Polystyrene pellets commercially available have an average molecular and it cannot be used directly. My concern is to find a way to first convert these pellets into liquid form and then using the same as a dispersing solution.
Most commercial polymers are poly-disperse (i.e. they have an average molar mass). An academic researcher can buy some mono-disperse polymers but their cost is high because of the tedious effort that was done in their preparation.
When I was MSc student, many years ago, there was training on fractionation of polymers (segmentation of macro molecules according to their size on the basis of differences in solubility behavior) .
In short, a polymer solution is made first. Then there is gradual addition of a non-solvent "precipitant". The first solid fraction, which forms,is collected & dried (this will have the highest molar mass). Then another amount of non-solvent is added, another solid fraction precipitates, so it is collected & dried (the molar mass will be less)... and so on.
You can collect ,e.g. 5 fractions or 10 fractions "better". If you examine a given fraction, you will see some homogeneity in molar mass (say around a figure of 12,000 or 25,000 ...etc.). Such a polymer will be very appropriate for your research, later on.
To start with, please see these slides :
https://www.slideshare.net/ShoshiPrasad/fractionation-of-polymer
and please see this question that was raised by a Research Gate colleague 4 years ago:
https://www.researchgate.net/post/Does_anyone_know_about_fractional_precipitation
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