Effect of hyperbranched poly(citric polyethylene glycol) with various polyethylene glycol chain lengths on starch plasticization and retrogradation

Abstract

A series of hyperbranched poly(citric polyethylene glycol) (PCPEG) materials with varied polyethylene glycol (PEG) chain lengths as plasticizers were mixed with maize starch (MS) via cooking and film‐forming. The structure, pasting property, plasticization, aging property, moisture absorption and compatibility of plasticized starches were studied by means of Fourier transform infrared spectroscopy, X‐ray diffraction, rapid viscosity analysis, tension testing, moisture absorption measurements and scanning electron microscopy. Compared with PEG and citric acid, PCPEG was more effective in promoting starch chain movement and inhibiting the retrogradation of starch film. Also, PCPEG/MS had smaller moisture content. The longer the plasticizer chain, the better were the aging resistance and moisture resistance of starch. But with an increase of PEG chain length, mechanical properties of PCPEG/MS deteriorated and the compatibility between PCPEG and MS decreased. The hyperbranched derivative of PEG with longer chain exhibited improved plasticization and compatibility with starch. © 2019 Society of Chemical Industry

Resorcinol-Formaldehyde (RF) as a Novel Plasticizer for Starch-Based Solid Biopolymer Electrolyte

“…In recent findings, it has been indicated that hyper-branched polymers can serve as a better plasticizing system for starch as they provide flexibility and concurrently inhibit moisture absorption in the films. Zhang et al reported the use of hyperbranched poly(citric polyethylene glycol) as novel plasticizers for maize starch-based films [ 13 ]. In their work, it was demonstrated, that apart from the hydrogen bond-forming ability, such hyperbranced polymer plasticizers impose a physical entanglement of both starch and plasticizer chains and creates steric hindrance, which more effectively inhibits retrogradation.…”