How does the molecular weight distribution of polypropylene influence outdoor durability?
The molecular weight distribution (MWD) of polypropylene plays a critical role in determining its outdoor durability. A broader MWD often enhances mechanical strength and resistance to environmental stressors like UV radiation, heat, and oxidation. High-molecular-weight chains improve toughness, while low-molecular-weight fractions may increase susceptibility to degradation. Uniform distribution can balance flexibility and stability, but uneven MWD may lead to premature cracking or brittleness under prolonged outdoor exposure. Optimizing MWD is key to extending the lifespan of polypropylene in harsh conditions.
