Functionality and Functionality Distribution Measurements of Binder Prepolymers
作者:
AdolfH. Muenker,
BoydE. Hudson,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1969)
卷期:
Volume 3,
issue 7
页码: 1465-1483
ISSN:0022-233X
年代: 1969
DOI:10.1080/10601326908051837
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
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.
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