Estimation of molecular weight distribution parameters for free-radical polymerization

✍ Scribed by Leo Reich; S. S. Stivala

• Publisher: John Wiley and Sons
• Year: 1973
• Tongue: English
• Weight: 330 KB
• Volume: 17
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1973.070171212

✦ Synopsis

Abstract

A method is described which allows the precise estimation of molecular weight distribution parameters p and A which pertain to free‐radical polymerizations. Thus, expressions are developed which allow the estimation of (1 − p) by means of a programmable calculator using molecular weight distribution data derived from GPC. Values of A may subsequently be calculated by means of a plot of one of the expressions given. Values of (1 − p) and A obtained in this paper were checked using theoretical values as well as by a comparison between calculated and observed values. The agreement between calculated and theoretical or experimental values indicates that the method presented for the estimation of (1 − p) and A is both reliable and relatively rapid. Previously reported methods for the estimation of (1 − p) and A have involved curve‐fitting trial calculations as well as more precise interpolation procedures. However, the latter are based on single‐peak maximum values.