Comparative behavior of in situ silica generation in saturated rubbers: EPDM and hydrogenated natural rubber. Issue 17 (6th January 2017)

• Record Type: Journal Article
• Authors: Ongwongsakul, Kitti; Rempel, Garry L.; Poompradub, Sirilux; Hinchiranan, Napida
• Is Part Of: Journal of applied polymer science. Volume 134:Issue 17(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-01-06
• Subjects: EPDM -- hydrogenated natural rubber -- in situ silica -- sol‐gel reaction; Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.44748
• Languages: English
• ISSNs: 0021-8995

Abstract

ABSTRACT: Role of carbon‐carbon double (CC) bonds content and their position in ethylene‐propylene diene ter‐polymer (EPDM), hydrogenated natural rubber (HNR) and natural rubber (NR) on in situ silica formation using tetraethoxysilane (TEOS) as a silica precursor is comparatively investigated. Glass transition temperature ( Tg ) reflecting rubber chain flexibility is found as an important factor for in situ silica generation via swelling method. Despite of similar solubility parameters, NR has higher TEOS‐swelling degree resulting in the higher in situ silica content (30.8 phr) than EPDM (3.50 phr) and HNR (10.4–17.6 phr) due to the higher Tg of EPDM and HNR providing the less chain flexibility to be swollen in TEOS solution. The morphological analysis implies that CC bonds in saturated rubbers may be agglomeration sites for in situ silica particles. For practical applications, saturated rubbers containing in situ silica/NR vulcanizates showed the improvement of mechanical properties and resistance of thermal and ozone degradation. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2017, 134, 44748. Abstract :