Polymer molecular weight and refractive index is related. Then why refractive index is reported without mentioning molecular weight?

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Yuri Mirgorod

The refractive index depends on the molecular weight of the polymer at its small values. See the link. For large values this difference disappears as in all additive parameters, for example, density.

http://onlinelibrary.wiley.com/doi/10.1002/pol.1965.100030728/pdf

Hitesh Sharma

@ Yuri Mirgorod: Thank you sir for your reply and for providing the reference.

Regards