2results about How to "Improve shrinkage" patented technology

The application discloses a ceramic material based on cellulose nanocrystals and a preparation method thereof, and belongs to the technical field of ceramic material preparation. The aldehyde group of cellulose nanocrystals can be subjected to Schiff base reaction with the amino group in modified expanded graphite to form a three-dimensional reinforced composite network structure, so that ceramic particle sedimentation can be prevented, slurry uniformity can be ensured, viscosity can be rapidly reduced in the wet grinding process, good fluidity can be shown, high-energy mechanical shear stress generated in the grinding process can be effectively buffered and dissipated and structural integrity can be retained, the mechanical strength and fracture toughness of the green body are improved, in the high-temperature sintering stage, the cellulose nanocrystals fixed by chemical bonds can be uniformly lost, and uniform micropores are generated, local agglomeration combustion and the resulting stress concentration are avoided, warping and cracking in the sintering process are effectively inhibited, and the mechanical strength of the ceramic material is improved.

The present application relates to a kind of shell-core nanofiber membrane with temperature control shrinkage, preparation method and application;DCM and DMF are sequentially added to the mixture consisting of PTMC and PVP to obtain a mixed solution, wherein the mass percentage of solute is 2-5%; the mixed solution is stirred to obtain an electrospinning precursor solution after sufficient dissolution;After electrospinning of electrospinning precursor solution using single shaft spinneret, vacuum drying obtains nanofiber membrane, the fiber diameter of the nanofiber membrane is 0.203-0.603 μm, has shrinkage under humid conditions, and the shrinkage is enhanced with the increase of temperature, and the shrinkage rate in PBS at 20 DEG C to 37 DEG C for 2h is 20.4% to 54.33%; the nanofiber membrane adheres to wound site can effectively reduce wound area, for promoting active healing of wound, using single shaft electrospinning process preparation, it is more simple and convenient, more economical to operate.