Journal
POLYMERS FOR ADVANCED TECHNOLOGIES
Volume 31, Issue 3, Pages 482-491Publisher
WILEY
DOI: 10.1002/pat.4785
Keywords
in situ nanosilica; mechanical properties; nanomatrix; natural rubber; solid Si-29-NMR
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Funding
- Vietnam National Foundation for Science and Technology Development [104.02-2017.35]
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Natural rubber (NR) with an in situ nanosilica nanomatrix was characterized in present work. The in situ nanosilica nanomatrix was prepared via graft copolymerization of a silane monomer, vinyltriethoxysilane (VTES), onto deproteinized NR (DPNR) in latex stage using tetrapentamine (TEPA)/tert-butylhydroperoxide (TBHPO) as initiators. VTES conversion of more than 80% was obtained, and it depended on VTES concentration. The graft copolymer structure was characterized by Fourier transform infrared (FT-IR), solution-state proton nuclear magnetic resonance (H-1-NMR), and solid-state Si-29-NMR spectroscopy. FT-IR analysis of the graft copolymer confirmed the formation of in situ silica particles, while solution-state H-1-NMR and solid-state Si-29-NMR revealed the partial hydrolysis of the ethoxy groups and polycondensation of the silanol groups. The formation of nanosilica particles enhanced thermal and mechanical properties of the graft copolymer. Morphology observations of the in situ nanosilica nanomatrix through scanning electron microscopy (SEM) and transmission electron microscopy (TEM) indicated that the spherical nanosilica particles form a nanomatrix surrounding NR particle. The formation of the nanomatrix was proved to enhance mechanical properties for NR materials.
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