Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Morphological Developement in Copolymer Blends of Poly (Ethylene-Co-Hexene) and Poly (Ethylene-Co-Butene)

Published

Author(s)

K Shimizu, Haonan Wang, Z G. Wang, H D. Kim, Charles C. Han

Abstract

In order to understand the liquid-liquid phase separation and crystallization in copolymer blends of PEH and PEB, the transmitted optical microscopy was employed to observe the morphological development with the normal quench and double quench measurements. In the normal quench measurement, the spherulites were observed and the spherulitic growth rates in PEH, H90 and H50 were obtained. However the liquid-liquid phase separation could not be observed in this measurement. These results suggest that the blends are ease to crystallize at the isothermal crystallization temperature and it is difficult to observe the liquid-liquid phase separation due to the similarity of the refractive indices between PEH and PEB components. In the double quench measurement, both the interconnected bicontinuous structure and spherulites can be observed. The size of the interconnected bicontinuous tubes was increased with time. The results show that the liquid-liquid phase separation can be observed in the nearly isorefractive PEH/PEB blends and the morphology in the blends can be controlled by adjusting the sample temperatures.
Citation
Journal of the American Chemical Society
Volume
223

Keywords

crystallization, growth rate, liquid-liquid phase separation, optical microscopy, Poly(ethylene-co-butene), Poly(ethylene-co-hexene

Citation

Shimizu, K. , Wang, H. , Wang, Z. , Kim, H. and Han, C. (2002), Morphological Developement in Copolymer Blends of Poly (Ethylene-Co-Hexene) and Poly (Ethylene-Co-Butene), Journal of the American Chemical Society (Accessed June 18, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created April 1, 2002, Updated February 17, 2017