Functionalization of liquid natural rubber via oxidative degradation of natural rubber

Suhawati Ibrahim, Rusli Daik, Ibrahim Abdullah

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Natural rubber (NR) is a high molecular weight natural polymer and can be degraded to liquid natural rubber (LNR) leaving certain functional groups at the end of chains. In this study, LNR samples prepared via oxidative degradation using H2O2 and NaNO2 as reagents were found to have different end groups depending on the pH of the reaction medium. In an acidic medium, LNR with hydroxyl terminal groups was formed as the degradation reaction was initiated by hydroxyl radicals produced from decomposition of peroxynitrite acid. In contrast, a redox reaction took place in an alkaline medium to yield LNR with carbonyl terminal groups. The mechanisms of reaction are discussed and proposed to explain the formation of different end groups when reaction carried out in acidic and alkaline media. Chain degradation in an acidic medium seems to be more effective than in an alkaline medium, and thus yields LNR with lower Mn.

Original languageEnglish
Pages (from-to)2928-2941
Number of pages14
JournalPolymers
Volume6
Issue number12
DOIs
Publication statusPublished - 2014

Fingerprint

Rubber
Degradation
Liquids
Hydroxyl Radical
Natural polymers
Peroxynitrous Acid
Redox reactions
Functional groups
Molecular weight
Decomposition
Acids

Keywords

  • Functionalized natural rubber (NR)
  • Liquid natural rubber
  • NR degradation
  • OH terminated rubber

ASJC Scopus subject areas

  • Polymers and Plastics
  • Chemistry(all)

Cite this

Functionalization of liquid natural rubber via oxidative degradation of natural rubber. / Ibrahim, Suhawati; Daik, Rusli; Abdullah, Ibrahim.

In: Polymers, Vol. 6, No. 12, 2014, p. 2928-2941.

Research output: Contribution to journalArticle

Ibrahim, Suhawati ; Daik, Rusli ; Abdullah, Ibrahim. / Functionalization of liquid natural rubber via oxidative degradation of natural rubber. In: Polymers. 2014 ; Vol. 6, No. 12. pp. 2928-2941.
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