Coalescence Suppression in Flowing Polymer Blends Using Silica Rods with Different Surface Chemistries

Silica rods with homogeneous (hydrophilic or hydrophobic) and amphiphilic surface properties were synthesized and their efficiencies in suppressing the flow-induced droplet coalescence of immiscible polyisobutylene (PIB)/polydimethylsiloxane (PDMS) blends were evaluated via in situ visualization tec...

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Bibliographic Details
Published in:Chinese journal of polymer science 2021-04, Vol.39 (4), p.474-483
Main Authors: Xiang, Si-Ying, Ye, Li-Sa-Ya, Huang, Ya-Jiang, Lv, Ya-Dong, Kong, Mi-Qiu, Li, Guang-Xian
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Coalescing
Condensed Matter Physics
Hydrophilicity
Industrial Chemistry/Chemical Engineering
Morphology
Polydimethylsiloxane
Polyisobutylene
Polymer blends
Polymer Sciences
Rods
Scanning microscopy
Silicon dioxide
Surface properties
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Summary:Silica rods with homogeneous (hydrophilic or hydrophobic) and amphiphilic surface properties were synthesized and their efficiencies in suppressing the flow-induced droplet coalescence of immiscible polyisobutylene (PIB)/polydimethylsiloxane (PDMS) blends were evaluated via in situ visualization technique. The flow-induced coalescence behavior of blends was found to strongly depend on the surface nature and concentration of silica rods added as well as the blend ratio. While a trace amount of rods promoted coalescence, all kinds of rods demonstrated a morphology refinement effect at high rod concentrations. Good compatibilization effects were obtained at high rod concentrations, especially for hydrophilic and amphiphilic rods. Based on confocal laser scanning microscopy results, these phenomena observed were interpreted reasonably in terms of the selective distribution and aggregation of silica rods, which were suggested to be decisive for the stabilization mechanism and efficiency of these rods.
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-021-2526-y