Developing an epoxy resin with high toughness for grouting material via co-polymerization method

Abstract

In order to improve the toughness of epoxy resin for grouting material, the flexible hexamethylene diisocyanate (HDI) was utilized to manufacture a new kind of epoxy resin with high toughness via co-polymerization method. In the procedure of preparing bisphenol A epoxy resin, before the reaction between bisphenol A (BPA) and epichlorohydrin (ECH), HDI was introduced to react with BPA for embedding flexible segments into the chain of epoxy resin, then modified epoxy resin (HDI/EP) was manufactured. The mechanical properties, especially the toughness of the HDI/EP, are significantly increased – the fracture elongation is up to 124%. In addition, the compressed specimens can fully recover to their original shape in a few minutes. Thermal performance and corrosion resistance of the HDI/EP specimen were also investigated, which showed that the specimen can be used under 258°C, and can remain stable in H2SO4, NaOH and NaCl solutions with 10 wt% for 100 h, respectively. The present work provides a convenient avenue pathway to prepare an epoxy resin with high toughness, which may be used in many technologies.

Photoacoustic spectroscopy applied in the monitoring of photocuring process in epoxy diacrylate resins: Positive effect

“…Epoxy resins are synthetic and thermosetting polymers widely used in diverse fields as paints and coatings, adhesives, aerospace industry, industrial tooling, electronic materials, and biomedical systems 1–3 . The use and application of epoxy resins in different areas depend on the type of curing mechanism 4–6 and/or polymerization method required 7–9 . Among the various mechanisms, photocuring has received special attention as this mechanism belongs to the green technology 8,10–13 …”

“…[1][2][3] The use and application of epoxy resins in different areas depend on the type of curing mechanism [4][5][6] and/or polymerization method required. [7][8][9] Among the various mechanisms, photocuring has received special attention as this mechanism belongs to the green technology. 8,[10][11][12][13] Many techniques have been used to monitor the curing of epoxy resins such as Differential Scanning Calorimetry (DSC), [14][15][16] Ultrasound, [17][18][19] Fourier-transform infrared spectroscopy (FTIR), 20,21 Fluorescence, 22 and Raman spectroscopy, 23 among other techniques.…”

Synthesis and performance of flexible epoxy resin with long alkyl side chains via click reaction

“…Since the 1970s, epoxy resins have been widely used in pigments, coatings, adhesives, industrial tools, aerospace industries, electronic materials, and biomedical systems 1–3 . However, the high density, and high rigidity of the crosslinked networks formed by epoxy resins and curing agents make these materials exhibit brittleness, which greatly affects their application 4–6 . Therefore, much effort has been exerted to toughen cured epoxy resins and thereby expand their application range.…”

“…[1][2][3] However, the high density, and high rigidity of the crosslinked networks formed by epoxy resins and curing agents make these materials exhibit brittleness, which greatly affects their application. [4][5][6] Therefore, much effort has been exerted to toughen cured epoxy resins and thereby expand their application range.…”

Effects of Foaming and Drainage Behavior on Structure and Properties of Polyurethane/Water Glass (PU/WG) Grouting Materials for Coal Mines

“…Grouting materials mainly include inorganic materials (clay [13,14], water glass [15], cement [16][17][18][19][20][21][22], etc. ), organic materials (polyurethane [23,24], phenolic resin, epoxy resin [25][26][27][28], etc. ), and composite materials (polymer/cement [29][30][31], epoxy resin/cement, polyurethane/water glass [32,33], etc.…”