Abstract
A novel class liquid crystalline epoxy resins was synthesized by reacting the diglycidyl ether of bisphenol A (DGEBA) with three new liquid crystal diols, 4,4`-di-N-](6-hydroxy hexoxy)-3-pyridyl methylidene [amino phenyl benzamide, 4,4`- di-N-](6-hydroxy butoxy)-3-pyridyl methylidene[amino phenyl benzamide, and 4,4`- di-N-](6-hydroxy etoxy)-3-pyridyl methylidene[amino phenyl benzamide, contain azomethine groups. The new liquid crystals were characterized by Fourier transformed infra-red (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy. Flexibility and adhesion properties were then investigated for the cured resins based on new azomethine mesogenic diols. The cured polymers were found to exhibit high flexibility and good adhesion properties compared to ordinary amine systems.
Highlights
Epoxies were widely use in industrial applications such as coatings, automotive primer, printed circuit boards, semiconductor encapsulants, adhesives, and composites. epoxy resins present the attractive characteristics of excellent mechanical strength and toughness; chemical, moisture, and corrosion resistance; good thermal, high adhesive, and superior electrical properties; no volatiles emission and low shrinkage upon cure; and excellent dimensional stability
We studied the effect of a different chain length methylene groups which prepared for the curing DGEBA and discussion the mechanical properties for the cured resins
New liquid crystals that can be used as curing agents for epoxy resin (DGEBA) were successfully Prepared and characterized by means of nuclear magnetic resonance (NMR) and Fourier transformed infra-red (FT-IR) spectra
Summary
Epoxies were widely use in industrial applications such as coatings, automotive primer, printed circuit boards, semiconductor encapsulants, adhesives, and composites. epoxy resins present the attractive characteristics of excellent mechanical strength and toughness; chemical, moisture, and corrosion resistance; good thermal, high adhesive, and superior electrical properties; no volatiles emission and low shrinkage upon cure; and excellent dimensional stability. Several approaches were used in the past to control the crosslink density of an epoxy network These include varying the epoxy resin curing agent functional group ratio, using a difunctional epoxy prepolymer with a different average chain length, and varying the molecular size of the difunctional curing agent, [3,4,5]. Many compound of liquid crystalline thermosets with different mesogenic units and reactive end functional groups were prepared by Schiff bases and using in industry as curing agents for epoxies, [13,14]. Explores an efficient and economical process for preparing a new class of liquid crystals was described, where this class include Schiff bases We screen their activity as curing agents for synthesis the epoxy resins and using it in diverse applications. Anber et al.: Synthesis and Properties of New Liquid Crystals as Curing Agents for Epoxy Resins
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