Isocyanate-rich cellulose nanocrystals and their selective insertion in elastomeric polyurethane

被引：85

作者：

Rueda, L. ^{[1
]}

Fernandez d'Arlas, B. ^{[1
]}

Zhou, Q. ^{[2
,3
]}

Berglund, L. A. ^{[2
,4
]}

Corcuera, M. A. ^{[1
]}

Mondragon, I. ^{[1
]}

Eceiza, A. ^{[1
]}

机构：

[1] Univ Basque Country, Polytech Sch, Dept Chem & Environm Engn, Mat Technol Grp, Donostia San Sebastian 20018, Spain

[2] Royal Inst Technol, Dept Fibre & Polymer Technol, SE-10044 Stockholm, Sweden

[3] AlbaNova Univ Ctr, Royal Inst Technol, Sch Biotechnol, SE-10691 Stockholm, Sweden

[4] Royal Inst Technol, Wallenberg Wood Sci Ctr, SE-10044 Stockholm, Sweden

来源：

COMPOSITES SCIENCE AND TECHNOLOGY | 2011年 / 71卷 / 16期

关键词：

Nanocomposites; Cellulose nanocrystals; Thermomechanical properties; Atomic force microscopy (AFM); Casting; MULTIPLE MELTING ENDOTHERMS; BLOCK CONTENT POLYURETHANE; MICROCRYSTALLINE CELLULOSE; SURFACE MODIFICATION; FIBERS; BIONANOCOMPOSITES; WHISKERS; ORIGIN;

D O I：

10.1016/j.compscitech.2011.09.014

中图分类号：

TB33 [复合材料];

学科分类号：

摘要：

Cellulose nanocrystals (CNC) were successfully obtained and modified with 1,6-hexamethylene diisocyanate (HE)!) by means of in situ polymerization varying the CNC/HDI molar ratio to evaluate the number of anchored chains to the CNC. The modification was examined by elemental analysis, nuclear magnetic resonance (C-13 NMR) and attenuated total reflection Fourier transform infrared spectroscopy (IR-ATR). Nanocomposites containing 1.5 wt% CNC, modified and unmodified, were prepared by solvent casting. Thermal and mechanical properties of the resulting films were evaluated from the viewpoint of polyurethane microphase separated structure, soft and hard domains. CNC were effectively dispersed in the polyurethane matrix and depending on surface chemistry, the nanoreinforcement interacts selectively with matrix nanodomains. This interpretation is supported by differences in thermal and mechanical properties of the nanocomposites and also confirmed by AFM images. Isocyanate rich cellulose nanocrystals interacted with matrix hard phase, promoting physical association with hard segments, enhancing stiffness and dimensional stability versus temperature of the nanocomposite. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1953 / 1960

页数：8

共 25 条

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