Green recycling of aramid fiber waste as the friction modifier of POM by solid state shear milling technology

Abstract

Aramid fiber is widely used in aerospace, machinery, construction, and other fields for its high strength, high elastic modulus, lightweight, and superior comprehensive performance. However, because aramid fiber is difficult to be melted and reprocessed, efficient and environmentally friendly recycling of aramid fiber waste (AFW) is an urgent and challenging issue. In this work, we reported a facile way to recycle AFW for the preparation of friction-resistant polyoxymethylene (POM)/AFW composites. The ultrafine AFW powder with 64.69 μm in size was fabricated by solid state shear milling (S3M) technology, which broke the amide bond due to the strong compression and shearing during milling.With the increase of milling cycles, the roughness and active groups on the surface of AFW were increased, which was contributed to improving the compatibility between AFW and POM matrix. The morphology observation indicated a good dispersion of AFW in POM. The mechanical property test results showed that the flexural strength increased from 52.69 MPa to 80.12 MPa with 20 wt.% AFW. As a friction modifier, the addition of AFW could improve the tribological properties of POM/AFW composites, and the coefficient of friction (COF) and wear rate of composites with 20 wt.% AFW could decrease by 53.02% and 69.52%, respectively. The S3M technology presented in this work is an efficient and industrialized strategy for AFW recycling to prepare value-added products, which has great potential in the engineering application field.

Practicality of physical recycling method for waste polymer composites exampled via high density polyethylene/automobile shredder residue composites

“…Phase domain refers to the size of the dispersed phase (ASR particles) in the polymer matrix (HDPE). Controlling the size of the dispersed phase domain is one of the key factors to prepare the material with excellent performance in multicomponent composites 38,39 . As shown in Figure 3, ASR particles were dispersed in the HDPE matrix.…”

“…Controlling the size of the dispersed phase domain is one of the key factors to prepare the material with excellent performance in multicomponent composites. 38,39 As shown in Figure 3, ASR particles were dispersed in the HDPE matrix. The average phase domain size of ASR-10 composites is about 8.97 μm, while that of ASR-50 composites increased to 11.87 μm, an increase of about 32.33%.…”

Progress in preparation of high‐performance and multi‐functional polymer foams

“…To address this, we developed solid‐state shear milling equipment featuring a unique three‐dimensional scissor structure (Figure 7A). 70 This equipment applies a strong shear force to enable superfine pulverization of viscoelastic polymer materials and effective dispersion of inorganic functional particles at room temperature. By utilizing this specialized equipment, we successfully obtained polymer‐based micro/nano‐functional composites 71–74 .…”

“…Reproduced with permission. 70 Copyright 2022, Wiley. (B) Preparation of PVA/graphene nanocomposite foams by solid-state shear milling and scCO 2 foaming.…”

Otomotiv Sektöründe Bilyalı Mafsal Yatak Uygulamaları İçin Polioksimetilen (POM) Malzemelerin Aşınma Özelliklerinin Karşılaştırmalı Analizi

“…Hariprasad[1] gibi öncü çalışmalar, takviye oranının ve elyaf yöneliminin, polimerik kompozit malzemelerin sürtünme ve aşınma özelliklerini önemli ölçüde etkilediğini belirtmiştir. Bu bulgular, yüksek hacim oranlarının ve normal elyaf yönelimlerinin, daha düşük aşınma oranlarına yol açtığını göstermektedir.Liao ve arkadaşları[2] tarafından yapılan bir çalışmada, ortalama 64.69 μm boyutunda ultra ince atık aramid elyaf tozu (AFW) kullanılarak POM matrisi arasındaki uyumluluğun artmasına katkıda bulunmuştur. Belirlenen mekanik özellik test sonuçları, %20 ağırlık oranında AFW eklenmesiyle eğilme mukavemetinin 52.69 MPa'dan 80.12 MPa'ya arttığını göstermiştir.…”