Influence of compounding and mixing on filler dispersion and curing behavior of silica compounds

Jungmin Jin

Research output: ThesisPhD Thesis - Research UT, graduation UT

1284 Downloads (Pure)


The research in this thesis deals with the effect of mixing process parameters and compound formulations on filler dispersion and curing behavior of silica compounds.
First of all, an overview about basic rubber technologies and theories related to the topic will be provided in Chapter 2.
Chapter 3: The origin of marching modulus of silica filled tire tread compounds is elaborated. The silica compounds with various types of silane coupling agent having different sulfidic bridges and functions are compared in terms of filler-filler interaction, filler-polymer interaction and sulfur donation effect on the marching modulus.
Chapter 4: Based on the results of Chapter 3, the influence of mixing parameters which are related to the degree of silanization as well as filler-polymer coupling reaction are investigated. Additionally, the essential ingredients for silica compounds which are possible to affect those reactions are investigated by compound mixing trials as well as model compound studies.
Chapter 5: The influence of compound formulations on the marching modulus phenomenon are described. The studies are performed by changing S-SBR/BR blending ratio and using silicas having different dispersibility.
Chapter 6: Several series of compounds are mixed in plant scale mixers (larger than 250L) in order to confirm the basic mechanism would be still valid regardless of the mixer scale. The effect of silanization time and temperature as well as rotor geometry on compound quality are compared in terms of influencing factors on marching modulus as well as filler dispersion quality.
Chapter 7: The relation between micro- and macro-dispersion of silica and their effect on rubber reinforcement is investigated. Additionally, the major influencing factors on micro- and macro-dispersion of silica are identified.
Chapter 8: An overall summary of this thesis is given.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • University of Twente
  • Dierkes, Wilma K., Supervisor
  • Blume, Anke, Co-Supervisor
  • Noordermeer, Jacques W.M., Advisor
Thesis sponsors
Award date11 Mar 2020
Place of PublicationEnschede
Print ISBNs978-90-365-4926-4
Electronic ISBNs978-90-365-4926-4
Publication statusPublished - 11 Mar 2020


  • Silica compound
  • Mixing
  • Tire treads
  • Marching modulus
  • Curing behavior
  • Vulcanization behavior
  • Dispersion
  • Filler dispersion
  • Silica dispersion


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