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Grafting polyisoprene onto surfaces of nanosilica via RAFT polymerization and modification of natural rubber
Author(s) -
Xiang Yixin,
Shen Xianrong,
Gao Jiangang,
Asiri Abdullah M.,
Marwani Hadi M.
Publication year - 2019
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.25096
Subject(s) - materials science , vulcanization , chain transfer , polymer chemistry , polymerization , chemical engineering , curing (chemistry) , nanoparticle , natural rubber , composite number , fourier transform infrared spectroscopy , grafting , surface modification , reversible addition−fragmentation chain transfer polymerization , raft , composite material , radical polymerization , polymer , nanotechnology , engineering
In this contribution, we reported the investigation of natural rubber (NR) reinforced by silicon dioxide‐ graft ‐polyisoprene (SiO 2 ‐ g ‐PIP) core–shell nanoparticle. First, the hydroxyl on the surface of the SiO 2 nanoparticles was reacted with 2‐methyl‐2‐[(dodecylsulfanylthiocarbonyl) sulfanyl] propanoic acid to produce trithioester‐capped SiO 2 (denoted as SiO 2 ‐CTA). SiO 2 ‐CTA was used as a nanoparticle chain transfer agent, and SiO 2 ‐ g ‐PIP core–shell nanoparticles were synthesized via reversible addition‐fragmentation chain transfer polymerization (RAFT). The results of FTIR spectroscopy and TGA showed that the grafting weight of the PIP block in SiO 2 ‐ g ‐PIP was 2.1 wt%. SiO 2 ‐ g ‐PIP and SiO 2 were simultaneously incorporated into NR. The curing properties of the NR compounds showed that the vulcanization rates of the NR/SiO 2 ‐ g ‐PIP compounds were much higher than those of NR/silica compounds. The results of scanning electron microscopy showed that SiO 2 microdomains in the NR/SiO 2 ‐ g ‐PIP vulcanizate were much better disperse and distribute than SiO 2 microdomains in the NR/SiO 2 composite. The filler–rubber interaction of the NR/SiO 2 ‐ g ‐PIP composite endowed the composite with improved mechanical properties. POLYM. ENG. SCI., 59:1167–1174 2019. © 2019 Society of Plastics Engineers