Synthesis and characterization of biocopolymer kappa-Carrageenan(k-C)-g-Polyacrylamide/Activated Bentonite composite

Öz

In the last decade, there is and increased interest to use biodegradable materials. In the present study, new composites based on activated bentonite (BNA)/ kappa-Carrageenan (k-C)/acrylamide (AM) have been prepared by graft copolymerization of acrylamide (AM) and kappa-Carrageenan (k-C) in the presence of activated bentonite (BNA) clay powder, and ammonium persulfate (APS) as initiator. Different component concentrations of acrylamide (AM) and kappa-Carrageenan (k-C) were used by maintaining 1 g of activated bentonite (BNA) in all types of composites. We focused on the interactions between mineral clay structure and polymer matrices. The structure and morphology of these materials were investigated by FT-IR and XRD, while the thermal properties were tested using TGA. Evidence of grafting and BNA interaction was obtained by comparison of FTIR and TGA spectra of the initial substrates and the composites. The apparition of new absorption bands in the composites spectra confirmed BNA- (k-C/AM) linkages. Electrostatic interactions and/or hydrogen bonds may have occurred between BNA and (k-C/AM) copolymer. TGA analysis showed the thermal stability improved by adding BNA clay particles. The formation of intercalated nanocomposites in the case of C1 ((BNA/k-C/AM) (1/0.5/0.5)), C2 ((BNA/k-C/AM) (1/1/0.5) ) and C3 ((BNA/k-C/AM) (1/0.5/1)) samples was confirmed by the shift of the principal peak of montmorillonite present in BNA to lower angles, while for C4(BNA/k-C/AM) (1/1/1), formation of exfolied nanocomposite was evident.

Anahtar Kelimeler

• Activated bentonite
• Carrageenan
• Acrylamide
• Composite

Kaynakça

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