Graft copolymerization onto native cellulosic fibres using Mn3+ initiation

✍ Scribed by B. Rånby; Harriet Sundström

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 319 KB
• Volume: 19
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(83)90073-3

✦ Synopsis

Graft copolymerization of acrylonitrile (AN) onto never-dried bleached cellulosic fibre substrates from wood has been studied using Mn 3+ ion as initiator complexed with H2P2072 in acid aqueous solution. Experiments at 30' in N 2 for 2 3 hr give high conversion to polymer (70-850/0) and very high grafting efficiency (80-90)0), i.e. only small amounts of homopolymer (10-203/0) are formed. Grease proof pulp fibres are more reactive in grafting than paper pulp fibres. The AN-grafted fibres are hydrolyzed in 1~o aqueous NaOH at 100 which hydrolyzes the nitrile groups to amide and carboxyl groups. The hydrolysis increases the water retntion of the grafted fibres to the 50-65 g water per g fibre. The mechanism of the initiation is discussed, based on experiments with model compounds of low molecular weight.