Abstract
The phase behavior for the binary mixtures of a polystyrene-block-poly(n- pentyl methacrylate) (PS-b-PnPMA) and homopolystyrenes (PS) with various molecular weights was investigated by depolarized light scattering and small-angle X-ray scattering (SAXS) as a function of PS amount. A homopolymer-free PS-b- PnPMA, prepared by a high performance liquid chromatography (HPLC) technique, showed the entirely disordered (or homogeneous) state within experimental temperature range from the glass transition temperature (Tg) to the thermal degradation temperature (Td). By adding PS to this PS-b-PnPMA, the closed-loop phase behavior was observed for the binary mixtures where no macrophase separation occurred. With increasing molecular weight (chain length) of PS, the ordered range of the closed-loop extended remarkably and a critical amount of PS increased, resulting in the conservation of only lamellar morphology up to the overall PS volume fraction (fps) of 0.70 for a PS, having a chain length ratio (α) of 2 with respect to the PS chain length of PS-b-PnPMA.
| Original language | English |
|---|---|
| Pages (from-to) | 9875-9881 |
| Number of pages | 7 |
| Journal | Macromolecules |
| Volume | 41 |
| Issue number | 24 |
| DOIs | |
| Publication status | Published - 2008 Dec 23 |
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All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Materials Chemistry
- Polymers and Plastics
- Inorganic Chemistry
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Closed-loop transition induced by homopolymers. / Eunhye, Kim; Hyungju, Ahn; Ryu, Du Yeol; Wonchul, Joo; Jin, Kon Kim; Jueun, Jung; Taihyun, Chang.
In: Macromolecules, Vol. 41, No. 24, 23.12.2008, p. 9875-9881.Research output: Contribution to journal › Article
TY - JOUR
T1 - Closed-loop transition induced by homopolymers
AU - Eunhye, Kim
AU - Hyungju, Ahn
AU - Ryu, Du Yeol
AU - Wonchul, Joo
AU - Jin, Kon Kim
AU - Jueun, Jung
AU - Taihyun, Chang
PY - 2008/12/23
Y1 - 2008/12/23
N2 - The phase behavior for the binary mixtures of a polystyrene-block-poly(n- pentyl methacrylate) (PS-b-PnPMA) and homopolystyrenes (PS) with various molecular weights was investigated by depolarized light scattering and small-angle X-ray scattering (SAXS) as a function of PS amount. A homopolymer-free PS-b- PnPMA, prepared by a high performance liquid chromatography (HPLC) technique, showed the entirely disordered (or homogeneous) state within experimental temperature range from the glass transition temperature (Tg) to the thermal degradation temperature (Td). By adding PS to this PS-b-PnPMA, the closed-loop phase behavior was observed for the binary mixtures where no macrophase separation occurred. With increasing molecular weight (chain length) of PS, the ordered range of the closed-loop extended remarkably and a critical amount of PS increased, resulting in the conservation of only lamellar morphology up to the overall PS volume fraction (fps) of 0.70 for a PS, having a chain length ratio (α) of 2 with respect to the PS chain length of PS-b-PnPMA.
AB - The phase behavior for the binary mixtures of a polystyrene-block-poly(n- pentyl methacrylate) (PS-b-PnPMA) and homopolystyrenes (PS) with various molecular weights was investigated by depolarized light scattering and small-angle X-ray scattering (SAXS) as a function of PS amount. A homopolymer-free PS-b- PnPMA, prepared by a high performance liquid chromatography (HPLC) technique, showed the entirely disordered (or homogeneous) state within experimental temperature range from the glass transition temperature (Tg) to the thermal degradation temperature (Td). By adding PS to this PS-b-PnPMA, the closed-loop phase behavior was observed for the binary mixtures where no macrophase separation occurred. With increasing molecular weight (chain length) of PS, the ordered range of the closed-loop extended remarkably and a critical amount of PS increased, resulting in the conservation of only lamellar morphology up to the overall PS volume fraction (fps) of 0.70 for a PS, having a chain length ratio (α) of 2 with respect to the PS chain length of PS-b-PnPMA.
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U2 - 10.1021/ma801530f
DO - 10.1021/ma801530f
M3 - Article
VL - 41
SP - 9875
EP - 9881
JO - Macromolecules
JF - Macromolecules
SN - 0024-9297
IS - 24
ER -