Thermoset nanocomposites from two-component waterborne polyurethanes and cellulose whiskers

Guo-min Wu; Jian Chen; Shu-ping Huo; Gui-feng Liu; Zhen-wu Kong

doi:10.1016/j.carbpol.2014.01.095

Thermoset nanocomposites from two-component waterborne polyurethanes and cellulose whiskers

Carbohydr Polym. 2014 May 25:105:207-13. doi: 10.1016/j.carbpol.2014.01.095. Epub 2014 Feb 5.

Authors

Guo-min Wu¹, Jian Chen², Shu-ping Huo², Gui-feng Liu³, Zhen-wu Kong³

Affiliations

¹ Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry; Key Laboratory of Biomass Energy and Material of Jiangsu Province; Key and Open Laboratory on Forest Chemical Engineering, State Forestry Administration; National Engineering Laboratory for Biomass Chemical Utilization, Nanjing 210042, China; Research Institute of New Technology, Chinese Academy of Forestry, Beijing 10091, China. Electronic address: [email protected].
² Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry; Key Laboratory of Biomass Energy and Material of Jiangsu Province; Key and Open Laboratory on Forest Chemical Engineering, State Forestry Administration; National Engineering Laboratory for Biomass Chemical Utilization, Nanjing 210042, China.
³ Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry; Key Laboratory of Biomass Energy and Material of Jiangsu Province; Key and Open Laboratory on Forest Chemical Engineering, State Forestry Administration; National Engineering Laboratory for Biomass Chemical Utilization, Nanjing 210042, China; Research Institute of New Technology, Chinese Academy of Forestry, Beijing 10091, China.

PMID: 24708971
DOI: 10.1016/j.carbpol.2014.01.095

Abstract

We prepared thermoset nancomposites from biomass-based two-component waterborne polyurethane (2K-WPU) and cellulose namowhiskers (CNWs). Due to the formation of hydrogen bonds, the viscosity of 2K-WPU dispersion was found to be increased with the addition of CNWs. SEM images showed "sea-island structure" corresponding to the microphase separation between CNWs nano-filler and the 2K-WPU matrix. The α-relaxation temperature (Tα) and glass transition temperature (Tg) increased with the increase of CNWs content, which was due to the formation of a rigid CNWs nano-phase acting as crosslinking points in the 2K-WPU matrix. Mechanical properties from tensile test showed Young's modulus and tensile strength of 2K-WPU/CNWs nanocomposites were reinforced by the addition of CNWs. Thermo-stability of 2K-WPU/CNWs nanocomposites decreased slightly with the increase of CNWs content, which could be attributed to the increased thermal conductivity of the material after adding CNWs.

Keywords: Cellulose nanowhiskers; Nanocomposite; Turpentine; Two-component waterborne polyurethanes.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Biomass
Cellulose / chemistry*
Elastic Modulus
Hydrogen Bonding
Nanocomposites / chemistry*
Nanocomposites / ultrastructure
Polyurethanes / chemistry*
Rheology
Temperature
Tensile Strength
Thermal Conductivity
Transition Temperature
Turpentine / chemistry
Viscosity

Substances

Polyurethanes
Cellulose
Turpentine