Synthesis of hydroxyl terminated liquid natural rubber by oxidative deproteinized natural rubber

  • Lê Đức Giang
  • Đinh Mộng Thảo
  • Hoàng Thị Hướng
  • Lê Thị Thu Hiệp


Hydroxyl terminated liquid natural rubber (HTLNR) was prepared by the depolymerizatioQ of deproteinized natural rubber (DPNR) in mixture of toluene and water at 60 °c for 24 hours in the presence of ammonium persulfate as an initiator and tehahydrofuran (THF) as a homogenizing agent. GPC analysis revealed that the number-average molecular weight (M„) and weight-average molecular wei^t (M„.) of HTLNR were found to be 4.334x10° g/moi and 11.702x10^ g/mol. respectively, with polydispersity index (PDI) of 2.7. The chemical structure of HTLNR was determined by FTIR and 'H-NMR and '^C-NMR spectroscopic analysis. Based on the analytical data the mechanism of depolymerization and hydroxylation of NR to form HTNR was also suggested.

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