Morphology and thermal/mechanical properties of alkyl‐imidazolium‐treated rectorite/epoxy nanocomposites

Abstract

A novel organic rectorite (OREC) was prepared by treating the natural sodium-rectorite (Na-REC) with ionic liquid 1-hexadecyl-3-methylimidazolium bromide ([C 16 mim]Br). X-ray diffraction (XRD) analysis showed that the interlayer spacing of the OREC was expanded from 2.23nm to 3.14nm. Furthermore, two types of OREC/epoxy nanocomposites were prepared by using epoxy resin (EP) as matrix, 2-ethyl-4-methylimidazole (2-E-4-MI) and tung oil anhydride (TOA) as curing agents, respectively. XRD and transmission electron microscope (TEM) analysis showed that the intercalated nanocomposite was obtained with addition of the curing agent 2-E-4-MI, and the exfoliated nanocomposite was obtained with addition of the curing agent TOA when the OREC content was less than 2 wt %. For the exfoliated nanocomposite, the mechanical and thermal property tests indicated that it had the highest improvement when OREC content was 2 wt% in EP. Compared to pure EP, 60.3% improvement in tensile strength, 26.7% improvement in bending strength, 34% improvement in bending modulus, 14 C improvement in thermal decomposition temperature (T d ) and 5.7 C improvement in glass transition temperature (T g ) were achieved. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: [1572][1573][1574][1575][1576][1577][1578][1579] 2012

A renewable tung oil-derived nitrile rubber and its potential use in epoxy-toughening modifiers

“…By the Diels-Alder reaction, a number of tung oil-derived toughened epoxy resins have been produced. [21][22][23][24] As is well-known, the products obtained via the Diels-Alder reaction contain a ring structure, which may reduce the toughening effect. Hence, to avoid the formation of a ring structure, an alternative strategy is to synthesize the tung oilbased toughener via radical polymerization; however, only few studies have been reported on the synthesis of an epoxy resin toughener by the radical polymerization of tung oil or tung oilderives.…”

Self-healing of abrasion damage on epoxy resin controlled by ionic liquid

“…1 Since the rst report 2 on the hardening effect of a tetra-uoroborate imidazolim IL on epoxy resin, different research groups have focused their attention in such aspects as the use of ILs as catalysts of the crosslinking process, [3][4][5][6][7][8][9] as curing agents, [10][11][12][13][14][15] as dispersants of nanophases, [16][17][18][19][20][21][22] and as modiers of thermal, rheological or mechanical properties. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] As the poor tribological performance of epoxy resins is a major limitation in many structural applications, our research group has examined the effect of the addition of less than 3 wt% concentration of ILs 23 or IL-modied nanophases 18,22,25 on the improvement of the tribological performance of epoxy resin cured with a conventional amine hardener. In this line, we have very recently described the rst self-healing effect of abrasion surface damage on an epoxy resin material by the addition of a relatively hi...…”

Conductive Network Enhanced Carbon Black/Epoxy Composite Coating with Imide Curing for Antistatic and Heat-Resistance Improvement

“…The common methods to improve the heat resistance of EPs include introduction of heat-resistant groups or rigid groups into the molecular structure of epoxy, use heatresistant curing agent, and use heat-resistant additives to reduce the free volume of epoxy curing material and improve the heat resistance of epoxy resin [17,18,19,20,21]. For example, the EPs containing epoxy-functionalized tung oil structure and primary diamine hardener decompose only at temperature higher than 360 °C, and the EPs containing waterborne polyamide salt solution decompose only at temperature higher than 403 °C [22,23]. Besides, the coating of stealth high-speed aircraft needs conductivity to achieve electromagnetic shielding effect [24,25,26,27,28].…”