Silane and silazane surface modification of recycled glass fibers for polypropylene composites

Glass fiber (GF) composites are one of the significant challenges in recycling thermoset materials. After pyrolysis, the glass fibers lack sufficient strength and show poor matrix compatibility. Here we have investigated a series of multifunctional silane and silazane agents for surface modification...

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Bibliographic Details
Published in:Journal of applied polymer science 2023-02, Vol.140 (5), p.n/a
Main Authors: Gkaliou, Kyriaki, Daugaard, Anders E.
Format: Article
Language:English
Subjects:
Compatibility
Glass fiber reinforced plastics
interfacial adhesion
Materials science
Mechanical properties
Polymer matrix composites
Polymers
Polypropylene
Pyrolysis
recycled glass fiber
silane agents
Silanes
Synergistic effect
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Summary:Glass fiber (GF) composites are one of the significant challenges in recycling thermoset materials. After pyrolysis, the glass fibers lack sufficient strength and show poor matrix compatibility. Here we have investigated a series of multifunctional silane and silazane agents for surface modification of recycled glass fibers that provide a combination of hydrophobic properties and residual reactive groups on the surface. This allowed testing of interfacial effects from the surface modification as well as a potential synergistic compatibilization using maleated PP (MAPP). The treated GFs were used to prepare new polypropylene (PP) composites by multiple extrusion steps, resulting in a series of composites where the dispersion efficiency was attributed mainly to the surface chemistry and compatibilization effects. The amino‐silane modifications of the recycled fibers resulted in further improvements in the mechanical properties of the PP composites in comparison with the hydrophobized GFs. Moreover, synergistic effects from the addition of MAPP were observed with scanning electron microscopy. The results clearly demonstrate that the surface modifications were effective and good alternatives to currently used methods. This study investigates the efficiency of multifunctional silane and silazane agents for surface modification of recycled glass fibers. Overall, the amino‐silane reagents improve the dispersion of GFs in PP, and permit subsequent reaction with MAPP leading to better compatibilization, with moderate improvements in strength attributed to the modifications.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.53388