Graft copolymerization of methyl methacrylate and vinyltriethoxysilane binary monomers onto natural rubber

This work presents two different paths of graft-copolymerization of methyl methacrylate (MMA) and vinyltriethoxysilane (VTES) binary monomers onto natural rubber (NR) to prepare NR/PMMA/silica hybrid materials and investigates their properties. The first path was performed by adding VTES during graf...

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Bibliographic Details
Published in:Journal of polymer research 2021-07, Vol.28 (7), Article 246
Main Authors: Nghiem Thi, Thuong, Cao Hong, Ha, Nurul Hayati, Yusof, Kawahara, Seiichi
Format: Article
Language:English
Subjects:
Acrylics
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Conversion
Copolymerization
Graft copolymers
Industrial Chemistry/Chemical Engineering
Latex
Monomers
Morphology
Natural rubber
NMR spectroscopy
Original Paper
Polymer Sciences
Polymethyl methacrylate
Silicon dioxide
Storage modulus
Structural analysis
Tensile strength
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Summary:This work presents two different paths of graft-copolymerization of methyl methacrylate (MMA) and vinyltriethoxysilane (VTES) binary monomers onto natural rubber (NR) to prepare NR/PMMA/silica hybrid materials and investigates their properties. The first path was performed by adding VTES during graft copolymerization of MMA onto NR initiated by TBHP/TEPA initiators. The second path was carried out with two consecutive graft copolymerizations of MMA and VTES, in which VTES was grafted onto the gross NR- graft -PMMA latex. The products prepared by these two paths were denoted as NR- graft -PMMA-PVTES, NR- graft -PMMA- graft -PVTES, respectively. The formation of PMMA and silica particles were confirmed through structural characterization by NMR spectroscopy. The NR- graft -PMMA- graft -PVTES has lower MMA conversion, higher MMA grafting efficiency, and higher VTES conversion than NR- graft -PMMA-PVTES. And it has higher tensile strength, higher hardness but lower storage modulus than NR-graft-PMMA-PVTES. However, the frequency dependence of loss tangent for NR- graft -PMMA- graft -PVTES did not follow the ordinary rubber elasticity as NR and NR- graft -PMMA-PVTES did. These were due to the different morphology of PMMA and silica in the graft copolymers.
ISSN:1022-9760
1572-8935
DOI:10.1007/s10965-021-02606-x