Bionic micro‐interface lattice foam‐core composites: Manufacturing techniques, compression resistance, bursting strength, low‐velocity impact, and dynamic cushion efficacy

Abstract

This study proposes a high-resilience foam-core composite with bionic micro-interface lattice structure using columnar lattice mold and two-step foaming technique. This foam-core composite uses polyamides nonwoven fabrics as the bionic surface layers and polyurethane foam as the bionic core layer. The foam cavity diameter and columnar interface area are adjusted by the polyols content and the column diameter, respectively. Effects of the cavity diameter and the column diameter on the compression resistance, static-bursting strength, low-velocity impact, and dynamic cushion efficacy of foam-core composites are investigated. The results show that compression resistance, bursting strength, and cushion efficacy of the foam-core composites are all increased by degrees with the cavity diameter when the content of polyols increases.When the cavity diameter was 195 μm, bionic micro-interface foam-core composite absorbed 99% low-velocity impact energy. Existence of bionic micro-interface lattice obviously improved the static compression and bursting properties. Bionic microinterface foam-core composites with 16 mm-diameter column have the lower and wider contact force peak compared to pomelo, 8 mm and 12 mm-diameter column, indicating higher dynamic cushion efficacy. The resulted composite provides an idea of establishing bionic foam-core cushion composites by foam interface, which is expected to be used as energy absorption material for commercial application.

Reducing High-Molecular-Weight Oligomers in Biobased Pentamethylene Diisocyanate Trimers

“…The basic building block of PU is the carbamate group, which is formed through the additional polymerization of isocyanates with diols or polyols . Owing to their excellent wear resistance, toughness, mechanical strength, corrosion resistance, and processability, − they are widely employed in various fields, including coatings, , adhesives, , fibers, , thermoplastics, , thermosetting materials, , biomimetic materials, , and nanocomposites. , Commonly used polyisocyanates include aromatic and aliphatic isocyanates, such as toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), and hexamethylene diisocyanate (HDI), which are derived from fossil feedstocks. − However, with the increasing global demand for PU, traditional polyisocyanates are facing challenges caused by decreasing fossil resources and increasing environmental pollution. New biobased isocyanates have attracted widespread attention from researchers and industries because of their high biochar content.…”

“…1 The basic building block of PU is the carbamate group, which is formed through the additional polymerization of isocyanates with diols or polyols. 2 Owing to their excellent wear resistance, toughness, mechanical strength, corrosion resistance, and processability, 3−7 they are widely employed in various fields, including coatings, 8,9 adhesives, 10,11 fibers, 12,13 thermoplastics, 14,15 thermosetting materials, 16,17 biomimetic materials, 18,19 and nanocomposites. 20,21 Commonly used polyisocyanates include aromatic and aliphatic isocyanates, such as toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), and hexamethylene diisocyanate (HDI), which are derived from fossil feedstocks.…”

Effects of polymethacrylimide foam reinforced aluminum honeycomb sandwich under quasi‐static compression

“…They discovered that the mechanical properties were significantly better than those of conventional honeycomb sandwich. Han et al, 15 Jiang et al, 16 Russell et al, 17 Fan et al, 18–21 Chen et al, 22 Niu et al, 23 Xu et al, 24 Azarafza, 25 Huybrechts et al, 26 Shibhate et al, 27 Lin et al, 28 Li et al, 29 designed and processed different types of honeycomb sandwich structures such as sandwiches. The performance of various honeycomb sandwich structures, including the CFRC square honeycomb sandwich and the Kagome honeycomb sandwich, was investigated using experiments.…”