Molecular Factors Affecting the Miscibility Behavior of Cycloolefin Copolymers

Autor:	William J. MacKnight, Jacek Dudowicz, L. Charles Dickinson, Karl F. Freed, Corinne Delfolie
Rok vydání:	1999
Předmět:	Steric effects Materials science Polymers and Plastics Organic Chemistry Thermodynamics Flory–Huggins solution theory Miscibility Inorganic Chemistry chemistry.chemical_compound Monomer chemistry Polymer chemistry Materials Chemistry Copolymer Molecule Polymer blend Norbornene
Zdroj:	Macromolecules. 32:7781-7789
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma990580o
Popis:	The mutual miscibility diagram is determined for binary blends of two ethylene/norbornene random copolymers, and their monomer sequence distribution is investigated by 13C NMR spectroscopy. The miscibility changes abruptly at a norbornene content of 50% where NMR measurements indicate a change in microstructure. When both copolymers have a norbornene content higher than 50%, all blends are miscible within the composition ranges available. A simplified version of the lattice cluster theory (LCT) is applied to this system. The computations indicate that the chain stiffness (arising from the rigidity and steric interactions of the norbornene units) exerts significant influence on the miscibility of these blends. Experimental miscibility diagrams agree reasonably with the LCT predictions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ebc2487c094dd7f6c8b282f37123eff1 https://doi.org/10.1021/ma990580o Zobrazit plný text záznamu