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Manipulating the glass transition behavior of sulfonated polystyrene by functionalized nanoparticle inclusion
Sung-Kon Kim1, Ngoc A Nguyen, Jeong Jae Wie
1Department of Materials Science and Engineering and Beckman Institute, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Nanoscale
|April 25, 2015
Summary
Amine-functionalized silica nanoparticles induce a dual glass transition temperature (Tg) in sulfonated polystyrene, unlike standard silica. This unique behavior arises from nanoparticle clustering and nanoscale dispersion, affecting polymer mobility.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Nanoscale interfaces significantly influence the phase transition behaviors of polymeric materials.
- Understanding these modifications is crucial for designing advanced polymer composites.
Purpose of the Study:
- To investigate the effect of amine-functionalized silica nanoparticles on the glass transition temperature (Tg) of sulfonated polystyrene (sPS).
- To compare the behavior of amine-functionalized silica with non-functionalized silica nanoparticles in sPS composites.
Main Methods:
- Synthesis and characterization of sulfonated polystyrene (sPS) composites with 14 nm amine-functionalized silica (NH2-SiO2) nanoparticles.
- Dispersion analysis using microscopic and X-ray scattering techniques.
- Differential scanning calorimetry to determine glass transition temperatures (Tg).
Main Results:
- NH2-SiO2 inclusion resulted in a dual Tg behavior in sPS, with one Tg increased by 9.3 °C and a second Tg decreased by 44.7 °C.
- Non-functionalized SiO2 nanoparticles at identical concentrations led to a single Tg increase of 7.3 °C.
- NH2-SiO2 nanoparticles exhibited both nanoscale dispersion and micron-scale clustering, while SiO2 showed nanoscale dispersion.
Conclusions:
- The dual Tg behavior in sPS/NH2-SiO2 composites is attributed to the coexistence of nanoscale dispersion and micro-phase separation.
- Nanoconfinement and strong polymer-particle interactions increase Tg, while micro-phase separation induces a plasticization effect, reducing Tg.
