Graphene oxide as a multi-functional additive for compatilizer, enhancer, and barrier in ethylene vinyl alcohol copolymer/aramid pulp composites

Abstract

To improve the thermal, mechanical, and barrier properties of ethylene vinyl alcohol copolymer (EVOH)/aramid pulp (AP), graphene oxide (GO) was used as a compatilizer, enhancer, and barrier to fabricate EVOH-based composites.

Copolymers of Vinyl Acetate and Vinyl Carboxylates Bearing Branched C7–C9 Chains: Synthesis, Alcoholysis, and Properties

“…15 Alcoholysis degree is a crucial parameter that affects the properties of EVOH. 23 The content of VAc units in EVA is hardly greater than 40 mol %, and thus the fraction of hydroxyl groups in EVOH is also limited. 24 Furthermore, the copolymerization of VAc and ethylene is commonly carried out at an extremely high temperature and pressure due to the unstable conjugations in ethylene.…”

“…Another important commercial copolymer containing vinyl alcohol units is ethylene-vinyl alcohol copolymer (EVOH). − EVOH is a semicrystalline polymer widely used in food, cosmetics, and pharmaceutical packaging for its excellent oxygen barrier property, easy processability, nontoxicity, flexibility, and thermal stability. − In recent years, there has been a resurgence of interest in EVOH because of its emerging applications such as protein separation, drug release, and battery separation. − The production of EVOH consists of two steps, including the synthesis of the vinyl acetate-ethylene copolymer (EVA) by radical copolymerization and the subsequent alcoholysis in toluene at high temperature . Alcoholysis degree is a crucial parameter that affects the properties of EVOH . The content of VAc units in EVA is hardly greater than 40 mol %, and thus the fraction of hydroxyl groups in EVOH is also limited .…”

Hydroxyapatite nanoparticles decorated with metal–organic framework, Co‐Cu/ZIF@HAp, and evaluation of photocatalytic performance of the prepared nanocomposite in the degradation of organic pollutants

“…It has the molecular formula Ca 10 (PO 4 ) 6 (OH) 2 . Besides their application in photocatalytic degradation and wastewater treatment, HAp-based materials have wide range utilities in various fields, which include drug delivery system 13,14 tissue engineering, 15 heavy metal adsorption, 16 and antibacterial material 17,18 and act as catalyst in organic reaction transformation 19,20 and so on. HAp can be easily prepared by using different methods such as chemical, coprecipitation, hydrothermal, sol-gel method, etc.…”