Li Yin,Meiling Li,Hailun Xia,Shanshan Mao,Fangyuan Gai,Hao Wang
The gas separation performance of hybrid carbon molecular sieve membranes is critically influenced by the particle size of the fillers. Herein, ZIF-8 crystals of different sizes (≈50 nm, ≈500 nm, and ≈1 µm) are used as fillers to synthesize a series of ZIF-8-derived-carbon hybrid carbon molecular sieve membranes with high filler loading. As the ZIF-8 crystal size increases from nanoscale to microscale, the CO 2 permeability of the resulting hybrid carbon molecular sieve membrane for a CO 2 /CH 4 binary mixture increases, reaching 9965 Barrer with a selectivity of 28.05. This trend highlights a clear correlation between filler size and gas separation performance of the hybrid carbon molecular sieve membranes. Microscale ZIF-8-derived-carbon offers synergistic advantages by providing abundant hierarchical pores for molecular sieving and continuous, long pathways for efficient gas transport, while preventing particle aggregation under high loading. Our finding provides valuable insights for the further development of high-performance hybrid carbon molecular sieve membranes.
Xiao Li,Yanhua Kang,Jian Chen,Zhaozhe Yang,Guomin Wu,Zhenwu Kong,Guifeng Liu,Can Jin
Bamboo fiber (BF) reinforced epoxy resin (EP) composites suffer from poor interfacial compatibility and uneven dispersion at high filler levels, restricting the further improvement of the mechanical properties of BF/EP composites. This study proposes a green and novel process for preparing composites based on an aqueous system, which enables effective dispersion of BF at high filler content and uniform integration with EP. BF is simply mixed with waterborne epoxy resin (WEP), and a hot-pressing molding process is used to prepare composite materials with high BF filler. The effects of fiber contents and resin types on the properties of the composites are investigated. At 80 wt% BF, the mechanical properties of the composite are optimized, with flexural strength and tensile strength of 124 and 53 MPa, respectively. This research provides a viable solution for the green and low-cost preparation of high-fiber-content composites, which shows great potential application in the fields of construction, automotive interiors, and sports equipment.
危险品化学品经营许可证（带存储）