Butene H2C=CH-CH2-CH3 can be reacted to form isotactic polybutene (PB).
(a) Would you expect isotactic polybutene to melt at a higher or lower temperature than atactic polybutene of the same molecular weight?
Higher T
Lower T
(b) Is isotatic polybutene a thermoplastic or thermoset?
Thermoplastic
Thermoset
(c) What is the value of the degree of polymerization n of isotactic PB with a molecular weight of 3.091×105 g/mol?
(a) Higher T
(b) Thermoplastic
(c) 5520
Thank you
all answers are correct
qwerty is the man
To determine the value of the degree of polymerization (n) of isotactic PB with a given molecular weight, we need to use the formula:
n = (Mw)/(Mm)
Where:
n = degree of polymerization
Mw = molecular weight of the polymer
Mm = molecular weight of the monomer unit
For isotactic polybutene, the monomer unit is butene, with the molecular formula C4H8. The molecular weight of butene is calculated as follows:
Mm = (4 * atomic weight of carbon) + (8 * atomic weight of hydrogen)
Mm = (4 * 12.01 g/mol) + (8 * 1.01 g/mol)
Mm = 56.11 g/mol
Given the molecular weight of isotactic PB (Mw) as 3.091×105 g/mol, we can now solve for n:
n = (3.091×105 g/mol) / (56.11 g/mol)