You should be able to answer these questions without too much difficulty after studying this TLP. If not, then you should go through it again!
Below are pictures of 3 polymers, one each of atactic, syndiotactic and isotactic. Which option has the correct sequence?
Which of the following polymers would be likely to have the highest crystallinity:
The following questions require some thought and reaching the answer may require you to think beyond the contents of this TLP.
Kuhn length calculations
a) A polyethylene chain is formed from 3000 ethene monomers. Given that the length of a single carbon-carbon bond is 0.154 nm, calculate the expected end-to-end distance using the random walk model, assuming that each bond is freely jointed.
b) Given that the Kuhn length of polyethylene is equal to 3.5 C-C bond lengths, calculate an improved estimate of the expected end-to-end distance of the polymer chain.
A polymer sample was found to have the following molecular weight distribution:Number of moleculesMolecular weight / g/mol2005,00030010,00040020,00010040,000
Calculate the number average and weight average molecular weights, and the polydispersity index.