Nano cellulose particles covered with block copolymer of cellulose and methyl methacrylate produced by solid mechano chemical polymerization
Nano cellulose particles covered with block copolymer of cellulose and methyl methacrylate produced by solid mechano chemical polymerization
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DOI：
10.1016/j.polymdegradstab.2011.12.022
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发表时间：
2012-03-01
影响因子：
5.9
通讯作者：
Enomoto-Rogers, Y.
中科院分区：
文献类型：
--
作者：
Sakaguchi, M.;Ohura, T.;Enomoto-Rogers, Y.
采用固相机械力化学聚合法制备了微晶纤维素-聚甲基丙烯酸甲酯嵌段共聚物（MCC-block-PMMA）包覆的纳米纤维素粒子。甲基丙烯酸甲酯的聚合是由链端型微晶纤维素（MCC）自由基（即，MCC机械自由基），其由β-1，4糖苷键的机械断裂诱导。采用索氏抽提法对MCC-block-PMMA化学改性后的纤维素颗粒进行分级，得到MCC-block-PMMA残渣和MCC-block-PMMA滤液。MCC-嵌段-PMMA残留物中用MCC-嵌段-PMMA化学修饰的MCC颗粒表面部分覆盖有MCC-嵌段-PMMA的PMMA链。相比之下，在MCC-嵌段-PMMA滤液中用MCC-嵌段-PMMA化学改性的MCC纳米颗粒的表面被MCC-嵌段-PMMA的PMMA链完全覆盖。化学完全改性的MCC纳米颗粒在氯仿中的分散体是光学透明的。在氯仿中的化学完全改性的MCC纳米颗粒的平均直径估计为52 nm。这些都证实了电子自旋共振，傅里叶变换红外，和H-1核磁共振光谱，凝胶渗透色谱和动态光散射。(C)2011爱思唯尔有限公司保留所有权利。
Nano cellulose particles covered with a block copolymer of microcrystalline cellulose and poly(methyl methacrylate) (MCC-block-PMMA) were produced by a solid mechano-chemical polymerization. The polymerization of methyl methacrylate was initiated by chain-end-type microcrystalline cellulose (MCC) radicals (i.e.. MCC mechano radicals) on the surface of MCC that were induced by mechanical fracture of beta-1,4 glycosidic linkages. The chemically modified cellulose particles with MCC-block-PMMA were fractionated by Soxhlet extraction with chloroform, and resulted in MCC-block-PMMA residue from residue on the filter and MCC-block-PMMA filtrate from filtrate solution. The surface of the MCC particles chemically modified with MCC-block-PMMA in MCC-block-PMMA residue was partially covered with PMMA chains of the MCC-block-PMMA. In contrast, the surfaces of the MCC nanoparticles chemically modified with MCC-block-PMMA in MCC-block-PMMA filtrate were fully covered with PMMA chains of the MCC-block-PMMA. A dispersion of the chemically fully modified MCC nanoparticles in chloroform was optically transparent. The average diameter of the chemically fully modified MCC nanoparticles in chloroform was estimated to be 52 nm. These were confirmed by electron spin resonance, Fourier transform infrared, and H-1 nuclear magnetic resonance spectroscopy, by gel permeation chromatography and dynamic light scattering. (C) 2011 Elsevier Ltd. All rights reserved.