Title: Reactive Polyetherimide Oligomers: Part II. Toughening in Epoxy Resins

Authors: Devendra Bajaj, Hengxi Chen, Dadasaheb Patil, Nikhil Verghese, Hung-Jue Sue

DOI: 10.33599/nasampe/c.22.0049

Abstract: Functionalized thermoplastics have been used to toughen epoxy resin thermosets. Compared to reactive rubbers, these toughening agents offer ease of processability, maintain a better stiffness-toughness balance and deliver superior performance at elevated temperatures. However, polyetherimide (PEI), a high temperature thermoplastic resin, in its low molecular weight, reactive form has not been widely studied as a toughening agent for epoxy resins. In this work, we studied the effects of reactive polyetherimide oligomers (rPEI) at different molecular weights (10 - 30 kDa) and loading levels (15 wt.% and 30 wt.%) in tetraglycidyl diaminodiphenylmethane (TGDDM) epoxy resin, cured with diamino diphenylsulfone (DDS). We investigated 1) glass transition temperature and reaction-induced phase separation via dynamic mechanical spectroscopy (DMS), 2) mode I fracture toughness measured via single-edge-notch three-point-bending (SEN-3PB), and 3) tensile properties. Results were compared to a commercially available functionalized polyethersulfone (PES) toughened TGDDM at similar loading levels. DMS results showed a high Tg in rPEI-toughened epoxy regardless of molecular weight and loading levels of rPEI. Higher fracture toughness was measured in rPEI-toughened epoxy vs neat TGDDM and functionalized PES-toughened epoxy. The higher toughness in rPEI-toughened epoxy did not come at the expense of modulus. In summary, we demonstrated that reactive polyetherimide oligomers offer stiffness-toughness balance and high Tg in TGDDM epoxy resin.

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Conference: CAMX 2022

Publication Date: 2022/10/17

SKU: TP22-0000000049

Pages: 10

Price: $20.00