Recent studies have shown that n-C7-precipitated asphaltenes adsorb onto nanoparticles to produce iso-therms that are significantly influenced by the dispersed states of both the adsorbate and adsorbent. In the present work, we investigate this behavior further by determining the adsorption of asphaltene and resin fractions isolated from four different sources onto kaolinite using the depletion method in toluene. Treated conventionally (amount adsorbed, , ver-sus equilibrium bulk concentration, ce), adsorption isotherms for fixed initial concentrations (c0) of C5 and C7 asphaltenes and variable kaolinite mass (ms) are found to be Type I as classified by IUPAC, whereas under the same experimental conditions C5-C7 resins exhibit Type III behavior. By fixing ms and varying c0, however, Type II isotherms are produced by the resins. All the adsorption results for the same fraction type were found to be very similar, irrespective of the source. The Types I and III isotherms are described very well by the thermodynamic solid-liquid equilibrium (SLE) model of Montoya et al. (Energy Fuels 2014, 28, 4963−4975) based on association theory of Talu and Meunier (AIChE J. 1996, 42, 809-819). Individual isotherms ( versus ce) are well-fitted by a shifted Langmuir equation for asphaltenes, and by a gen-eral Freundlich (power law) relationship for resins. The SLE results verify that in toluene solution the adsorption behavior is complicated by concentration-dependent nanoaggregation of asphaltene species, whereas resin-resin interactions are weaker, but accompanied by adsorbent particle aggregation. On the other hand, when the adsorption data for each frac-tion type is re-plotted in terms of the ratio of the experimental parameter c0/ms, as originally done by Wang et al. (Col-loids Surfaces A: Physicochem. Eng. Aspects 2016, 504, 280–286), each set of data merges to a single isotherm which is rea-sonably well approximated by a Langmuir-type relationship (we term this a “pseudo-Langmuir equation”), which allows the maximum adsorption to be determined for the different adsorbate/adsorbent systems. The average maximum ad-sorbed amounts calculated in this way for each of the component types are very similar, being slightly larger for C7A compared with C5A, with the values for the C5-C7R fractions being generally lower and more variable, possibly reflecting some source dependence

Composite structures are seeing demand for higher temperature performance, and thus there is a need for advanced resin systems to meet this requirement. Here a commercial phenolic triazine (PT) resin is combined with a blend of low-viscosity difunctional cyanate ester (Primaset LECy) to achieve a series of reactive binary systems. Throughout this work, the properties of the blends are compared against an industrial standard (Primaset PT-30). The thermomechanical performances of the cured blends compare favorably with the industrial standard system with the best performing systems exhibiting T g values in excess of 300 °C, based on the drop in storage modulus (compared with a value of at least 350 °C for PT-30). After conditioning for 3127 h at 80 °C and 85% relative humidity (RH), a cured binary resin blend absorbed 4.9 wt % of moisture compared with a figure of 5.2 wt % for PT-30. When exposed to 250 °C in air continuously over a period of 3048 h, the best performing of the binary cured blends lose only 48.3% of their mass compared with 45.0% for PT-30 under the same conditions. The importance of this work is that the newly proposed resin blends containing 20−25 wt % LECy exhibit low viscosities (<1000 mPa•s) at 50 °C and are considerably more suitable for liquid composite molding processes when compared with the state-of-the-art commercial matrix, while showing improved moisture performance, with only minimal loss in thermal performance.