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Interfacially compatibilized PI/PDMS blends with reduced octadecylamine-functionalized graphene oxide: morphological
Jaber Nasrollah Gavgani1, Fatemeh Goharpey1, Sachin Velankar2
1Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, P.O.Box-15875-4413, Tehran, Iran. goharpey@aut.ac.ir.
Soft Matter
|October 11, 2021
Summary
Reduced octadecylamine-functionalized graphene oxide (ODA-GO) stabilizes immiscible polymer blends like polydimethylsiloxane (PDMS) and polyisoprene (PI). ODA-GO addition refines droplet morphology and suppresses coalescence, enhancing blend properties.
Area of Science:
- Polymer Science
- Materials Science
- Nanotechnology
Background:
- Immiscible polymer blends often exhibit poor interfacial adhesion and phase separation.
- Stabilizing these interfaces is crucial for developing materials with tailored properties.
- Graphene oxide derivatives offer potential as effective interfacial stabilizers.
Purpose of the Study:
- To investigate the interfacial compatibilization effect of reduced octadecylamine-functionalized graphene oxide (ODA-GO).
- To analyze the impact of ODA-GO on the morphological and rheological properties of polydimethylsiloxane (PDMS)/polyisoprene (PI) blends.
- To explore ODA-GO as a strategy for creating advanced polymer blends.
Main Methods:
- Preparation of droplet-matrix blends with varying PI:PDMS ratios (30:70 and 70:30).
- Interfacial localization of ODA-GO stabilizer at loadings from 0.1% to 1%.
- Characterization using optical microscopy and dynamic oscillatory rheometry.
Main Results:
- ODA-GO effectively stabilized droplet-matrix morphology, preventing drop coalescence.
- Smaller droplet sizes were observed in PI-continuous blends compared to PDMS-continuous blends.
- Flow-induced coalescence was significantly suppressed at higher ODA-GO concentrations.
- Rheology confirmed distinct interfacial relaxation processes, validating ODA-GO's compatibilizing role.
Conclusions:
- ODA-GO acts as an effective interfacial compatibilizer for immiscible PDMS/PI blends.
- The study demonstrates a strategy for tuning polymer blend morphology and properties via interfacial stabilization.
- This approach offers potential for developing specialized polymer blends for diverse applications.
