Fe^(2+)-H_2O_2-二氧化硫脲引发桉木浆与甲基丙烯酸缩水甘油酯接枝共聚的研究  

Graft Copolymerization of Glycidyl Methacrylate with Eucalyptus Pulp Induced by Fe^(2+)-H_2O_2-thioureadioxide Redox System

作　　者：黄军[1] 翟华敏[1] 

机构地区：[1]南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京210037

出　　处：《林产化学与工业》2008年第2期58-62,共5页Chemistry and Industry of Forest Products

基　　金：2005江苏省高等学校研究生创新基金(无编号)

摘　　要：研究了Fe2-H2O2-二氧化硫脲体系引发桉木浆与甲基丙烯酸缩水甘油酯(GMA)的接枝共聚。初步讨论了该引发体系的引发机理,用接枝率、接枝效率和单体转化率考察了温度、反应时间、过氧化氢用量、二氧化硫脲用量、单体浓度和液比对接枝的影响。并用红外光谱对接枝纤维产物进行了鉴定。结果表明,组分二氧化硫脲的加入能有效地使接枝共聚得以顺利进行。适当提高温度,增加过氧化氢用量,减小液比,控制合适的二氧化硫脲用量都能提高接枝率和单体转化率,并在较短的时间就能成功接枝。接枝效率几乎不受任何因素的影响,一般维持在97%~99%,接枝过程产生的均聚物极少。Graft copolymerization of bleached eucalyptus pulp with glycidyl methacrylate （GMA） induced by Fe^2＋-H2O2- thioureadioxide redox system was studied in detail. The mechanism of this initiator system was discussed primarily ; the effects of reaction temperature and time, hydrogen peroxide and thioureadioxide dosages, monomer concentration and liquor ratio were characterized by the grafting rate, grafting efficiency and monomer conversion, and the chemical structure of grafted fiber was identified by FI-IR. Results showed that the addition of thioureadioxide can help to produce more radicals, which react with cellulose to obtain cellulose macromolecule radicals and thus proceed the graft copolymerization successfully. Proper increases of temperature, hydrogen peroxide dosage, proper decrease of liquor ratio and proper maintaining of thioureadioxide dosage are beneficial to the grafting rate and monomer conversion. Graft copolymerization can be proceeded successfully in a short time. Grafting efficiency could be generally maintained at 97 % to 99 % , and was almost not affected by any factor. Extremely insignificant amount of homopolymer was produced during the grafting process.

关 键 词：Fe^2+-H2O2-二氧化硫脲 桉木浆 甲基丙烯酸缩水甘油酯 接枝共聚 

分 类 号：TQ35[化学工程] TS74[轻工技术与工程—制浆造纸工程]