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Phase Diagram of a Nearly Isorefractive Polyolefin Blend



Haonan Wang, Charles C. Han, K Shimizu, Erik K. Hobbie, Z G. Wang, J C. Meredith, Alamgir Karim, Eric J. Amis, B S. Hsiao, E T. Hsieh


The phase diagram of coexisting liquid-liquid phase separation (LLPS) and crystallization in nearly isorefractive blends of statistical ethylene/hexane and ethylene/butene copolymers has been investigated. A variety of techniques that exploit crystallization-induced contrast, such as photography, light scattering and transmission, atomic force microscopy and differential scanning calorimetry, are used to identify the liquid-liquid phase boundary, which is found to exhibit an upper critical solution temperature of 146 oC. The equilibrium melting temperature is suppressed in the miscible phase, whereas it remains relatively constant within the LLPS coexistence region. Measurements of the LLPS boundary can be complicated by polymer heterogeneity.
35 No. 3


atomic froce microscopy, blend, crystallization, differential scanning calorimetry, light scattering, phase diagram, phase separation, polyolefin


Wang, H. , Han, C. , Shimizu, K. , Hobbie, E. , Wang, Z. , Meredith, J. , Karim, A. , Amis, E. , Hsiao, B. and Hsieh, E. (2002), Phase Diagram of a Nearly Isorefractive Polyolefin Blend, Macromolecules, [online], (Accessed May 30, 2024)


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Created December 31, 2001, Updated October 12, 2021