂从泡沫中释放出气体，并提供同时测量混合气体中几种气体（CO ₂，CO和CH ₄）通过聚合物膜（例如环氧树脂和Kapton）的渗透率的信息。它们为材料诊断和了解吸附和传输行为的基本特性（通常与聚合物降解或材料可靠性现象相关）提供了补充指南。