Toughening of epoxy systems by brominated epoxy | Zendy

Sheinbaum Lizzie | Zendy; Sheinbaum Maria | Zendy; Weizman Orli | Zendy; Dodiuk Hanna | Zendy; Dichter Shay | Zendy; Kenig Samuel | Zendy

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Toughening of epoxy systems by brominated epoxy

Author(s) -

Sheinbaum Lizzie,

Sheinbaum Maria,

Weizman Orli,

Dodiuk Hanna,

Dichter Shay,

Kenig Samuel

Publication year - 2019

Publication title -

polymer engineering and science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.503

H-Index - 111

eISSN - 1548-2634

pISSN - 0032-3888

DOI - 10.1002/pen.24890

Subject(s) - epoxy , materials science , composite material , triethylenetetramine , ultimate tensile strength , fracture toughness , flexural strength , toughening , toughness , diamine , curing (chemistry) , izod impact strength test , flexural modulus , elongation , polymer chemistry , chemistry , organic chemistry

Blends of brominated epoxy (BE) and conventional epoxy resins were studied following curing with aliphatic triethylenetetramine (TETA), etheric (polyether diamine‐ PEA4), and aromatic (3,3′‐diamino diphenyl sulfone [DDS]) hardeners. The addition of BE resulted in an increase in T g in all tested blends. Blends with 50 wt% BE cured with TETA demonstrated an increase in flexural modulus and flexural strength, while preserving the elongation. Blends with 40 wt% BE cured with PEA4 and 50 wt% BE cured with DDS resulted in a significant enhanced tensile elongation. The shear strength of all cured systems decreased moderately with the addition of BE exhibiting a mixed mode failure. Analysis of the fracture morphology using electron microscopy supported the increase of toughness levels as a result of incorporating BE to conventional epoxy. A unique nodular and rough fracture morphology was obtained, which is related to a toughening mechanism caused by the addition of BE. It was concluded that blends of BE and conventional epoxy could be used as structural adhesives having high T g , enhanced mechanical properties and increased toughness. POLYM. ENG. SCI., 59:206–215, 2019. © 2018 Society of Plastics Engineers

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