NDLI: Manipulating the glass transition behavior of sulfonated polystyrene by functionalized nanoparticle inclusion

Content Provider	Royal Society of Chemistry (RSC)
Author	Park, Ho Seok Nguyen, Ngoc A. Kim, Sung-Kon Wie, Jeong Jae
Copyright Year	2015
Abstract	Nanoscale interfaces can modify the phase transition behaviors of polymeric materials. Here, we report the double glass transition temperature (Tg) behavior of sulfonated polystyrene (sPS) by the inclusion of 14 nm amine-functionalized silica (NH2–SiO2) nanoparticles, which is different from the single Tg behaviors of neat sPS and silica (SiO2)-filled sPS. The inclusion of 20 wt% NH2–SiO2 nanoparticles results in an increase of Tg by 9.3 °C as well as revealing a second Tg reduced by 44.7 °C compared to the Tg of neat sPS. By contrast, when SiO2 nanoparticles with an identical concentration and size to NH2–SiO2 are dispersed, sPS composites possess a single Tg of 7.3 °C higher than that of the neat sPS. While a nanoscale dispersion is observed for SiO2 nanoparticles, as confirmed by microscopic and X-ray scattering analyses, NH2–SiO2 nanoparticles show the coexistence of micron-scale clustering along with a nanoscale dispersion of the individual nanoparticles. The micro-phase separation contributes to the free volume induced Tg reduction by the plasticization effect, whereas the Tg increase originates from the polymer segment mobility constrained by nanoconfinement and the rigid amorphous fractions deriving from strong polymer–particle interactions.
Starting Page	8864
Ending Page	8872
Page Count	9
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	7
Issue Number	19
Journal	Nanoscale
DOI	10.1039/c5nr01151e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Glass transition Plasticizer Dispersion relation X-ray scattering techniques Polymer Polystyrene Silicon dioxide Phase transition
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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