Depolymerization of Natural Rubber Latex Using Phenylhydrazine-FeCl<sub>2</sub>System

Huy, Ha Thuc; Nga, Nguyen Tuyet; Hong, Le Quang; Son, Chu Pham Ngoc

doi:10.1080/10601329608011016

Cited by 4 publications

(2 citation statements)

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“…Various degradation reagents such as phenylhydrazine-ferrous chloride [21], periodic acid [10], potassium persulfate and propanal [22,23] as well as ozone [24] had been used in the preparation of LNR and epoxidized LNR in latex state. Gazeley and Mante [25] patented a method of producing LNR latex using peroxides and metal nitrite.…”

Section: Introductionmentioning

confidence: 99%

Functionalization of Liquid Natural Rubber via Oxidative Degradation of Natural Rubber

2014

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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.

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Section: Introductionmentioning

confidence: 99%

Functionalization of Liquid Natural Rubber via Oxidative Degradation of Natural Rubber

2014

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“…Various degradation reagents such as phenylhydrazine-ferrous chloride [4], phenylhydrazine-atmospheric oxygen, periodic acid [5], potassium persulfate and propanal [6] as well as ozone [7] had been used in the preparation of LNR and epoxidized LNR in latex state. Ravindran and coworkers [2] reported the production of HTLNR by photochemical depolymerization of NR toluene solution at room temperature in the presence of H 2 O 2 and homogenizing agents such as methanol and THF.…”

Section: Introductionmentioning

confidence: 99%

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

Giang

Thao

Huong

et al. 2016

JST

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Hydroxyl terminated liquid natural rubber (HTLNR) was prepared by the depolymerization of deproteinized natural rubber (DPNR) in mixture of toluene and water at 60 o C for 24 hours in the presence of ammonium persulfate as an initiator and tetrahydrofuran (THF) as a homogenizing agent. GPC analysis revealed that the number-average molecular weight (M n ) and weight-average molecular weight (M w ) of HTLNR were found to be 4.334×10 3 g/mol and 11.702×10 3 g/mol, respectively, with polydispersity index (PDI) of 2.7. The chemical structure of HTLNR was determined by FTIR and 1 H-NMR and 13 C-NMR spectroscopic analysis. Based on the analytical data the mechanism of depolymerization and hydroxylation of NR to form HTNR was also suggested.Keywords: deproteinized natural rubber (DPNR), hydroxyl terminated liquid natural rubber (HTLNR), depolymerization of natural rubber, oxidative degradation.

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Characterisation of liquid epoxidised natural rubber (LENR) upon storage

et al. 2021

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Depolymerization of Natural Rubber Latex Using Phenylhydrazine-FeCl₂System

Cited by 4 publications

References 5 publications

Functionalization of Liquid Natural Rubber via Oxidative Degradation of Natural Rubber

Functionalization of Liquid Natural Rubber via Oxidative Degradation of Natural Rubber

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

Characterisation of liquid epoxidised natural rubber (LENR) upon storage

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Depolymerization of Natural Rubber Latex Using Phenylhydrazine-FeCl2System

Cited by 4 publications

References 5 publications

Functionalization of Liquid Natural Rubber via Oxidative Degradation of Natural Rubber

Functionalization of Liquid Natural Rubber via Oxidative Degradation of Natural Rubber

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

Characterisation of liquid epoxidised natural rubber (LENR) upon storage

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Depolymerization of Natural Rubber Latex Using Phenylhydrazine-FeCl₂System