유변학적 및 구조적 분석을 기반으로 한 아라미드 나노섬유 기반 고분자복합재 및 나노종이의 물성설계 연구

Abstract

Thermoplastic polyurethanes (TPUs) have replaced natural rubbers due to their impressive thermoprocessability, rubbery flexibility, excellent load-bearing capability, waterproofness, and high transparency. To address TPU’s drawback, such as softness and low thermal stability, they are typically prepared as composites reinforced with stiff p-aramid. While aramid nanofibers (ANFs) offer superior reinforcement superior compared to convnetional microfibers, their ability to strengthen the material depends on their loading and dispersion. Herein, we have established rheological and spectroscopic techniques for precisely controlling the reinforcing efficiency of ANF in TPU nanocomposites. Furthermore, the organo-dispersibility and positive inter-fibrillar interactions of ANFs significantly enhance the processability of p-aramid, making it easier to shape into various forms such as 1D fibers, 2D membranes and papers, and 3D foams. In particular, ANF paper (ANF-P) shows promise as an alternative to conventional electrical insulation paper, but its performance requires further optimization. This study aimed to establish an optimal nanopaper-fabrication process by using rheology-controlled suspensions to achieve remarkably strengthened pure ANF-Ps.