Improvement of Thermal and Mechanical Properties of Vietnam Deproteinized Natural Rubber via Graft Copolymerization with Methyl Methacrylate

In this study, we investigated the improvement of the thermal and mechanical properties of Vietnam deproteinized natural rubber (DPNR) via graft copolymerization of methyl methacrylate (MMA). The graft copolymerization was achieved successfully in latex stage using tert-butyl hydroperoxide (TBHPO) a...

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Bibliographic Details
Published in:International journal of polymer science 2020, Vol.2020 (2020), p.1-11
Main Authors: Thuy, T. T., Huy, Tung Nguyen, Van, Nam Nguyen, Nguyen, Thu Ha, Thi, Thuong Nghiem, Dung, T. A., Duy, Hieu Nguyen, Nhan, N. T., Quang, Tung Tran
Format: Article
Language:English
Subjects:
Batch processing
Butyl hydroperoxide
Chemicals
Copolymerization
Efficiency
Emulsion polymerization
Fourier transforms
Free radicals
Graft copolymers
Heat resistance
Initiators
Latex
Mechanical properties
Molecular weight
Natural rubber
NMR
Nuclear magnetic resonance
Polymers
Polymethyl methacrylate
Proteins
Rubber
Storage modulus
Sulfur
Tear strength
Tensile strength
Thermodynamic properties
Vulcanization
Zinc oxides
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Summary:In this study, we investigated the improvement of the thermal and mechanical properties of Vietnam deproteinized natural rubber (DPNR) via graft copolymerization of methyl methacrylate (MMA). The graft copolymerization was achieved successfully in latex stage using tert-butyl hydroperoxide (TBHPO) and tetra-ethylenepentamine (TEPA) as radical initiators at 30°C. By grafting with various MMA feeds and initiator concentration of 6.6×10−5 mol/g-rubber, the highest grafting efficiency and conversion were achieved at MMA of 15 wt.% per kg of rubber, 68% and 90%, respectively. The structure of grafted copolymers was characterized by 1H NMR, FTIR-ATR, and GPC, and thermal properties were investigated through DSC and TGA measurements. These showed that graft copolymers were more stable and rigid than DPNR. Storage modulus (G′) of graft copolymer was found to double that of DPNR, which contributed to the formation of graft copolymer. After sulfur vulcanization, the mechanical properties of DPNR-graft-PMMA, such as tensile strength, tear strength, and hardness, were improved significantly. Curing behaviors of the graft copolymers were found to be remarkably better than virgin DPNR.
ISSN:1687-9422
1687-9430
DOI:10.1155/2020/9037827