Synthesis of poly(ethylene-co-vinyl alcohol)-g-polystyrene graft copolymer and their applications for ordered porous film and compatibilizer

Abstract

A series of new functional poly(ethylene-co-vinyl alcohol)-g-polystyrene graft copolymers (EVAL-g-PS) with controlled molecular weight (M n 5 38,000-94,000 g mol 21) and molecular weight distribution (M w /M n 5 2.31-3.49) were synthesized via a grafting from methodology. The molecular structure and component of EVAL-g-PS graft copolymers were confirmed by the analysis of their 1 H NMR spectra and GPC curves. The porous films of such copolymers were fabricated via a static breath-figure (BF) process. The influencing factors on the morphology of such porous films, such as solvent, temperature, polymer concentration, and molecular weight of polymer were investigated. Ordered porous film and better regularity was fabricated through a static BF process using EVAL-g-PS solution in CHCl 3 . Scanning electron microscopy observation reveals that the EVAL-g-PS graft copolymer is an efficient compatibilizer for the blend system of low-density polyethylene/polystyrene. V C 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016, 54, 516-524

Poly(δ-valerolactone)/Poly(ethylene-co-vinylalcohol)/β-Tricalcium Phosphate Composite as Scaffolds: Preparation, Properties, and In Vitro Amoxicillin Release

“…Poly(ethylene vinyl alcohol) (PEVAL) is a synthetic random copolymer of semi-crystalline structure over the entire range of composition [ 23 ]. This copolymer is synthesized by various processes, the most important of which is ethylene’s copolymerization with vinyl acetate, which produces poly(ethylene-co-vinylacetate) followed by hydrolysis of the vinyl alcohol units [ 24 ]. Being one of the most popular and flexible materials, PEVAL is largely investigated to be used in the biomedical field, notably as a carrier in the drug delivery field because of good blood compatibility [ 25 ], high gas-barrier [ 26 ], biocompatibility [ 25 ], harmlessness toward health [ 27 ], non-toxicity [ 28 ], hydrophilicity, availability of ethylene units to control its ability to swell and hence control the rate of its delivery [ 29 ], and has safe ethylene units liable to degradation and can undergo complete biodegradation, notably in the presence of enzymes [ 28 , 30 ].…”

One‐step synthesis of polysiloxane graft polyethylene mimic: Non‐expensive compatibilizer for polyethylene/polysiloxane blend

“…Aiming to getting most out of polyolefin, researchers from both academia and industry have been working on seeking efficient ways to further enhance the properties of polyolefin ever since the invention of polyolefin . Polyolefin‐segmented graft or block copolymers, containing both crystalline polyolefin segments and other functional polymer segments, have attracted considerable attention during the past few decades as they promise high‐performance polyolefin‐based materials …”

Formation of Hierarchical Porous Structure via Breath Figure Method

“…Eventually, after complete evaporation of the solvent and water droplets, hexagon-arranged honeycomb pores templating from water droplets are left on the polymer film surface. The surface morphologies of the porous films mainly depend on the polymer structure, humidity, concentration of solution, solvent, and the temperature of the solution surface [16][17][18]. A wide variety of polymers are devoted to obtain honeycomb structures.…”