SYNOPSISThe elastic modulus of polyepichlorohydrin (PECH) filled with glass beads and wollastonite was studied. It was found that the elastic modulus of the composites depends not only on the volume fraction of the fillers but also on their size. Percolation theory was used to explain the experimental results. 0 1993 John Wiley & Sons, Inc.

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Faced with the presence of radiation sources in many different areas, researchers are beginning to focus on the development of personal protective equipment. The design and manufacture of lightweight, lead‐free, and flexible X‐ray shielding materials have recently become a challenge in materials science, whereas, high‐Z materials, which are essential raw materials for high‐performance X‐ray protective fillers, are non‐renewable, and their exploitation and utilization usually require long‐term planning. In this study, a new route is demonstrated to the preparation of multifunctional polymer/high‐Z material nanofibrous membrane through electrospinning and subsequent solvothermal processes. The resultant Bi2WO6/WO3/polyacrylonitrile hybrid nanofibrous membrane possesses a remarkable X‐ray attenuating property with an attenuation rate of 90.10% at 30 keV and a mass attenuation coefficient of 2.97 cm2 g−1 at 83 keV. In addition, the freestanding hybrid nanofibrous membrane also possesses excellent photocatalytic activities for the degrading of cationic water pollutants, showing promising potential in industrial wastewater treatment, and providing a new strategy for the design and applications of multifunctional and recyclable shielding materials.

Superhydrophobic electromagnetic interference (EMI) materials are becoming increasingly important to the longterm service of outdoor all-weather electrical equipment. It is an urgent need to prepare flexible and robust high-performance EMI shielding materials to work in harsh environments. To this end, we demonstrate a delicate structure design of superhydrophobic EMI shielding material that possesses desired properties via chemical deposition of silver nanocluster on electrospun polymer nanofibers followed by stearic acid (SA) modification. The porous electrospun hybrid membrane with a spatially distributed silver coating enabled excellent electrical conductivity up to 57 319 S cm −1 . Notably, superior EMI shielding effectiveness (SE) of 90.14 dB in an ultrabroadband frequency range is achieved in conjugation with the specific shielding effectiveness (SSE/t) of 14 253 dB cm 2 g −1 , owing to the combined effects of favorable porous structure and interfacial polarization. The thin coating of the SA layer endowed the film with superhydrophobicity (water contact angle up to 156.7°) and superior corrosion resistance with only 6.56% loss in EMI SE after 40 days incubation in the salt spray tank. The integrated functionalities being achieved in the hybrid membrane, such as high resistance to mechanical deformation (3.55% loss in EMI SE after 2000 times of bending), self-cleaning property, long-term (12 months) performance stability under high mechanical and chemical tolerance, offer great promise for outdoor all-weather electronic equipment under harsh environments.

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