Which of the following represents glyptal?

Among the following,the biodegradable polymer is $.....$

Which among the following polymers is heat resistant and used to obtain oil seals?

The polydispersity index $(PDI)$ of a polymer is ($\bar{M}_w = \text{weight average molecular mass}$ and $\bar{M}_n = \text{number average molecular mass}$)

Nylon $6, 6$ is:

Which polymer is commonly used in nonstick cookwares?