Chemical modification of hemp fibers by silane coupling agents

Natural hemp fibers were chemically modified using silane coupling agents to reduce their hydrophilic character. The existence of a chemical bond between coupling agents and hemp fibers was confirmed by ATR‐FTIR spectroscopy, 29Si Nuclear Magnetic Resonance (NMR), thermogravimetric analysis (TGA), e...

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Bibliographic Details
Published in:Journal of applied polymer science 2012-01, Vol.123 (1), p.601-610
Main Authors: Rachini, Ali, Le Troedec, Marianne, Peyratout, Claire, Smith, Agnès
Format: Article
Language:English
Subjects:
29Si CP/MAS NMR spectroscopy
Applied sciences
ATR-FTIR Spectroscopy
Chemical Sciences
Compounding ingredients
Coupling agents
differential thermogravimetric analysis (DTA/TGA)
Exact sciences and technology
Fibers
Fibers and threads
Fillers and reinforcing agents
Forms of application and semi-finished materials
Grafting
heat treatment
Hemp
hemp fibers
Hydrogen bonds
Material chemistry
Materials science
Nuclear magnetic resonance
Polymer industry, paints, wood
Polymers
silane grafting
Silanes
Spectroscopy
surface properties
Technology of polymers
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Summary:Natural hemp fibers were chemically modified using silane coupling agents to reduce their hydrophilic character. The existence of a chemical bond between coupling agents and hemp fibers was confirmed by ATR‐FTIR spectroscopy, 29Si Nuclear Magnetic Resonance (NMR), thermogravimetric analysis (TGA), energy dispersive spectroscopy (EDS), and BET surface area measurements. It was shown that the initial concentration and the chemical structure of the organosilane coupling agent have an effect on the grafted quantity on the hemp fiber surfaces. The grafted quantity increased proportionally to the initial concentration of silane molecules. The presence of polar amino end group (NH2) in silane structure can cause an increase in the grafted quantity, compared with results obtained in the case of silane molecules containing methacryloxy groups. This effect is attributed to the formation of hydrogen bonds between NH2 and unreacted hydroxyl groups of hemp fibers. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
ISSN:0021-8995
1097-4628
1097-4628
DOI:10.1002/app.34530