Properties of HVA-2 vulcanized high density polyethylene/natural rubber/thermoplastic tapioca starch blends

Blending of high density polyethylene (HDPE), natural rubber (NR), and thermoplastic tapioca starch (TPS) has been studied. Two series of blends having 5 wt %, 10 wt %, 20 wt %, and 30 wt % TPS were prepared: (a) unvulcanized blends and (b) N, N′‐m‐phenylenebismaleimide (HVA‐2) vulcanized HDPE/NR/TP...

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Bibliographic Details
Published in:Journal of applied polymer science 2013-05, Vol.128 (4), p.2479-2488
Main Authors: Kahar, A. W. M., Ismail, H., Othman, N.
Format: Article
Language:English
Subjects:
Applied sciences
biodegradable
Blends
Crosslinking
Exact sciences and technology
High density
Materials science
mechanical properties
Natural polymers
Natural rubber
Physicochemistry of polymers
Polyethylenes
Polymer blends
Polymers
Starch and polysaccharides
Starches
thermal properties
Thermoplastic resins
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Summary:Blending of high density polyethylene (HDPE), natural rubber (NR), and thermoplastic tapioca starch (TPS) has been studied. Two series of blends having 5 wt %, 10 wt %, 20 wt %, and 30 wt % TPS were prepared: (a) unvulcanized blends and (b) N, N′‐m‐phenylenebismaleimide (HVA‐2) vulcanized HDPE/NR/TPS blends. The composition of HDPE/NR was fixed at blend ratio of 70/30. Tensile strength, Young's modulus, and elongation at break exhibited significant improvement when HDPE/NR/TPS blends were subject to HVA‐2 crosslinker. Tensile strength increased to 1.4 MPa, 2.3 MPa, 3.4 MPa, and 5.1 MPa from 15 MPa, 12 MPa, 9.7 MPa, and 7.87 MPa of unvulcanized counterparts. SEM micrographs showed fine TPS dispersion and well embedded in vulcanized HDPR/NR matrix. Comparison were also made based on the results of gel content, thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA). The improvement in tensile properties, thermal stability, and blends modulus can be correlated to the crosslink formation within the NR phase. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
ISSN:0021-8995
1097-4628
DOI:10.1002/app.38471