摘要
研究了微波强化碱预处理对二次纤维(SF)化学结构、超分子结构、物理特性的影响,并通过与丙烯腈反应分析微波强化对二次纤维氰乙基化反应性能的影响,初步探讨了微波强化作用机理。结果表明,微波强化碱预处理二次纤维(WASF)的化学组分和晶型没有发生改变,但纤维素分子中的氢键受到部分破坏,结晶度下降,纤维变得疏松,表面和内部结构受到一定的损伤,保水值和可及度增大,反应活性提高。与碱预处理相比,微波强化碱预处理显著提高了二次纤维的氰乙基化反应性能,在同一辐射功率下,延长微波强化时间有利于氰乙基化反应,微波强化碱预处理氰乙基化二次纤维的含氮率由10.85%提高至17.80%。
Microwave-assisted alkali treatment was applied to pretreatment of secondary fiber（SF） to improve its reactivity. The changes of chemical composition, supramoleeular structure and physical characteristics of SF after activation were studied. The mechanism of microwave-assisted alkali pretreatment of secondary fiber（WASF） was discussed. The resuhs showed that crystal form of SF was not changed, but the crystallinity of SF was decreased, hydrogen bonds among SF molecules were partially destroyed, fiber surface was damaged. These changes resulted in the increases of accessibility, specific surface area and reactivity of SF. Under similar microwave irradiation power, prolonging of irradiation time is beneficial to cyanoethylation of SF. Furthermore, nitrogen content of cyanoethylated SF was improved from 10.85 % to 17.80 %.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2010年第1期97-102,共6页
Chemistry and Industry of Forest Products
关键词
二次纤维
碱预处理
微波强化
氰乙基化
secondary fiber
alkali pretreatment
microwave-assisted alkali pretreatment
cyanoethylation
