Determination of crosslink density by end group analysis after partial degradation: 1. Theory
| Autor: | Emory Menefee |
|---|---|
| Rok vydání: | 1981 |
| Předmět: |
Polymers and Plastics
Chemistry Organic Chemistry Intermolecular force technology industry and agriculture food and beverages Thermodynamics Fraction (chemistry) macromolecular substances End-group Distribution (mathematics) Chain (algebraic topology) Yield (chemistry) Polymer chemistry Materials Chemistry Degradation (geology) Invariant (mathematics) |
| Zdroj: | Polymer. 22:1214-1218 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/0032-3861(81)90135-x |
| Popis: | A method is derived for estimating the intermolecular crosslink density of any polymeric gel, provided it can be partially solubilized by main-chain degradative procedures to yield a soluble fraction that can be analysed for end groups. Predicted end group concentration for a given solubilization is derived from a model that assumes uniform initial chain lengths before crosslinking, random crosslink sites, and random attack on main chain bonds. Results are almost invariant with respect to chain length, so that simpler expressions can be used that are derived for infinite chain length, and which have the advantage of being applicable to gels in which the initial chain molecular weight or its distribution is unknown. |
| Databáze: | OpenAIRE |
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