What are the effects of prolonged moisture exposure on the structural integrity of polypropylene?

Prolonged moisture exposure significantly impacts the structural integrity of polypropylene, a widely used thermoplastic polymer. When polypropylene is subjected to continuous moisture, it undergoes hydrolytic degradation, which weakens its molecular bonds. This process leads to reduced tensile strength, increased brittleness, and surface cracking over time. Additionally, moisture absorption can cause dimensional instability, warping, and loss of mechanical properties. In industrial applications, these effects compromise the material's durability, making it unsuitable for long-term use in humid environments. Understanding these degradation mechanisms is crucial for selecting appropriate materials or implementing protective coatings to enhance polypropylene's resistance to moisture-induced damage.