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Effect of fiber modification with 3-isopropenyl-dimethylbenzyl isocyanate (TMI) on the mechanical properties and water absorption of hemp-unsaturated polyester (UPE) composites

Authors
  • Liu, Wendi
  • Chen, Tingting
  • Qiu, Renhui
Type
Published Article
Journal
Holzforschung
Publisher
De Gruyter
Publication Date
Sep 18, 2013
Volume
68
Issue
3
Pages
265–271
Identifiers
DOI: 10.1515/hf-2013-0104
Source
De Gruyter
Keywords
License
Yellow

Abstract

Hemp fibers were modified with 3-isopropenyl-dimethylbenzyl isocyanate (TMI), in presence of dibutyltin dilaurate (DBT) as a catalyst. Then reinforced hemp-unsaturated polyester (UPE) composites were prepared with modified fibers by means of hand lay-up compression molding. The fiber treatments significantly increased the tensile strength (TS), flexural strength (FS), and water resistance of the resulting composites, while their flexural modulus (FM) was not influenced. The tensile-fractured surfaces of the composites were observed by SEM and the images revealed that fiber treatments significantly improved the interfacial adhesion between hemp fibers and UPE resins. FT-IR spectra and X-ray photoelectron spectroscopy (XPS) analysis indicated that the treated-fibers were partly covalently bound to TMI.

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