Here is a list:

https://scientificpolymer.com/technical-library/refractive-index-of-polymers-by-index/

Most of the polymers with lower RI are fluorinated.

Here is a list:

https://scientificpolymer.com/technical-library/refractive-index-of-polymers-by-index/

Most of the polymers with lower RI are fluorinated.

Hi Dr Marcus Binner,

I am using sodium alginate for biomedical application. Thin film of this polymer is transparent. But I am not sure about the refractive index.

Thank you very much!

Please refer

1.Transparent and High-Refractive Index Thermoplastic Polymer Glasses using Evaporative Ligand Exchange of Hybrid Particle Fillers

2. The Mechanical and Optical Properties of Injection-moulded PMMA, Filled with Glass Particles of a Matching Refractive Index

Wolfgang Wildner* and Dietmar Drummer Institute of Polymer Technology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Am Weichselgarten 9, 91058 Erlangen, Germany

Here it is also the list of different materials refraction indexes including some polymers as a function of wavelength https://www.filmetrics.com/refractive-index-database

Thanks again for the very valuable comments, highly recommended!

Hi Marcus,

Just a small addition: if you want to use fluorescent microscopy, some transparent polymers (as the PDMS -polydimethysiloxane-, which is transparent, biocompatible, RI~1.4) are autofluorescent, leading sometimes to imaging issues.

Laetitia