Surface‐Coated Thermally Expandable Microspheres with a Composite of Polydisperse Graphene Oxide Sheets

Abstract

Surface‐modified thermally expandable microcapsules (TEMs) hold potential for applications in various fields. In this work, we discussed the possible surface coating mechanism and reported the properties of TEMs coated with polyaniline (PANI) and polydisperse graphene oxide sheets (ionic liquid‐graphene oxide hybrid nanomaterial (ILs‐GO)). The surface coating of PANI/ ILs‐GO increased the corresponding particle size and its distribution range. The morphologies analyzed by scanning electron microscopy indicated that no interfacial gap was observed between the microspheres ink and substrate layer during the substrate application. The thermal properties were determined by thermogravimetric and differential thermal analyses. The addition of ILs‐GO to the polyaniline coating significantly improved the thermal expansion and thermal conductivity of the microcapsules. The evaporation of hexane present in the core of TEMs was not prevented by the coating of PANI/ ILs‐GO. The printing application of TEMs showed excellent adaptability to various flexible substrates with great 3D appearance. By incorporating a flame retardant agent into TEMs coated by PANI/ILs‐GO, finally, these TEMs also demonstrated a great flame retardant ability. We expect that these TEM‐coated PANI/ ILs‐GO are likely to have the potential to improve the functional properties for various applications.

Fabrication and magnetoelectric investigation of flexible PVDF-TrFE/cobalt ferrite nanocomposite films

“…Thermal degradation and the nucleation of the ferroelectric phases of PVDF-TrFE can be significantly impacted by the geometrical factor such as the size of the nanoparticles and the interaction at the interface between nanofillers and copolymer [42]. We use thermogravimetric analysis (TGA) to study the thermal behavior of PVDF-TrFE with the various amount of cobalt ferrite loading.…”

Construction of Excellent Visible Light Absorption Heat Storage Slurry Using Phase Change Microcapsules for Solar Thermal Utilization

“…[22] Phase change microcapsules refer to tiny "containers" with a core-shell structure that wraps phase change materials. [23][24] The microencapsulation of phase change materials provided a new method for the field of temperature regulation and energy storage, becoming a research hotspot in the field of heat storage in recent years. [25][26] Typically, those phase change microcapsules with the inorganic shell would not only enhance thermal conductivity, but also increase the noncombustibility.…”

“…Phase change microcapsules refer to tiny “containers” with a core‐shell structure that wraps phase change materials [23–24] . The microencapsulation of phase change materials provided a new method for the field of temperature regulation and energy storage, becoming a research hotspot in the field of heat storage in recent years [25–26] .…”

Gas-Generating Polymer Particles: Reducing the Decomposition Temperature of Poly(tert-Butyl Methacrylate) Side Chains Using an Encapsulated Acid Catalyst Approach

“…Gas-generating polymer particles have long been used in a wide range of industrial and consumer applications, including drug delivery and controlled release, − and for the design of thermally expandable or hollow microspheres − that can be used to light-weight or thermally insulate paper, plastics, and other composite materials. − Continued interest in this broad class of functional polymer particles has led to recent applications in oil extraction, fragrances, artificial photosynthesis, and biomedical imaging. ,− In these and other emerging applications, − the gas of interest is encapsulated within a polymeric particle and subsequently released or triggered in response to an external stimulus or other controlled conditions. Naturally, the identity and the physicochemical properties of the gas must be selected not only based on the desired application but also by the method of encapsulation and the properties of the polymeric host.…”

“…Fundamental kinetics studies suggest that the gas generation behavior of this system can be further controlled by other variables, including sample pH and the applied heating rate. These additional insights enable a further decrease in decomposition temperature to 120 °C with an onset of gas generation as low as 107 °C in dry particles, temperatures within the range required for myriad applications. − ,− …”