Comb-like ionomeric copolymer: Itaconic anhydride-co-stearyl methacrylate

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Shurui Shang, shurui.shang@uconn.edu1, Samuel J. Huang, shuang@mail.ims.uconn.edu2, and Robert A. Weiss, rweiss@mail.ims.uconn.edu2. (1) Department of Chemical, Materials & Biomolecular Engineering, University of Connecticut, 191 Auditorium Road, Unit 3222, Storrs, CT 06269-3222, (2) Institute of Materials Science, University of Connecticut, 97 North Eagleville Road, Storrs, CT 06269
We prepared comb-like copolymers from itaconic anhydride (ITA) and poly(lactic acid) macromonomer, both of which can be obtained from renewable resources. We have now studied the copolymers of ITA and stearyl methacrylate (SM) having similar comb-like structures and their ionomers. ITA/SM copolymers were obtained from bulk free radical copolymerization. WAXD and DSC results confirmed the expected partial crystalline morphology. Conversion of the copolymers into ionomers was performed by neutralizing the ITA moiety with different salts of Na, Zn and Ca etc. FTIR and SAXS analyses indicated the ionic associations in the copolymer. The cation type and concentration effects on the morphology and thermal mechanical properties of the copolymers were discussed in details.