Starch‐g‐poly(phenyl acrylate) copolymers—synthesis, characterization, and physicochemical properties

Abstract

Synthesis, characterization, and physicochemical properties of some novel starch‐g‐poly(phenyl acrylate) copolymers are presented. The chemical modification of gelatinized potato starch by grafting with phenyl acrylate using K2S2O8 as a radical initiator and employing different reaction conditions was studied in detail. Depending on the reaction conditions, the grafting parameters were changed, achieving their maximum values (grafting percent G: 41.8%, grafting efficiency GE: 82.3%) at 80°C under a reaction time of 150 min and starch to monomer ratio of 1:2. Spectroscopic methods (FTIR and 13C CP/MAS NMR) confirmed the successful formation of copolymers under the radical reaction of primary and secondary OH groups of starch and carbon–carbon double bonds of phenyl acrylate monomer. Scanning electron microscopy (SEM) indicated a non‐porous, rough, and heterogeneous structure of the copolymers. The blocking of some hydroxyl groups of starch by phenyl acrylate chains allowed more moisture resistant and more acid resistant copolymers to be compared, as compared to unmodified starch. Moreover, the copolymers were insoluble in polar and non‐polar solvents; however, they were able to undergo swelling. The range of swelling was dependent on the grafting parameters as well as the polarity of the solvents. According to DSC analysis, the copolymers exhibited a glass transition temperature of ca. 63–65°C and decomposed under two steps, which were directly connected with the degradation of starch and phenyl acrylate chains.

The preparation, physicochemical and thermal properties of the high moisture, solvent and chemical resistant starch-g-poly(geranyl methacrylate) copolymers

“…The first step of the synthesis of the copolymers included the preparation of the geranyl methacrylate monomer in the esterification process of geraniol and methacryloyl chloride in the presence of triethylamine as a catalyst and its purification according to the method presented in Refs. [36,37]. The structure of monomer was evaluated and described elsewhere [38].…”

“…Such prepared monomer was applied to potassium persulfate initiated copolymerization process with potato starch. The graft process was performed according to the procedure described elsewhere [36,37].…”

Synthesis and Characterization of Sodium Carboxymethyl Starch‐Graft Acrylamide/1‐Vinyl‐2‐Pyrrolidone Copolymers via Central Composite Design and Using as Filtration Loss Agent in Drilling Muds

“…[ 7 ] Filtration loss performance is one of the most important functions. [ 8 ] Filtration loss agent is classified into natural, [ 9 ] modified natural, [ 10 ] and fully synthetic polymers. [ 11 ] As environmental friendly filtration loss agent, starch is widely used in upper shallow drilling.…”

Development of a High-Performance Adhesive with a Microphase, Separation Crosslinking Structure Using Wheat Flour and a Hydroxymethyl Melamine Prepolymer

“…In recent years, many researchers have attempted to modify the starch in order to improve the bond performance and/or water resistance of the resultant adhesive. Such attempts include, but are not limited to oxidized modification [7], enzymatic modification [8,9], esterified modification [10,11,12,13], and grafting modification [14,15]. The adhesives produced from oxidized and enzymatic modification underwent a complicated synthesis process and still depicted a low bond strength and poor water resistance.…”