【摘要】：纖維素作為一種綠色環(huán)保的可再生資源,無毒無害、來源豐富、可生物降解、廉價、生物相容性好。但因為分子內(nèi)和分子間的氫鍵作用,纖維素的分解溫度低于熔融溫度,不能實現(xiàn)熔融加工,且不溶于常用有機溶劑。本論文首先以微晶纖維素為原料,在1-烯丙基-3-甲基咪唑氯鹽([Amim]Cl)離子液體或1-乙基-3-甲基咪唑醋酸鹽([Emim]Ac)/N,N-二甲基乙酰胺(DMAc)體系中溶解纖維素并接枝苯甲酰氯(BC),運用了傅里葉變換紅外(FTIR)、核磁共振氫譜(1H-NMR)、差示掃描量熱法(DSC)、熱重分析(TG)、熱臺顯微鏡(POM)以及溶解性等測試儀器和表征方法,探究了在一定反應(yīng)時間內(nèi)不同含量的BC、不同反應(yīng)溫度下制備的纖維素苯甲酸酯(CB)的性能。以CB為反應(yīng)單體,以二乙二醇正十六烷基醚(E2C16)為功能物質(zhì)制備纖維素苯甲酸酯-g-二乙二醇正十六烷基醚(CB-g-E2C16)固-固相變材料。探究了不同反應(yīng)溫度(70℃-110℃)、不同投料比(E2C16:AGU=2:1-8:1 mol%)等反應(yīng)參數(shù)對產(chǎn)物結(jié)構(gòu)與性能的影響。當CB(DS=0.12)的取代度較低時,CB不具有熱塑性,隨著取代度增加,CB開始出現(xiàn)玻璃化轉(zhuǎn)變溫度(143.2℃-182.1℃);并且DS越大,玻璃化轉(zhuǎn)變溫度越低。相比較于微晶纖維素,取代度較低的CB(DS=0.13-1.05)的熱穩(wěn)定性有所下降,取代度較高(DS=2.80)時,CB的熱力學穩(wěn)定性比纖維素高。所制備的CB(DS=0.13-2.98)均能溶解于DMSO和DMF等極性溶劑,具有較高取代度的CB(DS=2.80-2.98)可溶解于DMSO和DMF等極性溶劑的同時也能溶解于丙酮;在熱臺顯微鏡下,取代度達到一定值的CB(DS=1.05)具有熔融的跡象。DS為0.68-1.24的CB-g-E2C16固-固相變材料具有7 J/g-24 J/g的相變焓,熱穩(wěn)定性優(yōu)良,起始分解溫度為280℃-300℃,峰值分解溫度為320℃-340℃,且均能溶解于DMSO和DMF等極性溶劑。在熱臺顯微鏡下,70℃-110℃的反應(yīng)溫度下制備的CB-g-E2C16共聚物在30℃-250℃沒有熔融,表現(xiàn)為固-固相變。
[Abstract]:As a kind of green renewable resource, cellulose is non-toxic and harmless, rich in sources, biodegradable, cheap, and has good biocompatibility. However, due to the intermolecular and intramolecular hydrogen bonding, the decomposition temperature of cellulose is lower than the melting temperature, which can not realize melting processing and is insoluble in common organic solvents. In this paper, microcrystalline cellulose was used as raw material. The Fourier transform infrared (FT-IR) (FTIR), spectroscopy was used to dissolve cellulose and graft benzoyl chloride (BC), into 1-allyl-3-methylimidazolium chloride ([Amim] Cl) ionic liquid or 1-ethyl-3-methylimidazolium acetate ([Emim] Ac) / (DMAc) system. (1H-NMR), differential scanning calorimetry (DSC), thermogravimetric analysis, (TG), thermogravimetric analysis, (POM), solubility and other testing instruments and characterization methods, The properties of cellulose benzoate (CB) prepared at different reaction temperature with different content of BC, in a certain reaction time were investigated. Cellulose benzoate -g- diethylene glycol cetyl ether (CB-g-E2C16) was prepared by using CB as reaction monomer and diethylene glycol cetyl ether (E2C16) as functional substance. The effects of different reaction temperature (70 鈩，

本文編號：2217852