| Characterization of aerosolized particles from nanoclay-enabled composites during manipulation processes | 2021.07.06 | ||
|---|---|---|---|
|
저자: Eun Gyung Lee, Lorenzo Cena, Jiwoon Kwon, Ali Afshari, HaeDong Park, Gary Casuccio, Kristin Bunker, Traci Lersch, Ashley Gall, Huy Pham, Alixandra Wagner, Sushant Agarwal, Cerasela Zoica Dinu, Rakesh Gupta, Sherri A. Friend and Todd A. Stueckle (원문 바로가기) ABSTRACT Manufacturing, processing, use, and disposal of nanoclay-enabled composites potentially lead to the release of nanoclay particles from the polymer matrix in which they are embedded; however, exposures to airborne particles are poorly understood. The present study was conducted to characterize airborne particles released during sanding of nanoclay-enabled thermoplastic composites. Two types of nanoclay, Cloisite® 25A and Cloisite® 93A, were dispersed in polypropylene at 0%, 1%, and 4% loading by weight. Zirconium aluminum oxide (P100/P180 grits) and silicon carbide (P120/P320 grits) sandpapers were used to abrade composites in controlled experiments followed by real-time and offline particle analyses. Overall, sanding the virgin polypropylene with zirconium aluminum oxide sandpaper released more particles compared to silicon carbide sandpaper, with the later exhibiting similar or lower concentrations than that of polypropylene. Thus, a further investigation was performed for the samples collected using the zirconium aluminum oxide sandpaper. The 1% 25A, 1% 93A, and 4% 93A composites generated substantially higher particle number concentrations (1.3–2.6 times) and respirable mass concentrations (1.2–2.3 times) relative to the virgin polypropylene, while the 4% 25A composite produced comparable results, regardless of sandpaper type. It was observed that the majority of the inhalable particles were originated from composite materials with a significant number of protrusions of nanoclay (18–59%). These findings indicate that the percent loading and dispersion of nanoclay in the polypropylene modified the mechanical properties and thus, along with sandpaper type, affected the number of particles released during sanding, implicating the cause of potential adverse health effects. |
|||
 이전글 |
용해도에 따라 노출기준이 다른 금속화합물의 정량방법 고찰 |
|---|---|
 다음글 |
실제 3D 프린팅 작업장에서 발생하는 공기 중 유기화합물, 금속 및 입자특성 평가 |