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Properties of natural rubber composites with structurally different clay intercalable surfactants
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SYSNO ASEP 0475154 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Properties of natural rubber composites with structurally different clay intercalable surfactants Author(s) Sedničková, M. (SK)
Jochec-Mošková, D. (SK)
Janigová, I. (SK)
Kronek, J. (SK)
Jankovič, L. (SK)
Šlouf, Miroslav (UMCH-V) RID, ORCID
Chodák, I. (SK)Article number 105 Source Title Journal of Polymer Research. - : Springer - ISSN 1022-9760
Roč. 24, č. 7 (2017), s. 1-13Number of pages 13 s. Language eng - English Country TW - Taiwan, Province of China Keywords composite ; natural rubber ; clay Subject RIV CD - Macromolecular Chemistry OECD category Polymer science Institutional support UMCH-V - RVO:61389013 UT WOS 000402912600002 EID SCOPUS 85020631005 DOI 10.1007/s10965-017-1261-0 Annotation Three different surface modifications of montmorillonite (MMT) have been investigated regarding the modifier effect on the ultimate properties of natural rubber-clay nanocomposites. The reference filler was modified by natrification of the native MMT, and was subsequently modified by two alkylammonium salts to achieve exchange of Na+ with selected organic cations, either octadecyltrimethylammonium (ODTMA) or oleyltrimethylammonium (OLEYL). Consequently, varying concentrations of MMT fillers (1, 3, 5 and 10 phr) were mixed with the elastomeric matrix natural rubber SMR 20 aimed to melt intercalation. For both composites containing organo-modified fillers, vulcanization characteristics revealed an increase of curing rate with rising filler concentrations, while XRD diffraction indicated the formation of intercalated as well as exfoliated structures. The morphology of the natural rubber-clay composites examined by electron microscopy (TEM and SEM) supported the conclusions of the XRD results regarding the intercalation and exfoliation of the surface-modified fillers to smaller nano-size aggregates, particularly tactoids of a few layers or a few thin clay layers. Tensile strength and elongation at break, increased with rising mass content of MMT fillers in the composites. The dependences indicate certain differences in the reinforcement mechanism depending on the surface modifier. While the effect of ODTMA consists in substantial hydrophobization of the surface, it is suggested that OLEYL filler apparently participates also in vulcanization reaction by the double bond in the middle of the aliphatic chain of the ligand. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2018
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