what is the value of degree of polymerization of

isotactic PB with a molecular weight of 3.091e5 g/mol

To determine the degree of polymerization (DP) of a polymer, you need to know its molecular weight and the molecular weight of the repeating unit.

In the case of isotactic polybutene (PB), we are given the molecular weight of the polymer (3.091 × 10^5 g/mol). However, we need to know the molecular weight of the repeating unit.

The molecular weight of the repeating unit of PB can be calculated by dividing the molecular weight of the polymer by the number of repeating units in one polymer chain.

Unfortunately, the molecular weight of the repeating unit of isotactic PB is not provided in the given information. Without this information, it is not possible to calculate the degree of polymerization.

To find the value of the degree of polymerization, you will need to know the molecular weight of the repeating unit or additional information that can help determine the number of repeating units in the polymer chain.