Ruitao Wang

With the increasing power density and integration of modern electronic devices, advanced polymeric packaging materials are required to combine efficient heat dissipation with practical processability. Conventional liquid-crystalline strategies can enhance intrinsic thermal transport through self-assembly of rigid mesogenic units into ordered molecular architectures. However, such molecular rigidity often restricts molecular mobility, increases processing temperature, and impairs processability. Therefore, achieving molecular ordering without sacrificing molecular mobility remains a critical challenge for thermally conductive epoxy resins. Based on this, we propose a synergistic molecular engineering strategy overcoming the limitations of conventional liquid-crystalline approaches. Specifically, the strategy integrates network topology regulation with charge-transfer (C-T) interactions induced intermolecular ordering. Network topology regulation creates sufficient molecular mobility for structural rearrangement, while C-T interactions further promote aromatic packing and intermolecular coupling within the reorganized network, enabling simultaneous enhancement of thermal transport and processability. The optimized epoxy resin (DOB10P2.5) achieves a high intrinsic thermal conductivity of 0.609 W·m-1·K-1 while maintaining excellent processability with a low processing temperature of approximately 100 °C and a low viscosity of approximately 15 mPa·s. This work demonstrates an alternative pathway to high-performance thermally conductive epoxy resins, providing a new molecular design principle for balancing thermal conductivity and processability in advanced polymeric packaging materials.

Silicone surfactants are increasingly used in the industrial field due to their advantages such as low surface energy, stable performance, and good biocompatibility. However, many polyether-modified silicone surfactants' foam stability and easy hydrolysis in non-neutral aqueous systems limit their application in many fields. In this article, the decynediol-ethoxylate chain segment was grafted onto heptamethyltrisiloxane to synthesize a modified trisiloxane surfactant (G2). FT-IR and ¹H NMR characterized its structure. Its surface activity, aggregation behavior, and wetting and spreading properties in water were studied by using instruments such as a surface tension meter, transmission electron microscope (TEM), dynamic light scattering (DLS), and contact angle tester. G2 can reduce the surface tension of water to 19.24 mN/m at a lower CMC (40.44 mg/L), and the foaming properties and hydrolysis stability of decynediol-ethoxylate-modified trisiloxane (G2) in water are significantly improved compared with allyl-polyoxyethylene-ether-modified trisiloxane (X5).

The adhesion and bonding performance of waterborne polyurethane (PU) coating on aluminum alloy surface was improved in this study. To achieve this objective, the effects of different sodium silicate concentrations on the aluminum alloy micro-arc oxidation (MAO) layer and the adhesion strength and corrosion resistance of MAO-PU composite coating before and after modification by MAO treatment of the 7050 aluminum alloy were studied. The experimental results showed that the modification of the MAO membrane layer by a silane coupling agent could significantly improve the adhesion strength and corrosion resistance of the composite coating. Moreover, the maximum adhesion strength was obtained when the concentration of sodium silicate was 12 g L⁻¹.