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Oil resistance and physical properties of in situ epoxidized natural rubber from high ammonia concentrated latex
Author(s) -
Chuayjuljit S.,
Yaowsang C.,
NaRag N.,
Potiyaraj P.
Publication year - 2006
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.22998
Subject(s) - natural rubber , compression set , vulcanization , materials science , ultimate tensile strength , glass transition , swelling , composite material , nitrile rubber , formic acid , polymer chemistry , chemistry , organic chemistry , polymer
Epoxidized natural rubber (ENR) was prepared via in situ epoxidation from high ammonia concentrated natural rubber latex with formic acid and hydrogen peroxide in the presence of a surfactant at 50°C for 4, 8, and 12 h. The obtained ENRs containing 20, 45, and 65 mol % of expoxide groups were denoted ENR20, ENR45, and ENR65, respectively. The differential scanning calorimetric study revealed that they exhibited higher glass transition temperatures than that of natural rubber (−62.4°C), at −38.2°C for ENR20, −27.8°C for ENR45, and −19.7°C for ENR 65. It was clearly seen that their glass transition temperatures increased as the amount of epoxide groups increased. The prepared ENRs were compounded and vulcanized to prepare test specimens for determination of oil resistance and various physical properties. It was found that the swelling of ENRs in oils was substantially less than that of natural rubber. The oil resistance of ENR65 was comparable to that of nitrile rubber, commonly used as oil resistant rubber. ENR65 also showed higher hardness than other ENRs. Contrarily, ENR20 possessed superior tensile strength and compression set when compared with other ENRs. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3948–3955, 2006