Consider the Polydispersity Index (PDI), defined as the ratio of weight average to number average molecular mass (). Which of the following statements is strictly correct regarding polymer systems?

Question

Consider the Polydispersity Index (PDI), defined as the ratio of weight average to number average molecular mass ($M_w/M_n$). Which of the following statements is strictly correct regarding polymer systems?

Prashant Kotian · Accepted Answer

Correct answer: B. Natural polymers (like pure biological proteins) have chains of exact, uniform lengths, meaning and PDI = 1. Synthetic polymers invariably have a distribution of chain lengths, so and PDI > 1.

💡 Solution & Explanation

Practice 22,000+ questions like this