Composite material for three-dimensional (3d) printing, 3d printing method, and 3d printed part

A 3D printing filament prepared from a composite material for 3D printing, wherein the composite material comprises:

• a continuous matrix phase;
• and
• a fibrous dispersed phase distributed in the continuous matrix phase,
• wherein a material of the continuous matrix phase comprises a first crystalline polymer and a material of the fibrous dispersed phase comprises a second crystalline polymer;
• and
• a melting point of the second crystalline polymer is higher than a melting point of the first crystalline polymer.

A 3D printing method, comprising:

• heating a target 3D printing filament to a target temperature in a 3D printer, wherein the target 3D printing filament comprises a continuous matrix phase and a fibrous dispersed phase distributed in the continuous matrix phase;
• the continuous matrix phase is made of a first crystalline polymer and the fibrous dispersed phase is made of a second crystalline polymer;
• the fibrous dispersed phase has a micro-/nano-scale fibrous structure;
• a melting point of the second crystalline polymer is higher than a melting point of the first crystalline polymer;
• and the target temperature is higher than the melting point of the first crystalline polymer and lower than the melting point of the second crystalline polymer;
• and
• extruding the 3D printing filament from a nozzle of the 3D printer.

A 3D printed part, comprising a target composite material, wherein the target composite material comprises:

• a continuous matrix phase, wherein the continuous matrix phase is made of a first crystalline polymer;
• and
• a fibrous dispersed phase distributed in the continuous matrix phase, wherein the fibrous dispersed phase is made of a second crystalline polymer;
• and
• a melting point of the second crystalline polymer is higher than a melting point of the first crystalline polymer.