文献类型：期刊文献

英文题名：Cellulose nanocrystals: A layered host candidate for fabricating intercalated nanocomposites

作者：Guo, Juan[1,2] Du, Wenbo[3] Wang, Siqun[1,4] Yin, Yafang[1,2] Gao, Yong[3]

第一作者：郭娟

通信作者：Yin, YF[1];Gao, Y[2]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Dept Wood Anat & Utilizat, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry New Technol, Beijing 100091, Peoples R China;[3]Xiangtan Univ, Coll Chem, Xiangtan 411105, Peoples R China;[4]Univ Tennessee, Ctr Renewable Carbon, Knoxville, TN 37996 USA

年份：2017

卷号：157

起止页码：79-85

外文期刊名：CARBOHYDRATE POLYMERS

收录：;EI(收录号：20164002863210);Scopus(收录号：2-s2.0-84988878458);WOS:【SCI-EXPANDED(收录号:WOS:000391896800010)】；

基金：This work was supported financially by a project of Research Institute for Forestry New Technology, Chinese Academy of Forestry (No. CAFINT2014K03), the National Nonprofit Institute Research Grant of CAFINT, China. We are very grateful to Mrs Xuxia Guo, Dr. Lichao Jiao and Dr. MM Yu of the Chinese Academy of Forestry for the valuable discussions, Dr. Yuan Cao of State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry for the morphology investigation.

语种：英文

外文关键词：Cellulose nanocrystals; Intercalation; X-ray diffraction; Molecular structure; Thermal properties

摘要：The stacking of cellulose chains along planes and weak intersheet interactions make cellulose nanocrystals (CNCs) promising as a layered host candidate for fabricating intercalated nanocomposites. As a proof-of-concept, we demonstrate the intercalation of alkyls into CNCs through the in situ intercalative chemical reaction between terminal groups of N-octadecyl isocyanates and hydroxyl groups on the (200) planes in CNCs. Results showed that CNCs could intercalate alkyls in a high degree of substitution to form dense brushes on their (200) planes. After intercalation, a significant enlargement of interlayer spacing was observed. Moreover, alkyls were fully extended in all-trans configuration and crystallized in a co-existing organization of alpha(H), beta(H) and beta(o) crystalline forms. This meant that the molecular arrangement in CNCs/alkyl intercalated nanocomposites would involve a bilayer model in which alkyls were in the ordered packing and titled to (200) plane. Furthermore, CNCs/alkyl intercalated nanocomposites possessed increased thermal properties and decreased char residue. (C) 2016 Elsevier Ltd. All rights reserved.