Here are some alternative polymers of Chitosan to prepare an Expandable film loaded with solid dispersions(SD):

• Poly(lactic-co-glycolic acid) (PLGA): PLGA is a biocompatible and biodegradable polymer that is often used in medical applications. It is also a good film-forming polymer, and it has been shown to be effective in delivering SDs.
• Poly(ethylene oxide) (PEO): PEO is a hydrophilic polymer that is also a good film-forming polymer. It has been shown to be effective in delivering SDs, and it is also relatively non-toxic.
• Poly(vinyl alcohol) (PVA): PVA is a water-soluble polymer that is also a good film-forming polymer. It has been shown to be effective in delivering SDs, and it is also relatively inexpensive.
• Poly(methacrylic acid) (PMMA): PMMA is a hydrophobic polymer that is also a good film-forming polymer. It has been shown to be effective in delivering SDs, but it is not as biocompatible as some of the other polymers listed here.
• Poly(hydroxyethyl methacrylate) (PHEMA): PHEMA is a hydrophilic polymer that is also a good film-forming polymer. It has been shown to be effective in delivering SDs, and it is also relatively non-toxic.

The best alternative polymer for a particular application will depend on the specific properties of the SD being delivered, as well as the desired properties of the film.

Hope this will help you, thanks and regard

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PVA, PEG, PMMA, Agarose, PDMS, Sodium alginate