Morphology and interphase formation in epoxy/PMMA/glass fiber composites

Effect of the molecular weight of the PMMA

D. Olmos, K. Bagdi, J. Mózcó, B. Pukánszky, J. González-Benito

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In this work ternary composites based on an epoxy thermoset modified with a thermoplastic polymer and reinforced with glass fibers were prepared. The aim of this study is to analyze the influence of the molecular weight of the thermoplastic polymer on the final morphologies. To obtain tailor made interphases four poly(methylmethacrylate), PMMA, which differ in their molecular weight (34,000, 65,000, 76,000 and 360,000. g/mol) were chosen to modify the epoxy resin. The amount of PMMA in the composites was fixed to 5. wt.%. Neat polymer matrices (epoxy-PMMA without fibers) were also prepared for comparison. To study all systems dynamic mechanical analysis (DMA), atomic force microscopy (AFM) and scanning electron microscopy (SEM) were used. Although all the systems showed the typical phase separation in the epoxy/PMMA blend, DMA experiments revealed a new phase with more restricted mobility when the glass fibers are present. The amount of this phase increases as molecular weight of PMMA does. The morphologies as well as the fracture surface in the immediate surroundings of the fibers were found to be different from those observed further away from the surface of the fiber, suggesting therefore that, in this case, different fracture mechanism operates. These observations allow us to conclude that an interphase with specific properties is formed. This interphase is based on a polymer or a polymer blend (epoxy-PMMA) enriched in the component with lower mobility.

Original languageEnglish
Pages (from-to)289-299
Number of pages11
JournalJournal of Colloid and Interface Science
Volume360
Issue number1
DOIs
Publication statusPublished - Aug 1 2011

Fingerprint

Polymethyl Methacrylate
Glass fibers
Molecular weight
Dynamic mechanical analysis
Thermoplastics
Fibers
Composite materials
Polymers
Thermosets
Polymer blends
Polymer matrix
Epoxy resins
Phase separation
Atomic force microscopy
Methylmethacrylate
Epoxy Resins
Scanning electron microscopy
fiberglass
Experiments

Keywords

  • Glass fiber
  • Interfacial morphology
  • Modified epoxy
  • Thermoplastic

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Colloid and Surface Chemistry

Cite this

Morphology and interphase formation in epoxy/PMMA/glass fiber composites : Effect of the molecular weight of the PMMA. / Olmos, D.; Bagdi, K.; Mózcó, J.; Pukánszky, B.; González-Benito, J.

In: Journal of Colloid and Interface Science, Vol. 360, No. 1, 01.08.2011, p. 289-299.

Research output: Contribution to journalArticle

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