Synthesis of biodegradable thermoplastic copolymers based on starch by atom transfer radical polymerization (ATRP): Monolayer chain growth on starch

Abstract

Modification of starch is increasingly being studied and starch is used for applications in which synthetic polymers have traditionally been the materials of choice. In this work the surface of starch was successfully modified by the polymerization of polystyrene and polyacrylamide by atom transfer radical polymerization (ATRP) method in dispersion medium. For this propose the bromoactylated starch was prepared by the reaction between hydroxyl groups of starch and the bromoacetyl bromide in DMA/LiCl (5%) in the presence of pyridine. The bromoactylated starch acts as macroinitiator in ATRP of styrene. The polymer chains' growth on surface of starch was clearly showed by the AFM images. Other analyses were used in this work such as FT‐IR, DSC, and TGA.

An Investigation of the Effect of Semi-Acetal Formation on the Properties of Dialdehyde Starch and its Thermoplastic Blend with Glycerol

“…[1][2][3][4][5][6] Due to the consideration of environment protection and replacement of petroleum based materials, the utilization of starch as biodegradable plastics began in the 1970s, and has drawn much attention recently. [7][8][9][10] However, the use of thermoplastic starch (TPS) as a substitute of conventional petroleum-based plastics has been limited by its brittleness and hydrophilicity. Yu's group investigated polyols and acylamide as plasticizers of starch.…”

Synthesis of a cellulose‐based hydrogel network: Characterization and study of urea fertilizer slow release

“…During grinding, BAB was added dropwise to the mortar while the mortar was kept in ice bath to control the heat of the reaction. The advantages of this method, compared to solvent dispersion method, are solvent nonuse and it needs a shorter reaction time . In the next step, urea was used as crosslinking agent to synthesize the CBA‐cell hydrogel.…”

Modification of starch by graft copolymerization

“…The active radical can react either with the monomer and propagate or either with the metal halide complex to form a dormant alkyl halide species, this process being reversible. Butyl acrylate (GP = 10–21%) , styrene, acrylamide , and methyl methacrylate were polymerized on granular starch surface using starch bromo‐acetic ester as the macroinitiator and Cu(I)Br associated to 1,10‐phenantroline or N , N , N ′, N″ , N″‐ pentamethyldiethylenetriamine in DMA/LiCl. The main advantage of this approach is the absence of homopolymer formation, due to the living character of ATRP.…”