本文的主要工作是合成纤维素接枝聚甲基丙烯酸甲酯(PMMA)的共聚物(Cell-g-PMMA)，以实现材料的结构和性能可调。实验首先合成纤维素的良溶剂1-丙烯基-3-甲基咪唑氯盐(AMIMCl)离子液体；其次，利用纤维素与2-溴异丁酰溴的酰化反应，将“活性种”(BiB)接入到纤维素骨架上，合成大分子引发剂(Cell-BiB)；最后，通过原子转移自由基聚合(ATRP)将柔性支链PMMA接枝到纤维素骨架上，制备共聚物Cell-g-PMMA。FT-IR、1H-NMR、DSC、XRD以及TEM等测试结果表明Cell-BiB的结构中含有ATRP 聚合所需的“活性种”，可以用于制备Cell-g-PMMA。共聚物中支链PMMA的引入，降低了材料的玻璃化转变温度与结晶度，MMA与引发剂的浓度比越高、反应时间越长，材料的玻璃化转变温度越低。实验表明，改变反应条件，可以从微观水平上改变材料的结构，从而实现对聚合物的玻璃化转变温度性能的控制。78118

毕业论文关键词：纤维素；聚甲基丙烯酸甲酯；接枝改性；原子转移自由基聚合

毕业设计说明书外文摘要

Title  Preparation and Characterization of Cellulose - based Graft Copolymer

Abstract The purpose of this article is to synthesize a graft copolymer Cell-g-PMMA, with soft poly (methyl methacrylate) (PMMA) branches and rigidity cellulose bone, and acheive the structure and properties of the material can be adjustable。 First, we synthesized an ionic liquid 1-allyl-3-methylimidazolium chloride (AMIMCl), a good solvent for cellulose。 Next, Second, macroinitiator(Cell-BiB) was synthesized by homogeneous acylation of cellulose with 2-bromoisobutyryl bromide, in order to graft “active species" ( BiB) on the celluse。 Last, by atom transfer radical polymerization (ATRP),  Cell-g-PMMA with soft PMMA branches and rigidity cellulose bone was synthesized。 The polymer was successfully characterized by FT-IR、1H-NMR、DSC、XRD and TEM。 The results show that Cell-BiB include BiB and can be prepare the Cell-g-PMMA, which is required by ATRP。 The glass transition temperature and the crystallinity of the material decreases due yo the introduction of the soft PMMA branches, and the ratio of monomer and macroinitiator and reacting time is beneficial to the decrease。 The results indicate that the microstructure of the marerial can be changed and  the glass transition temperature can be controlled by changing reacting conditions。 

Keywords: cellulose; poly( methyl methacry-late); graft modification; ATRP

目    次

1  绪论 1

1。1  纤维素概述 1

1。2  纤维素接枝共聚物 1

1。3  研究目的与意义 2

2  1-丙烯基-3-甲基咪唑氯盐(AMIMCl)离子液体的合成 3

2。1  引言 3

2。2  实验部分 4

2。2。1  原料与试剂 4

2。2。2  仪器用品 4

2。2。3  合成AMIMCl离子液体 4

2。3  结果与讨论 4

2。4  本章小结 4

3  纤维素大分子引发剂Cell-BiB的合成与表征 5

3。1  引言 5

3。2  实验部分 6

3。2。1  原料与试剂 6

3。2。2  仪器与表征