Effect of Aminosilane Concentrations on the Properties of Poly(Lactic Acid)/Kenaf-Derived Cellulose Composites

To reinforce the use of kenaf-derived cellulose as a compatible plastic filler, the cellulose (C) was thermally grafted with various concentrations (5, 8, and 11 wt.%) of hydrolysed 3-aminopropyltriethoxysilane (APS). The silane-grafted cellulose (SGC) were named as SGC5, SGC8 and SGC11. C (30 wt.%)...

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Bibliographic Details
Published in:Polymers & polymer composites 2017-01, Vol.25 (1), p.63-76
Main Authors: Tee, Yee Bond, Talib, Rosnita A., Abdan, Khalina, Chin, Nyuk Ling, Basha, Roseliza Kadir, Yunos, Khairul Faezah Md
Format: Article
Language:English
Subjects:
Acids
Analysis
Barriers
Biomaterials
Cellulose
Composite materials
Food
Food packaging
Forest products
Fourier transforms
Infrared spectroscopy
Lignin
NMR
Nuclear magnetic resonance
Polymeric composites
Polymers
Properties
Reinforcement
Sheets
Silane
Spectrum analysis
Studies
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Summary:To reinforce the use of kenaf-derived cellulose as a compatible plastic filler, the cellulose (C) was thermally grafted with various concentrations (5, 8, and 11 wt.%) of hydrolysed 3-aminopropyltriethoxysilane (APS). The silane-grafted cellulose (SGC) were named as SGC5, SGC8 and SGC11. C (30 wt.%) and all of the SGC were respectively melt-compounded into poly(lactic acid) (PLA) before being hot-pressed into ∼0.3 mm sheets, which is the approximate thickness of clamshell packaging. The intermolecular interaction between SGC and PLA, which was absent with C, was confirmed via Fourier Transform Infrared Spectroscopy (FTIR). PLA filled with SGC5 or SGC8 showed significant improvement in thermal, tensile, physical, and barrier properties compared with the PLA/C composite. In contrast, adverse effects were observed with the PLA/SGC11 composite. 8 wt.% of APS was concluded as the critical concentration to be thermally-grafted onto the kenaf-derived cellulose as PLA/SGC8 composite showed optimum reinforcement in tensile strength (52 MPa), crystallizability (16% crystallinity), water resistance (5.3%) and dimensional stability (3.3%), and significantly shifted oxygen barrier from medium-low range to medium range (3.2 ×10−17 m3 m/m2 s Pa). Overall, the variation in the properties of these biocomposites may extend PLA's range in food packaging applications.
ISSN:0967-3911
1478-2391
DOI:10.1177/096739111702500110