Puerarin, an efficient natural stabilizer for both polyethylene and polypropylene

Abstract

Puerarin, a natural compound, was used as multifunctional protector for polyethylene (PE) and polypropylene (PP). Firstly, puerarin and tetrakis(2,4‐di‐tert‐butylphenol)[1,1‐biphenyl]‐4,4′‐diylbisphosphite (PEPQ) could protect PE and PP against thermos‐oxidative degradation: after modification, the oxidation induction time (OIT) of increased ca. 4,160% (PE‐P1200‐P sample) and 130% (PP‐P1200‐P sample); the carbonyl index (CI) obtained through accelerated aging decreased ca. 58% (PE‐P1200‐P sample). Secondly, it is excited to find that puerarin and PEPQ could pretect PE agianst photooxidative degradation: CI value decreased ca. 35% after modification. Thridly, the coorperation of puerarin and PEPQ was also benefit for the processing stability: the change of melt flow rate (MFR) between first and fifth extrusions decreased ca. 83% (PE‐P1200‐P sample) and 99% (PP‐P1200‐P sample). Forthly, puerarin and PEPQ could still protect PE against degradation after five extrusions: the loss of tensile strength and elongation at break decreased ca. 96% and 95% after modification. Finally, the interaction of puerarin with PEPQ was discussed and the role of puerarin in protecting polyolefins was proposed.

Effect of BN or B4C content on physical and tribological properties of copper‐clad laminates reinforced with carbon fiber and epoxy resin

“…2 Then, various fillers and reinforcements, such as graphene oxide, mesophase pitchbased carbon fiber, and carbon nanotubes, were explored to enhance the mechanical, thermal, and electrical properties of copper-clad laminates. 3 In parallel, studies focused on the development of flame-retardant formulations and conductive properties of copper-clad laminates. Flame retardant coatings based on phosphorus/boron-containing epoxy were developed, showcasing improved flame retardancy.…”

The influence of Scutellaria baicalensis extract obtained from traditional Chinese herbal medicine on the thermo‐oxidative degradation and stabilization of plasticized polylactic acid

“…29 Moreover, mango seed wax, an agro-industrial waste from the mango fruit processing industry has been used as an antioxidant plasticizer for PLA packaging applications, which increases the oxidation induction time of the PLA by 23%. 30 In our previous works, bamboo leaves, 31 punica granatum peel, 32 green tea waste, 33 pine needle, 34 puerarin, 35 and forsythia suspense 36 were used as natural antioxidants, which effectively improved the thermal oxidation stability of polyethylene and polypropylene. Among them, puerarin, and forsythia suspense are common traditional Chinese herbal medicines and are a potential source of antioxidants.…”

Influence of scutellaria baicalensis extract on the thermo‐oxidative and composting stability of poly(butylene adipate‐co‐terephthalate)

“…36 In addition, it is reported that the biological nanocomposites of cumin essential oil/PBAT/organic clay were prepared by solvent casting approach, which exhibited improved UV barrier performance, antibacterial and antioxidant activity. 37 In our previous works, some natural substances have shown strong antioxidant activity, such as bamboo leaves, 38 punica granatum peel, 39 pine needle, 40 puerarin, 41 forsythia suspense, 42 and scutellaria baicalensis. 43 The extracts of these substances have been used to modify polyethylene, polypropylene, and polylactic acid, all of which have obtained polymer composites with excellent thermal oxygen stability.…”

“…In our previous works, some natural substances have shown strong antioxidant activity, such as bamboo leaves, 38 punica granatum peel, 39 pine needle, 40 puerarin, 41 forsythia suspense, 42 and scutellaria baicalensis 43 . The extracts of these substances have been used to modify polyethylene, polypropylene, and polylactic acid, all of which have obtained polymer composites with excellent thermal oxygen stability.…”