Fluorinated copolyimides prepared by one-shot and stepwise monomer addition method

Autor:	Byong-Wa Chun
Rok vydání:	1995
Předmět:	One shot Polymers and Plastics General Chemistry Surfaces Coatings and Films chemistry.chemical_compound Monomer chemistry Polymer chemistry Materials Chemistry Copolymer Molar mass distribution Reactivity (chemistry) Thermal stability Imide Prepolymer
Zdroj:	Journal of Applied Polymer Science. 56:567-573
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.1995.070560505
Popis:	Copolyimides containing a hexafluoropropylidene group are prepared by the stepwise monomer addition method as well as the conventional one shot method. The stepwise addition method goes through an oligomeric imide prepolymer. The molecular weight distribution of the prepolymers approximately follows the Flory's statistical distribution in the fluorinated imide prepolymer. Except for the final molecular weight, the conventional one-shot method does not give a significant difference in the copolymer character from the stepwise method, indicating that the segmental distribution in the copolyimides is practically statistical in the present monomer combination. The observed difference in the molecular weight by the preparation method may be related to the reactivity difference of the two monomer pairs. © 1995 John Wiley & Sons, Inc.
Databáze:	OpenAIRE
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