Relationship between the lateral surface free energy .sigma. and the chain structure of melt-crystallized polymers

Autor:	Herve Marand, John D. Hoffman, Robert L. Miller, Daniel B. Roitman
Rok vydání:	1992
Předmět:	chemistry.chemical_classification Polymers and Plastics Lateral surface Chemistry Stereochemistry Organic Chemistry Nucleation Thermodynamics Sigma Polymer Inorganic Chemistry Chain (algebraic topology) Materials Chemistry Growth rate Connection (algebraic framework) Constant (mathematics)
Zdroj:	Macromolecules. 25:2221-2229
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma00034a025
Popis:	A theory is presented for the lateral surface free energy parameter σ in the nucleation constant K g in the relation G exp[-K g /T(ΔT)f] that describes the growth rate of polymer crystals from the melt at low-to-moderate undercoolings ΔT. The theory forms a connection between nucleation theory and the statistics of polymer chain dimensions and provides a new approach to the determination of the characteristic ratio C ∞. It is predicted that σ varies as constxC ∞ -1 , where the constant involves known quantities. The effect of chain structure resides principally in C ∞
Databáze:	OpenAIRE
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