Modification of epoxidized natural rubber from natural rubber latex

Name: Kitnipat Ngudsuntear

LCSH: Kasetsart University -- Dissertations. Ph.D. (Chemical Engineering) 2022

Classification :.LCCS: TS1892

LCSH: Kasetsart University. -- Department of Chemical Engineering -- Dissertations

LCSH: Rubber

LCSH: Latex

LCSH: Vulcanization

Abstract: Epoxidized natural rubber (ENR) was synthesized using performic acid generated from the reaction of formic acid/H2O2 in the latex stage, followed by hydrogenation using diimide generated from hydrazine (N2H4) and H2O2with boric acid (H3BO3) as a promoter. The natural rubber (NR) and modified NR productswere subjected to a sulfur cure using a conventional milling process. The cure characteristics, mechanical properties before and after thermal and oil aging, and ozone resistances were examined. The hydrogenated epoxidized natural rubber(HENR) was characterized by 1H-NMR, gel tester, TEM, DSC, and TGA. The effects of reaction parameters such as N2H4, H2O2, H3BO3, and gelatin amount and reaction time and temperature on hydrogenation degree (%HD) and gel content were investigated. The TEM of the particles confirmed the formation of a core/shell structure, which indicated a reduction in the number of double bonds. Overall, the results showed an increase in reaction parameters favorable to the %HD. As the %HD increased, the gel content increased due to ether linkage and hydroxyl radicals triggering the crosslinking reaction. The modified NR vulcanizate exhibited longer processing time and lower tensile strength, whereas the Modulus at 100% elongation was higher than the unfilled NR composite. Additionally, their heat, oil, and ozone resistances were better than those of NR vulcanizate due to the presence of epoxide groups and a reduction in the number of double bonds in the backbone chain. Thus, the hydrogenation of ENR provides new material for a wide range of applications with more excellent thermal stability and oil and ozone resistance than NR.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Sunan Limtrakul

Role: Thesis Advisor

Name: Terdthai Vatanatham

Role: Thesis CO-Advisor

Name: Wanvimon Arayapranee

Role: Thesis CO-Advisor

Created: 2022

Modified: 2025-07-14

Issued: 2025-07-14

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2565/kitnipat-ngu-all.pdf

CallNumber: TS1892 .K58

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degraee

Descipline: Chemical Engineering

Grantor: Kasetsart University

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