Polymer Bulletin

, Volume 76, Issue 2, pp 883–902 | Cite as

Exploring the comparative effect of silane coupling agents with different functional groups on the cure, mechanical and thermal properties of nano-alumina (Al2O3)-based natural rubber (NR) compounds

  • Kumarjyoti Roy
  • Pranut PotiyarajEmail author
Original Paper


The surface of sol–gel-synthesized nano-alumina (Al2O3) was modified by three types of silane coupling agents with different specific functionalities, namely 3-aminopropyltriethoxysilane (APTES), triethoxy(octyl)silane (OCTEOS) and bis[3-(triethoxysilyl)propyl]tetrasulfide (TESPT). The aim of the present study was to explore the effect of both unmodified and surface-modified nano-Al2O3 on the cure characteristics, mechanical properties, cross-link density and thermal stability of natural rubber (NR) nanocomposites. Results revealed that silane coupling agents were very effective to enhance maximum rheometric torque (R) and mechanical properties like modulus and tensile strength of nano-Al2O3-based NR nanocomposites. APTES offered higher value of cure rate index for NR compounds as compared to two other silane coupling agents. Among three silane coupling agents, TESPT provided highest improvement in the mechanical properties of NR/nano-Al2O3 composites. This might be explained by considering excellent improvement in the cross-link density of NR compounds in the presence of TESPT-treated nano-Al2O3. The incorporation of both TESPT- and OCTEOS-modified nano-Al2O3 into the NR matrix markedly improved the thermal stability of NR composites. Moreover, bi-functional silane TESPT not only increased the hydrophobicity of nano-Al2O3, but also improved the probability of sulfur cross-linking during cure process of NR compounds.


Nanocomposites Silane coupling agents Mechanical properties Cross-link density Thermal stability 



One of the authors, Kumarjyoti Roy would like to thank postdoctoral fellowship supported by Ratchadaphiseksomphot Endowment Fund, Chulalongkorn University for fellowship assistance.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Materials Science, Faculty of ScienceChulalongkorn UniversityBangkokThailand
  2. 2.Center of Excellence on Petrochemical and Materials TechnologyChulalongkorn UniversityBangkokThailand

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