Functionality and Functionality Distribution Measurements of Binder Prepolymers
- 1 November 1969
- journal article
- research article
- Published by Taylor & Francis in Journal of Macromolecular Science: Part A - Chemistry
- Vol. 3 (7), 1465-1483
- https://doi.org/10.1080/10601326908051837
Abstract
The functionality of a prepolymer, which is defined as the ratio of molecular weight to equivalent weight, is probably the most important single parameter that determines the properties of the cross-linked polymer network. The determination of prepolymer functionality therefore requires accurate knowledge of both number average molecular weight and equivalent weight. Ideally, a suitable prepolymer for propellant binder applications has terminal functionality (OH or COOH). Such a prepolymer theoretically has a functionality of 2.0. Because of uncontrolled chain termination reactions during the prepolymer synthesis, however, not all polymer chains have the desired functional end group. As a result, prepolymers generally have a distribution of functionalities, including onfunctional, monofunctional, and the desired difunctional prepolymer.Keywords
This publication has 3 references indexed in Scilit:
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- The Chemistry of Sulfonyl IsocyanatesChemical Reviews, 1965
- Kinetics of alcohol–isocyanate reactions with metal catalystsJournal of Applied Polymer Science, 1965