Tailoring Polyamide66 Mechanical Performance: A Strategy for Condensed Phase Structure Optimization Through Hydrogen...

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Polymers like polyamide 66 (PA66) are vital in industry but often lack sufficient mechanical strength.
• Enhancing polymer mechanical performance typically involves regulating condensed phase structure.
• Molecular interactions play a critical role in determining polymer properties.

Purpose of the Study:

• To investigate the enhancement of mechanical properties in polyamide 66 (PA66) fibers.
• To explore the use of arylamide-based materials (TMB-5) during melt-spinning for property improvement.
• To understand the role of molecular interactions and structure regulation in enhancing polymer performance.

Main Methods:

• Incorporation of arylamide-based TMB-5 into polyamide 66 (PA66) during the melt-spinning process.
• Analysis of molecular reorganization, intermolecular hydrogen bonding, and chain entanglement.
• Evaluation of crystallization, molecular orientation, and lamellae orientation in the resulting PA66 fibers.

Main Results:

• TMB-5 facilitated molecular movement and reduced chain entanglement by reorganizing intermolecular hydrogen bonds in PA66.
• Synergistic effects of TMB-5 and the stretching field enhanced crystallization and molecular/lamellae orientation.
• Significant increases in tensile strength and modulus were achieved in PA66 fibers without post-drawing.

Conclusions:

• The introduction of TMB-5 provides a novel strategy for enhancing the mechanical performance of PA66.
• This method achieves improved mechanical properties through condensed phase structure regulation during melt-spinning.
• The study highlights the importance of molecular interactions in tailoring polymer properties for industrial applications.