Facile Fabrication of PBS/CNTs Nanocomposite Foam for Electromagnetic Interference Shielding

Abstract

In order to reduce the pollutants of environment and electromagnetic waves, environment friendly polymer foams with outstanding electromagnetic interference shielding are imminently required. In this paper, a kind of electromagnetic shielding, biodegradable nanocomposite foam was fabricated by blending poly (butylene succinate) (PBS) with carbon nanotubes (CNTs) followed by foaming with supercritical CO 2 . The crystallization temperature and melting temperature of PBS/ CNTs nanocomposites with 4 wt % of CNTs increased remarkably by 6 °C and 3.1 °C compared with that of pure PBS and a double crystal melting peak of various PBS samples appeared in DSC curves. Increasing the CNT content from 0 to 4 wt % leads to an increase of approximately 3 orders of magnitude in storage modulus and nearly 9 orders of magnitude in enhancement of electrical properties. Furthermore, CNTs endowed PBS nanocomposite foam with adjustable electromagnetic interference (EMI) shielding property, giving a specific EMI shielding effectiveness of 28.5 dB cm 3 /g. This study provides a promising methodology for preparing biodegradable, lightweight PBS/CNTs foam with outstanding electromagnetic shielding properties.

Bio-Based Poly(Imine-Amide) Materials with Dynamic Covalent Adaptable Networks: Toward Conductive Composites and Thermally Moldable Microcellular Foams

“…As shown in SEM images, some PIAs encounter difficulty in forming microcellular structures by sCO 2 physical foaming technology. Recent studies have shown that the solubility of supercritical fluids depends on the melt viscoelasticity, crystallinity, and cross-linking density of the polymer material, which affects the foam cell morphology. ,− For this study, D9C1-F and D7C3-F fail in foaming ability due to their highly linear molecular structure and/or poor viscoelasticity (vide DMA and DSC result). This is related to the crystallinity of the material at low foaming temperatures and the low degree of cross-linking at high foaming temperatures.…”

“…28,29 Polymer composite foams with conductive fillers (carbon black, carbon nanotubes, graphene, and metal-based particles) are lightweight and have good conductivity especially promising for electromagnetic interference-shielding materials with excellent shielding for electromagnetic radiation. 30,31 The formation of foam cells in the polymer allows the conductive filler to create more conductive channels, and this cellular structure increases the absorption and dissipation of electromagnetic waves. 29 To our best knowledge, only a few studies have been reported on the preparation of sustainable lightweight foams using combinations of CAN polymers and conductive composites.…”

“…Supercritical carbon dioxide (sCO 2 ) foaming technology is nontoxic, economical, eco-friendly, and feasible for commercialization. − To achieve polymer foams with a complete cellular structure and a high expansion ratio, the melt strength of the polymer is improved by introducing permanent cross-linking structures or chain extensions into the polymer matrices . However, it limits melt reprocessing and practical recycling like other thermoset polymers, for instance, thermosetting polyurethane or ethylene-vinyl acetate copolymer. ,, Therefore, combining thermoset resins with dynamic bonds and sCO 2 foaming technology could be used to produce sustainable polymer foams. , On the other hand, electromagnetic radiation is currently the most important problem in the development of communication technology that uses electromagnetic waves. , Polymer composite foams with conductive fillers (carbon black, carbon nanotubes, graphene, and metal-based particles) are lightweight and have good conductivity especially promising for electromagnetic interference-shielding materials with excellent shielding for electromagnetic radiation. , The formation of foam cells in the polymer allows the conductive filler to create more conductive channels, and this cellular structure increases the absorption and dissipation of electromagnetic waves …”

Ultralow percolation threshold biodegradable PLA/PBS/MWCNTs with segregated conductive networks for high‐performance electromagnetic interference shielding applications

“…When the MWCNTs content was 4.0 wt %, the EMI shielding effectiveness (SE) value of PBS/MWCNTs nanocomposite reached 26.00 dB. 29 Veluri et al studied the selective localization of MWCNTs and organically modified montmorillonite (O-MMT) in PBS/PLA blends. In PBS/PLA based blends, MWCNTs were predominantly distributed within the PBS phase, while O-MMT was selectively distributed in the PLA phase.…”

“…Lu et al prepared PBS/MWCNTs composite foam with a percolation threshold of 0.93 wt %. When the MWCNTs content was 4.0 wt %, the EMI shielding effectiveness (SE) value of PBS/MWCNTs nanocomposite reached 26.00 dB 29 . Veluri et al studied the selective localization of MWCNTs and organically modified montmorillonite (O‐MMT) in PBS/PLA blends.…”