Effect of Blending on Molecular Weight Distribution of Polymers

Autor:	G. R. Williamson, B. Wright, R. N. Haward, G. Thackray
Rok vydání:	1965
Předmět:	chemistry.chemical_classification Materials science Polymers and Plastics Q value Dispersity High density Thermodynamics Polymer Weight range chemistry Polymer chemistry Materials Chemistry Molar mass distribution Melt flow index
Zdroj:	Rubber Chemistry and Technology. 38:539-559
ISSN:	1943-4804 0035-9475
DOI:	10.5254/1.3535674
Popis:	The effect of blending polymers of different molecular weight on the Q value (Q=Mw/Mn) of the blend has been considered. A mathematical expression is derived, and it shows by a simple application to monodisperse systems that blending over a wide molecular weight range is necessary to give high Q values. These principles are then applied to the ease of Ziegler and Phillips type high density polyethylenes having wide log-normal molecular weight distributions. In this way it is shown that only blending over a very wide melt index range, e.g., 1000/1, can be expected to have a measurable effect on Q. A series of physical measurements on blended and homogenized Ziegler polyethylenes shows no significant differences between blends and directly produced polymers.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::76680ed9d5c40e5717e32c19eb1a44ec https://doi.org/10.5254/1.3535674 Zobrazit plný text záznamu