✦ LIBER ✦

Effects of film thickness and inhibitor concentration on the sorption and thermal polymerization of acrylic acid in low-density polyethylene

✍ Scribed by Maria José Araújo Sales; Glaucione Gomes De Barros

Publisher: John Wiley and Sons
Year: 1993
Tongue: English
Weight: 325 KB
Volume: 47
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1993.070470810

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✦ Synopsis

We investigated the effects of hydroquinone monomethyl ether concentration and film thickness upon the thermal polymerization of acrylic acid on low-density polyethylene. The thermal polymerization of acrylic acid on low-density polyethylene depended on the concentration of hydroquinone monomethyl ether inhibitor. It was a free-radical reaction with initiation on the film surface and then proceeding to the bulk matrix. The process was not controlled by monomer diffusion for the range of film thickness of 90-200 pm. It became a diffusion-controlled process at higher film thicknesses (> 200 pm) . A film layer of up to 100 pm was proposed as the limiting thickness for a diffusion-free process.

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## Abstract Low‐and high‐density polyethylenes were irradiated by electron beams with dose of 2–50 Mrad and then immersed in aqueous solution of acrylic acid (monomer concentration from 30 to 100 wt %) for 10 min−5 h at a temperature of 25–40°C. The degree of grafting increases with time and levels