Synthesis and Properties of a Flexible Curing Agent

Abstract

INTRODUCTION Epoxy resin contains two or more epoxy polymers composed mainly of aliphatic, alicyclic or aromatic chain segment. Epoxy resin is a useful thermosetting product for polymer oligomer formation by the reaction of epoxy groups with liquid and exclusion of thick and solid-state varieties, among other forms. Although most of types of epoxy resins are utilized at room temperature, the liquid itself is a thermoplastic linear polymer. It almost did not separate the use of value at room temperature or heated conditions, the epoxy oligomers and curing agent reactions cross-linked into three-dimensional network structure of insoluble and infusible polymer. its inherent excellent performance. Epoxy resin is most commonly used in the aerospace, aviation and defense sectors as a thermosetting polymer due to its strong bonding ability, excellent electrical insulating, processing and chemical properties and good stability. It is widely used in coatings, adhesives, electrical and electronic devices, wood construction, composite materials and many other fields 1-3. Cured pure epoxy resin has high crosslinking density thus, it is brittle, fatigue-resistant, heat-resistant and has impact toughness. However, it also presents several disadvantages, including failure to meet requirements and the fact that epoxy application is subject to certain restrictions. As such, many studies hava sought to determin methods by which modification of the toughness epoxy resin could be achieved 4-7. EXPERIMENTAL The materials used in the experiment are presented in Table-1.

Synthesis, characterization, and shape-memory performances of monoamine-toughened epoxy resin

“…The primary method is to use the curing agents that have flexible chain segments. [23][24][25][26] The introduction of the soft segment in the system increases the movement of the molecular chain to achieve toughening effect.…”