115. Preparation and morphology of different types of cellulose spherulites from concentrated cellulose ionic liquid solutions
writer：Hongzan Song, Yanhua Niu, Jian Yu, Jun Zhang, Zhigang Wang and Jiasong He
keywords：纖維素，離子液體，球晶，界面誘導(dǎo)
source：期刊
specific source：Soft Matter, 2013, 9, 3013-3020
Issue time：2013年
10-Dec-2012
Dear Prof. Wang,
It is a pleasure to accept your manuscript entitled "Preparation and morphology of different types of cellulose spherulites from concentrated cellulose ionic liquid solutions" in its current form for publication in Soft Matter.
Your manuscript will now be passed for editing and proofs for correction will be sent to you by e-mail in due course.
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Four different types of spherulites of microcrystalline cellulose were prepared using vapor precipitation with proper humidity at various temperatures from concentrated microcrystalline cellulose/1-allyl-3-methylimidazolium chloride solutions.
本文通過(guò)蒸汽沉淀法在纖維素/離子液體濃溶液中成功制備出了纖維素球晶，并通過(guò)偏光顯微鏡、掃描電鏡和X射線衍射對(duì)球晶形貌和結(jié)構(gòu)進(jìn)行了深入研究。偏光顯微鏡結(jié)果表明，在不同濃度和溫度下，可以生成四種不同的球晶：環(huán)帶正球晶、環(huán)帶負(fù)球晶、非環(huán)帶正球晶和非環(huán)帶負(fù)球晶。環(huán)帶球晶的環(huán)間距和球晶尺寸隨著結(jié)晶溫度的升高而增加，同時(shí)所有球晶的大小都隨溶液濃度的的增加而增加，表明濃度影響著纖維素分子鏈的重排從而決定了球晶正負(fù)，而溫度影響了片晶的扭曲從而決定了環(huán)帶球晶的生成。掃描電鏡結(jié)果表明正負(fù)環(huán)帶球晶是由于球晶生長(zhǎng)過(guò)程中片晶扭曲的方向不同而造成的，而非環(huán)帶球晶則成明顯的捆束狀結(jié)構(gòu)。X射線衍射結(jié)果表明，所得四種纖維素球晶均為纖維素II晶型，且衍射強(qiáng)度比快速沉淀法制備的再生纖維素大大增強(qiáng)，特征衍射峰也變得更加尖銳。