In recent years, the impact of humidity on polymer materials has received special attention. One of the backgrounds is the impact of humidity factors on the reliability of equipment in the fields of microelectronics and micro-electromechanics, such as causing material expansion and deformation, causing bonding and cracking, and causing stress concentration. The second background is the aging problem of polymer materials in engineering applications. Aging will reduce the performance of polymer materials.
Effect of humidity on plastics
Considering the humidity factor, when the relative humidity is greater than 80%, the moisture in the air penetrates into the material or forms a water film on the surface of the plastic, which will reduce the performance of the plastic; when the relative humidity in the air is less than 50%, the moisture contained in the plastic will evaporate into the air, which will also change the performance of the plastic, making some plastics brittle and cracking.
The effect of humidity on plastic properties is mainly the process of penetration and absorption. At present, there are two main aspects of research on the impact of humidity on the structure and mechanical properties of plastics. On the one hand, it studies the material deformation and residual stress caused by expansion caused by humidity, including using constitutive or numerical simulation methods to study the penetration and diffusion of humidity and the structural stress and interface stress caused by uneven moisture content; on the other hand, it studies the impact of humidity and temperature on the physical properties of plastics, such as the impact on physical properties such as strength, density, modulus, and longevity.
The influence of ambient humidity on the mechanical functions of plastics is obvious. Generally, plastics that can absorb moisture are polar materials. These materials can generally form some types of bonds, which are most likely hydrogen bonds. Materials such as nylon are such materials. On the other hand, moisture has no effect on polyethylene or PTFE, and the performance of these plastics is almost inert to changes in ambient humidity.
Effect of humidity on nylon mechanical functions
Nylon material is a highly semi-crystalline thermoplastic with good physical and mechanical properties and is used in many industries. At the same time, all nylons are hygroscopic (humidity sensitive). This factor needs to be paid attention to in the selection of materials, design of plastic parts, prediction and optimization of mechanical properties, etc.
Yizen Plastic (Huizhou) Co., Ltd. is a company specializing in the production and sales of nylon PA6 semi-matt white material, PA6 glossy material, PA6 yellow material, and PA66 granules.
