Moisture Affinity
Chemical compounds with a high affinity for water molecules absorb or transmit moisture through their molecular structure. These materials, known as hydrophilic polymers, are used in functional apparel to create breathable coatings and moisture-wicking finishes. They work by attracting water molecules and allowing them to pass through.
Chemical Structure
Polymeric chains containing polar functional groups, such as hydroxyl or carboxyl groups, can form hydrogen bonds with water. These hydrophilic polymers swell as they absorb moisture, creating microscopic pathways for vapor transport.
Fabric Application
Protective outerwear often incorporates a thin, solid membrane made of specialized plastics. This layer utilizes hydrophilic polymers to transport sweat away from the body while blocking liquid water from the outside. The result is a windproof and waterproof garment that remains comfortable during activity.
The polymer membrane is bonded to the outer fabric using a series of microscopic adhesive dots. This lamination maintains the flexibility and breathability of the garment.
Performance Testing
Laboratory assays measure the water vapor transmission rate of treated fabrics under controlled temperature gradients. The behavior of hydrophilic polymers depends on the relative humidity of the testing chamber. Consistent results are achieved by pre-conditioning the samples according to industry standards.
This evaluation ensures that the finished garments perform as expected in the field.
