Phase diagram of a nearly isorefractive polyolefin blend

Howard Wang; Katsumi Shimizu; Erik K. Hobbie; Zhi Gang Wang; J. Carson Meredith; Alamgir Karim; Eric J. Amis; Benjamin S. Hsiao; Eric T. Hsieh; Charles C. Han

doi:10.1021/ma010900f

Phase diagram of a nearly isorefractive polyolefin blend

Howard Wang
, Katsumi Shimizu
, Erik K. Hobbie
, Zhi Gang Wang
, J. Carson Meredith
, Alamgir Karim
, Eric J. Amis
, Benjamin S. Hsiao
, Eric T. Hsieh
, Charles C. Han

Chemistry

National Institute of Standards and Technology
Stony Brook University
Chevron Phillips Chemical Company LLC

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

80 Scopus citations

Abstract

The phase diagram of coexisting liquid-liquid phase separation (LLPS) and crystallization in nearly isorefractive blends of statistical ethylene/hexane (PEH) and ethylene/butene (PEB) copolymers has been investigated. A variety of techniques that exploit crystallization-induced contrast, such as diffuse light scattering, small-angle light scattering, light transmission, atomic force microscopy, and differential scanning calorimetry, are used to identify the LLPS boundary, which is found to exhibit an upper critical solution temperature of 146°C. The composition dependence of the LLPS boundary follows the prediction of Flory-Huggins theory for binary polymer mixtures. The equilibrium melting temperature of the blends decreases with increasing PEB concentration in the miscible phase, whereas it remains relatively constant at 127°C within the LLPS coexistence region. Measurements of the LLPS boundary can be complicated by heterogeneity in the polymer microstructure.

Original language	English
Pages (from-to)	1072-1078
Number of pages	7
Journal	Macromolecules
Volume	35
Issue number	3
DOIs	https://doi.org/10.1021/ma010900f
State	Published - Jan 29 2002

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10.1021/ma010900f

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title = "Phase diagram of a nearly isorefractive polyolefin blend",

abstract = "The phase diagram of coexisting liquid-liquid phase separation (LLPS) and crystallization in nearly isorefractive blends of statistical ethylene/hexane (PEH) and ethylene/butene (PEB) copolymers has been investigated. A variety of techniques that exploit crystallization-induced contrast, such as diffuse light scattering, small-angle light scattering, light transmission, atomic force microscopy, and differential scanning calorimetry, are used to identify the LLPS boundary, which is found to exhibit an upper critical solution temperature of 146°C. The composition dependence of the LLPS boundary follows the prediction of Flory-Huggins theory for binary polymer mixtures. The equilibrium melting temperature of the blends decreases with increasing PEB concentration in the miscible phase, whereas it remains relatively constant at 127°C within the LLPS coexistence region. Measurements of the LLPS boundary can be complicated by heterogeneity in the polymer microstructure.",

author = "Howard Wang and Katsumi Shimizu and Hobbie, \{Erik K.\} and Wang, \{Zhi Gang\} and Meredith, \{J. Carson\} and Alamgir Karim and Amis, \{Eric J.\} and Hsiao, \{Benjamin S.\} and Hsieh, \{Eric T.\} and Han, \{Charles C.\}",

year = "2002",

month = jan,

day = "29",

doi = "10.1021/ma010900f",

language = "English",

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TY - JOUR

T1 - Phase diagram of a nearly isorefractive polyolefin blend

AU - Wang, Howard

AU - Shimizu, Katsumi

AU - Hobbie, Erik K.

AU - Wang, Zhi Gang

AU - Meredith, J. Carson

AU - Karim, Alamgir

AU - Amis, Eric J.

AU - Hsiao, Benjamin S.

AU - Hsieh, Eric T.

AU - Han, Charles C.

PY - 2002/1/29

Y1 - 2002/1/29

N2 - The phase diagram of coexisting liquid-liquid phase separation (LLPS) and crystallization in nearly isorefractive blends of statistical ethylene/hexane (PEH) and ethylene/butene (PEB) copolymers has been investigated. A variety of techniques that exploit crystallization-induced contrast, such as diffuse light scattering, small-angle light scattering, light transmission, atomic force microscopy, and differential scanning calorimetry, are used to identify the LLPS boundary, which is found to exhibit an upper critical solution temperature of 146°C. The composition dependence of the LLPS boundary follows the prediction of Flory-Huggins theory for binary polymer mixtures. The equilibrium melting temperature of the blends decreases with increasing PEB concentration in the miscible phase, whereas it remains relatively constant at 127°C within the LLPS coexistence region. Measurements of the LLPS boundary can be complicated by heterogeneity in the polymer microstructure.

AB - The phase diagram of coexisting liquid-liquid phase separation (LLPS) and crystallization in nearly isorefractive blends of statistical ethylene/hexane (PEH) and ethylene/butene (PEB) copolymers has been investigated. A variety of techniques that exploit crystallization-induced contrast, such as diffuse light scattering, small-angle light scattering, light transmission, atomic force microscopy, and differential scanning calorimetry, are used to identify the LLPS boundary, which is found to exhibit an upper critical solution temperature of 146°C. The composition dependence of the LLPS boundary follows the prediction of Flory-Huggins theory for binary polymer mixtures. The equilibrium melting temperature of the blends decreases with increasing PEB concentration in the miscible phase, whereas it remains relatively constant at 127°C within the LLPS coexistence region. Measurements of the LLPS boundary can be complicated by heterogeneity in the polymer microstructure.

UR - https://www.scopus.com/pages/publications/0037192251

U2 - 10.1021/ma010900f

DO - 10.1021/ma010900f

M3 - Article

AN - SCOPUS:0037192251

SN - 0024-9297

VL - 35

SP - 1072

EP - 1078

JO - Macromolecules

JF - Macromolecules

IS - 3

ER -

Phase diagram of a nearly isorefractive polyolefin blend

Abstract

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