▎ 摘　　要

NOVELTY - Composite material comprises 2-10 g polydimethylsiloxane (PDMS) precursor, 8-16 g pore-forming agent, 0.02-0.1 g carbon-based conductive additive, and 0.4-2.0 g piezoelectric material. The composite material further comprises 0.2-1 g conductive polymer, 2.5 g surfactant, and 5 wt.% carbon nanotube (CNT) aqueous dispersion. The pore forming agent is potassium salt, sodium salt, ammonium salt or nitrate. USE - Composite material for PDMS-based flexible pressure sensor used in field of wearable electronic device and man-machine interaction device for health monitoring, human body movement state monitoring and human body rehabilitation training. ADVANTAGE - The composite material satisfies with simple technique, short response time, high sensitivity, and high reliability, and can adjust the hole structure and material proportion to realize the effective control of the performance, flexibly changing array design, suitable for health monitoring, human body movement state monitoring, and human body rehabilitation training, and so man-machine interaction, which greatly promotes the existing technology. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparation process of the composite material comprises (i) taking PDMS precursor and curing agent, stirring for 5-10 minutes, and let it stand to eliminate bubbles, introducing pore-forming agent, stirring for 5-10 minutes, pouring into the mold and solidify at 80℃, washing and soaking with deionized water, heating in a water bath for 10-30 minutes after demolding, dispersing with ultrasound for 5-15 minutes, and repeating the deionized water wash several times until the gel is completely free of solid particles, drying at 80℃, and cutting into a preset size with a thickness of 0.1-1 mm of PDMS aerogel. (ii) carbon-based conductive additives, piezoelectric materials, conductive polymers, and surfactants, and add deionized water. Disperse with ultrasound for 5-15 minutes at room temperature, stirring with magnetic stirring for 30-60 minutes, introducing 5 wt.% carbon nanotube aqueous dispersion, disperse with ultrasound for 5-15 minutes, stirring with magnetic stirring for 30-60 minutes to obtain the conductive material dispersion, (iii) dispersing the conductive material dispersion with ultrasound for 5-15 minutes, immersing the PDMS aerogel in the conductive material dispersion, squeezing and immerse repeatedly until the whole body turns black, soaking for 1-2 hours, and drying at 80℃ to obtain the composite material.