Spherical CNM-g-polyamide particles for 3D printing
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Solution Overview
Problem
In 3D printing, especially selective laser sintering, the uneven distribution of carbon nanomaterials within thermoplastic polymers leads to irregular properties and potential failure points in objects due to the lack of homogeneous dispersion of carbon nanomaterials in the polymer matrix.
Innovation Solution
The development of highly spherical carbon nanomaterial-graft-polyamide (CNM-g-polyamide) particles, which are synthesized through methods like in situ polymerization and functionalization of carbon nanotubes with polyamides, ensuring better dispersion and integration within the polymer matrix during additive manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If carbon nanomaterials are mixed with thermoplastic polymers using conventional methods, then the composite material can be produced, but the carbon nanomaterials are unevenly distributed leading to irregular properties and potential failure points
Solution Approach 1:
The patent uses grafted copolymer architecture where carbon nanomaterials are covalently bonded to polyamide chains, creating a composite structure where the nanomaterials are permanently integrated into the polymer matrix. This prevents aggregation and ensures uniform distribution throughout the printed object, directly resolving the homogeneity and reliability contradiction
Solution Approach 2:
The patent creates local functional zones by grafting carbon nanomaterials specifically at polyamide chain ends and along the backbone. This localized integration ensures that carbon nanomaterials are distributed at the molecular level throughout the polymer matrix, achieving uniform properties throughout the printed object rather than clustered distributions
2Ease of manufacture
If conventional polyamide particles are used in selective laser sintering, then the manufacturing process can proceed, but the mechanical properties and structural integrity of the printed objects are insufficient
Solution Approach 1:
The patent creates polyamide-carbon nanomaterial composite particles where the carbon nanomaterials are grafted to the polyamide chains. This composite structure maintains the processability of polyamide for selective laser sintering while simultaneously enhancing mechanical properties through the reinforcing effect of the integrated carbon nanomaterials
Solution Approach 2:
The patent modifies the molecular structure of polyamide by introducing carbon nanomaterial grafts, which changes the physical and mechanical parameters of the material. The grafted carbon nanomaterials increase strength, stiffness, and thermal stability while maintaining compatibility with the selective laser sintering process parameters
3Strength
If carbon nanomaterials are added to enhance mechanical properties, then the strength of printed objects improves, but the dispersion uniformity deteriorates leading to aggregation and irregular properties
Solution Approach 1:
The patent creates a molecular-level composite where carbon nanomaterials are covalently bonded to polyamide chains through grafting. This prevents the aggregation that typically occurs when carbon nanomaterials are simply mixed into polymers, ensuring both high strength enhancement and uniform distribution throughout the printed object
Solution Approach 2:
The polyamide chains act as intermediaries that connect and disperse carbon nanomaterials throughout the polymer matrix. The covalent bonds between polyamide and carbon nanomaterials prevent aggregation, while the flexible polymer chains ensure uniform distribution, simultaneously achieving strength enhancement and compositional stability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of CNM-g-polyamide particles results in improved mechanical properties and enhanced distribution of carbon nanomaterials within the printed objects, leading to more consistent and robust 3D printed parts with improved structural integrity.
Implementation Method 1
exposing at least a portion of the CNM-g-polyamide particles to a laser to fuse the polymer particles thereof and form a consolidated body by selective laser sintering
Implementation Method 2
cooling the mixture to below the melting point or softening temperature to form CNM-g-polyamide particles
Data Source
AI summary
A nonlimiting example method of forming highly spherical carbon nanomaterial-graft-polyamide (CNM-g-polyamide) polymer particles may comprising: mixing a mixture comprising: (a) carbon nanomaterial-graft-polyamide (CNM-g-polyamide), wherein the CNM-g-polyamide particles comprises: a polyamide grafted to a carbon nanomaterial, (b) a carrier fluid that is immiscible with the polyamide of the CNM-g-polyamide, optionally (c) a thermoplastic polymer not grafted to a CNM, and optionally (d) an emulsion stabilizer at a temperature greater than a melting point or softening temperature of the polyamide of the CNM-g-polyamide and the thermoplastic polymer, when included, and at a shear rate sufficiently high to disperse the CNM-g-polyamide in the carrier fluid; cooling the mixture to below the melting point or softening temperature to form CNM-g-polyamide particles; and separating the CNM-g-polyamide particles from the carrier fluid.