Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 5, Issue 1, Pages 1153-1164Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b02479
Keywords
Ionic liquids; Epoxy networks; Thermoplastics; Mechanical properties; Additives
Categories
Funding
- Ministere de l'Enseignement Superieur et de la Recherche (MESR)
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This work deals with the use of two types of poly(2,6-dimethy1-1,4-phenylene ether) (PPE) having different molar masses as toughening agents of epoxy/ionic liquid networks where phosphonium ionic liquids (ILs) combined with phosphinate and phosphate counteranions were used as curing agents of the epoxy prepolymer. The effect of the chemical nature of the anions on the morphology as well as the final properties of PPE-modified epoxy networks was investigated. For the same amount of PPE thermoplastic (10 p.h.r.), a morphology characterized by the presence of PPE particles as dispersed phase was observed in epoxy/amine networks whereas cocontinuous or phase-inverted morphologies were obtained for epoxy/IL networks. As a consequence, compared to PPE-modified epoxy/amine networks, a pronounced hydrophobic character and an excellent thermal stability (i.e., higher than >400 degrees C) were observed for PPE-modified epoxy/IL networks. In addition, the IL-thermoplastic combination led to significant increases in the mechanical performances of the resulting epoxy networks, especially in the stress intensity factor, K-Ic (+150% for IL-TMP and +200% for IL-DEP).
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