Abstract
| Original language | English |
|---|---|
| Journal | Polymer |
| Volume | 127 |
| Pages (from-to) | 141-149 |
| ISSN | 0032-3861 |
| DOIs | |
| Publication status | Published - 2017 |
Keywords
- Core-shell nanocomposite
- Poly (methyl methacrylate)
- Nanosilica
- Glass transition
- Segmental dynamics
Cite this
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Glass transition of poly (methyl methacrylate) filled with nanosilica and core-shell structured silica. / Song, Yihu; Bu, Jing ; Zuo, Min; Gao, Yang ; Zhang, Wenjing (Angela); Zheng, Qiang.
In: Polymer, Vol. 127, 2017, p. 141-149.Research output: Contribution to journal › Journal article › Research › peer-review
TY - JOUR
T1 - Glass transition of poly (methyl methacrylate) filled with nanosilica and core-shell structured silica
AU - Song, Yihu
AU - Bu, Jing
AU - Zuo, Min
AU - Gao, Yang
AU - Zhang, Wenjing (Angela)
AU - Zheng, Qiang
PY - 2017
Y1 - 2017
N2 - Core-shell (CS) nanocomposite particles with 53.4 wt% cross-linked poly (methyl methacrylate) (PMMA) shell of 11.6 nm in thickness were fabricated via miniemulsion polymerization of methyl methacrylate in the presence of modified nanosilica. The influence of nanosilica and CS nanoparticles on glass transition and segmental dynamics of PMMA in the nanocomposites prepared via solution casting was compared. The remarkable depression (≥10 °C) of glass transition temperature (Tg) induced by the incorporation of SiO2 and CS was both observed at low loadings. Here, different mechanisms were responsible for the effect of SiO2 and CS on the segmental acceleration of PMMA matrix. The formation of rigid amorphous fraction (RAF) layer around SiO2 with the thickness of 16.4 nm led to the adjacent molecular packing frustration, while the “lubrication” effect of nonwetting interface between the grafted crosslinked chains and matrix chains resulted in the segmental acceleration and the reduction of dynamic fragility.
AB - Core-shell (CS) nanocomposite particles with 53.4 wt% cross-linked poly (methyl methacrylate) (PMMA) shell of 11.6 nm in thickness were fabricated via miniemulsion polymerization of methyl methacrylate in the presence of modified nanosilica. The influence of nanosilica and CS nanoparticles on glass transition and segmental dynamics of PMMA in the nanocomposites prepared via solution casting was compared. The remarkable depression (≥10 °C) of glass transition temperature (Tg) induced by the incorporation of SiO2 and CS was both observed at low loadings. Here, different mechanisms were responsible for the effect of SiO2 and CS on the segmental acceleration of PMMA matrix. The formation of rigid amorphous fraction (RAF) layer around SiO2 with the thickness of 16.4 nm led to the adjacent molecular packing frustration, while the “lubrication” effect of nonwetting interface between the grafted crosslinked chains and matrix chains resulted in the segmental acceleration and the reduction of dynamic fragility.
KW - Core-shell nanocomposite
KW - Poly (methyl methacrylate)
KW - Nanosilica
KW - Glass transition
KW - Segmental dynamics
U2 - 10.1016/j.polymer.2017.08.038
DO - 10.1016/j.polymer.2017.08.038
M3 - Journal article
VL - 127
SP - 141
EP - 149
JO - Polymer
JF - Polymer
SN - 0032-3861
ER -