Proposed solution for the Flory–Charlesby equation for crosslinked polymers and application for 1,2-polybutadiene crosslinked with AIBN and aryl diazide

The derivation and properties of a tractable function that approximates well the solution of the Flory–Charlesby equation for crosslinked polymers with logarithmic normal primary molecular size distribution is presented. This function gives the possibility to determine the crosslinking density, ρ, f...

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Bibliographic Details
Published in:Polymer (Guilford) 2008-10, Vol.49 (21), p.4687-4694
Main Authors: Barboiu, Virgil, Avadanei, Mihaela Iuliana
Format: Article
Language:English
Subjects:
Applied sciences
Chemical reactions and properties
Crosslinked polybutadiene
Crosslinked polymers
Crosslinking, vulcanization
Exact sciences and technology
Flory–Charlesby equation
Organic polymers
Physicochemistry of polymers
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Summary:The derivation and properties of a tractable function that approximates well the solution of the Flory–Charlesby equation for crosslinked polymers with logarithmic normal primary molecular size distribution is presented. This function gives the possibility to determine the crosslinking density, ρ, from measurements of insoluble fraction, what is the only quantitative method that can be applied for postsynthesis crosslinked polymers. Applications to 1,2-polybutadiene crosslinked with AIBN and 2,6-bis(4-azidobenzylidene)-4-methylcyclohexanone by heating allowed to obtain information about the gel point as well as about the crosslinking yield and mechanism. In addition, it was found that the temperature where the damping factor in DMA curves is maximum increases with ρ following a second order dependence. [Display omitted]
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2008.08.031