Isomeric effects on the phase behavior of polystyrene- block -poly(pentyl methacrylate) copolymers

Hong Chul Moon; Jong Gyun Kim; Jin Kon Kim

doi:10.1021/ma3003449

Isomeric effects on the phase behavior of polystyrene- block -poly(pentyl methacrylate) copolymers

Hong Chul Moon, Jong Gyun Kim, Jin Kon Kim

Department of Chemical Engineering

Pohang University of Science and Technology

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Isomeric effects on the phase behavior of Polystyrene-blockpoly(pentyl methacrylate) copolymers were studied. Results show that when the molecular weight was judiciously controlled, PS-b-PneoPMA shows the closedloop type phase behavior similar to PS-b-PnPMA. PS-b-PneoPMA-H shows a precipitous drop in the birefringence signal at approx 278°C. The closed-loop phase behavior of PS-b-PneoPMA shows that at 162.5°C, the peak became sharp and narrow. A plot of inverse maximum intensity of SAXS profiles versus inverse temperature indicates temporal changes of storage modulus G' of PS-b-PneoPMA-B3. The molecular weight dependence of transition temperatures for PS-b-PisoPMA and PS-b-PneoPMA shows different molecular geometries of pentyl methacrylate block. The free volume for PneoPMA is larger than that for PnPMA because of the bulkier neopentyl chains compared with linear shape of n-pentyl chains.

Original language	English
Pages (from-to)	3639-3643
Number of pages	5
Journal	Macromolecules
Volume	45
Issue number	8
DOIs	https://doi.org/10.1021/ma3003449
State	Published - 24 Apr 2012

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title = "Isomeric effects on the phase behavior of polystyrene- block -poly(pentyl methacrylate) copolymers",

abstract = "Isomeric effects on the phase behavior of Polystyrene-blockpoly(pentyl methacrylate) copolymers were studied. Results show that when the molecular weight was judiciously controlled, PS-b-PneoPMA shows the closedloop type phase behavior similar to PS-b-PnPMA. PS-b-PneoPMA-H shows a precipitous drop in the birefringence signal at approx 278°C. The closed-loop phase behavior of PS-b-PneoPMA shows that at 162.5°C, the peak became sharp and narrow. A plot of inverse maximum intensity of SAXS profiles versus inverse temperature indicates temporal changes of storage modulus G' of PS-b-PneoPMA-B3. The molecular weight dependence of transition temperatures for PS-b-PisoPMA and PS-b-PneoPMA shows different molecular geometries of pentyl methacrylate block. The free volume for PneoPMA is larger than that for PnPMA because of the bulkier neopentyl chains compared with linear shape of n-pentyl chains.",

author = "Moon, {Hong Chul} and Kim, {Jong Gyun} and Kim, {Jin Kon}",

year = "2012",

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T1 - Isomeric effects on the phase behavior of polystyrene- block -poly(pentyl methacrylate) copolymers

AU - Moon, Hong Chul

AU - Kim, Jong Gyun

AU - Kim, Jin Kon

PY - 2012/4/24

Y1 - 2012/4/24

N2 - Isomeric effects on the phase behavior of Polystyrene-blockpoly(pentyl methacrylate) copolymers were studied. Results show that when the molecular weight was judiciously controlled, PS-b-PneoPMA shows the closedloop type phase behavior similar to PS-b-PnPMA. PS-b-PneoPMA-H shows a precipitous drop in the birefringence signal at approx 278°C. The closed-loop phase behavior of PS-b-PneoPMA shows that at 162.5°C, the peak became sharp and narrow. A plot of inverse maximum intensity of SAXS profiles versus inverse temperature indicates temporal changes of storage modulus G' of PS-b-PneoPMA-B3. The molecular weight dependence of transition temperatures for PS-b-PisoPMA and PS-b-PneoPMA shows different molecular geometries of pentyl methacrylate block. The free volume for PneoPMA is larger than that for PnPMA because of the bulkier neopentyl chains compared with linear shape of n-pentyl chains.

AB - Isomeric effects on the phase behavior of Polystyrene-blockpoly(pentyl methacrylate) copolymers were studied. Results show that when the molecular weight was judiciously controlled, PS-b-PneoPMA shows the closedloop type phase behavior similar to PS-b-PnPMA. PS-b-PneoPMA-H shows a precipitous drop in the birefringence signal at approx 278°C. The closed-loop phase behavior of PS-b-PneoPMA shows that at 162.5°C, the peak became sharp and narrow. A plot of inverse maximum intensity of SAXS profiles versus inverse temperature indicates temporal changes of storage modulus G' of PS-b-PneoPMA-B3. The molecular weight dependence of transition temperatures for PS-b-PisoPMA and PS-b-PneoPMA shows different molecular geometries of pentyl methacrylate block. The free volume for PneoPMA is larger than that for PnPMA because of the bulkier neopentyl chains compared with linear shape of n-pentyl chains.

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JF - Macromolecules

IS - 8

ER -

Isomeric effects on the phase behavior of polystyrene- block -poly(pentyl methacrylate) copolymers

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