Synthesis of a Biodegradable Polymer of Poly (Sodium Alginate/Ethyl Acrylate)

Abstract

The objective of the study was to obtain a new biodegradable graft polymer by performing two chemical processes: first, a transesterification reaction between carboxylic acid’s salt and ethyl acrylate’s ester, followed by polymerization of the vinyl group from the ethyl acrylate monomer via free radicals. The copolymer’s FTIR shows an absence of ethyl bands, while the characteristic band of pyranose is maintained, which confirms the monomer’s graft. TGA analysis shows that sodium alginate had three decomposition temperatures: 103 °C due to dehydration, 212 °C associated with the destruction of glycosidic bonds, and 426 °C due to conversion of alginate into Na2CO3. The copolymer presents four processes at different temperatures, i.e., evaporation of alcohol at 65 °C, decomposition of ungrafted alginate at 220 °C, copolymer decomposition at 298 °C, and degradation of fragments into carbonate at 423 °C. The evaluation of the action of fungal growth on the copolymer was higher than 50%, which means it is an excellent material to be biodegraded.

Structural, optical, thermal, and dielectric properties of carboxymethyl cellulose/sodium alginate blend/lithium titanium oxide nanoparticles: Biocomposites for lithium‐ion batteries applications

“…The thermal properties of prepared nanocomposite samples were examined via DSC technique to determine the thermal transitions, 9,21 as showed in Figure 7. The thermogram for pure film showed an exothermic peak (T w ) at near 55.80°C that was assigned to the dehydration of water (T w ) linked by hydrogen bridges 21,30,37 . The DSC curve depicted the prepared CMC/SA blend was miscible through displaying a single endothermic peak at 73.28°C, which was attributed to the glass transition temperature (T g ) resulting from the overlapping T g for the virgin polymers of blend as the T g values for pure CMC and pure SA polymers were 75°C 13,30 and 64°C, 37,38 respectively.…”

“…21,30,37 The DSC curve depicted the prepared CMC/SA blend was miscible through displaying a single endothermic peak at 73.28 C, which was attributed to the glass transition temperature (T g ) resulting from the overlapping T g for the virgin polymers of blend as the T g values for pure CMC and pure SA polymers were 75 C 13,30 and 64 C, 37,38 respectively. The melting point (T m ) and decomposition (T d ) temperatures of pure CMC/SA blend were appeared as an endothermic peak at 266.26 C and 343.33 C. 13,30,37,38 At T d , the polymeric chains of CMC/SA blend suffered from a thermal degradation process, due to the bond cleavage of alginate/ polysaccharide groups of CMC/SA blend, that leaded to the formation of sodium carbonate (Na 2 CO 3 ) and carbonized residues. 22,26,30,37 These four transition temperatures were reported in Table 3.…”

“…The melting point (T m ) and decomposition (T d ) temperatures of pure CMC/SA blend were appeared as an endothermic peak at 266.26 C and 343.33 C. 13,30,37,38 At T d , the polymeric chains of CMC/SA blend suffered from a thermal degradation process, due to the bond cleavage of alginate/ polysaccharide groups of CMC/SA blend, that leaded to the formation of sodium carbonate (Na 2 CO 3 ) and carbonized residues. 22,26,30,37 These four transition temperatures were reported in Table 3. From this table, the increase of T g value for the filled samples depicted that the polymeric chains become more rigid, and the mean molecular weight of CMC/SA structure was increased in the amorphous regions.…”

Coacervate Microcapsules of Citrus aurantifolia Essential Oil (LOs): Optimization and Their Antibacterial Activity Study

“…Based on the presented thermograph, the LOs microcapsules of A/G (1 : 3.75) were considered to have high thermal stability which might be due to firmed solidification by a crosslinker, thus lowering the decarboxylation process [11,20] . As the sodium alginate started to decompose at 423 ο C into sodium carbonate, [47] the remaining mass found up to 700 ο C, was plausibly the inorganic salt [48] . Resistance of the microcapsules against thermal secured the protective properties of the shells towards the LOs inside the core.…”

Photo-induced Synthesis, Characterization and Alkaline hydrolysis of Sodium salt of Partially Carboxymethylated Sodium Alginate–g–Poly(acrylonitrile)

“…The biodegradability of SA can be improved through grafting with vinyl monomers. [8][9][10][11][12][13][14][15][16][17][18] Literature survey reveals that the reports on the modification of Na-PCMSA through photo-grating are scanty. 19 In the present investigation, SA was first modified with carboxymethylation followed by photo-grafting of AN on to Na-PCMSA ( = 1.10) using CAN as a photo initiator.…”