Photografting of methacrylic acid on low-density polyethylene film in presence of polyfunctional monomers

✍ Scribed by Hitoshi Kubota; Munenaka Koyama

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 165 KB
• Volume: 63
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19970321)63:12<1635::aid-app14>3.0.co;2-z

✦ Synopsis

Photografting ( l ú 300 nm) of methacrylic acid (MAA) on low-density polyethylene (PE) film (thickness Å 30 and 60 mm), on which xanthone photoinitiator was coated earlier, was investigated at 60ЊC in the presence of polyfunctional monomers such as N,N-methylenebisacrylamide (MBAAm) and trimethylol propane triacrylate (TMPTA). Addition of the polyfunctional monomers (0.01 and 0.1 wt %) to the grafting system largely accelerated the photografting, and the magnitude of the enhancement was larger for TMPTA than MBAAm. MBAAm component was incorporated into PE substrate and/or MAA-grafted chains through the grafting reaction. Double bonds of the introduced polyfunctional component seemed to act as a new site for the grafting initiation, leading to the promoted grafting. The polyfunctional monomer did not affect distribution of the grafted chains in the cross section of the resultant MAA-grafted film, which was measured by electron probe microanalysis. Wettability of the MAAgrafted PE film was not influenced by the addition of MBAAm, but water absorbency was reduced by using a higher concentration of MBAAm.