Facile synthesis of oligo(4‐methoxyphenol) in water and evaluation of its efficiency in stabilization of polypropylene

Abstract

A hindered polyphenol, oligo(4-methoxyphenol), has been first successfully synthesized via a mild biocatalytic pathway using horseradish peroxidase as catalyst in water without any additive.Then the efficiency of oligo(4-methoxyphenol) in stabilization of polypropylene (PP) was evaluated in terms of thermal analysis and accelerated aging test. It was observed that the apparent activation energy for thermal decomposition of PP/oligo(4-methoxyphenol) calculated by Friedman's method is higher than that of virgin PP. Oligo(4-methoxyphenol)-stabilized PP maintains its tensile strength even after aging at 120°C for 800 hours. Oxidation induction time and onset oxidation temperature of PP/oligo(4-methoxyphenol) are higher than both virgin PP and PP/4-methoxyphenol, as well as PP stabilized with commercially available 6-di-tert-buty-4-methylphenol or 1076. These results indicate that oligo(4-methoxyphenol) can effectively improve the thermo-oxidative resistance of PP. Noting that oligo(4-methoxyphenol) is synthesized via enzymatic polymerization in water under mild condition with a facile procedure, oligo(4-methoxyphenol) is thus proposed as a new efficiency and readily available antioxidant for PP.

A Kinetic Evaluation for PANSA Doped Low Density Polyethylene Blends

“…The solid state decomposition kinetics of PANSA doped LDPE blends were investigated by TG-DTG-DTA thermograms. The each of curves were recorded for different heating rates (5,10,15, and 20 ºC min -1 ) (Figure 1). The TG-DTG and DTA curves of all AP n blends showed that degradation occurs mainly in one step.…”

“…Oligo (4methoxyphenol) is a steric hindered and phenolic compound having high molecular mass. [5]. This compound was also found to be an effective antioxidant in polyethylene stabilization.…”

ROMP of novel hindered phenol-functionalized norbornenes and preliminary evaluation as stabilizing agents†

“…Spectra were obtained at regular time intervals in the MIR region of 40 0 0-50 0 cm -1 at a resolution of 4 cm -1 (640 scans) and analyzed using OMNIC Spectra software. Onset oxidation temperature (OOT) was measured by differential scanning calorimetry (DSC) on a TA Instruments Q100 according to already reported procedures [32][33][34] . A sample of 2.5 mg was placed in an aluminum pan.…”