Main‐chain benzoxazine oligomers: Effects of molecular weight on the thermal, mechanical, and viscoelastic properties

ABSTRACT With the intent to study materials processing properties during the curing process, oligomeric benzoxazines of different molecular weight and distribution were obtained from 4‐tert‐butylphenol, bisphenol A, 4,4′‐diaminodiphenylmethane and paraformaldehyde by varying the amounts of phenolic...

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Bibliographic Details
Published in:Journal of applied polymer science 2018-09, Vol.135 (35), p.n/a
Main Authors: Ručigaj, Aleš, Štirn, Žiga, Šebenik, Urška, Krajnc, Matjaž
Format: Article
Language:English
Subjects:
Benzoxazines
Bisphenol A
Crosslinking
Curing
Liquid chromatography
Material properties
Materials processing
Materials science
Methylene dianiline
Molding (process)
Molecular chains
Molecular weight
Molecular weight distribution
Oligomers
Phenols
Polybenzoxazines
Polymers
Precursors
rheology
synthesis and processing techniques
thermosets
Viscoelasticity
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Summary:ABSTRACT With the intent to study materials processing properties during the curing process, oligomeric benzoxazines of different molecular weight and distribution were obtained from 4‐tert‐butylphenol, bisphenol A, 4,4′‐diaminodiphenylmethane and paraformaldehyde by varying the amounts of phenolic compounds. Average molecular weight and distribution of prepared mixtures of polybenzoxazine precursors were determined by gel permeation chromatography analysis. By knowing the molecular weight distribution of prepared mixtures of polybenzoxazine precursors its effect on thermal, mechanical, and viscoelastic properties of the resin during processing and polymerization could be investigated. Mixtures of polybenzoxazine precursors of higher average molecular weight and broader molecular weight distribution displayed faster curing, lower curing conversions, and higher crosslinking densities of cured resins leading to polybenzoxazines with improved properties. This investigation was oriented towards the material processing aspects with the focus on the effect of molecular weights and viscoelastic properties of starting materials on the proceeding of the curing, including changes in material properties, and sample molding. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46659.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.46659