Study on the influential effect of different CaCO3 particle sizes on the internal pore structure of starch/fiber foaming composite materials
Shiqing Wang , Jianyong Li , Fangyi Li , Jianfeng Li , Chuanwei Zhang , Maocheng Ji , Jia Man , Sixian Peng
School of Mechanical Engineering, Shandong University
Journal：《MATERIALS TODAY COMMUNICATIONS》
Abstract：
Starch/fiber foaming material is an ideal alternative to non-degradable cushioned packaging products. There still needs to be an improvement in the performance of such materials, which affects their promotion and application. The pore structure significantly impacts the performance of starch/fiber foam composite materials, so adjusting the internal pore structure of foam materials is also an important method to improve the performance of foam materials. In this study, the CaCO with particle sizes of 50 µm,5 µm, 500 nm, and 50 nm were separately mixed into the slurry as nucleating agents and composite materials were prepared through a hot pressing process to control the pore structure by adding nucleating agents of different particle sizes. Observing through Scanning Electron Microscope(SEM), the internal pore size of the composite material with 50 µm particle size CaCO is about 800 µm. The composite material made of CaCO with a particle size of 50 nm has a pore size of only 333 µm. It has decreased by 58% compared to the composite material with 800 µm CaCO. The results indicate that as the size of CaCO particles decreases, the composite material exhibits more uniform and dense vesicles, and its water resistance, thermal stability, and corrosion resistance have also improved to a certain extent.The material made by adding the smallest particle size CaCO has a minimum degradation rate of about 10.5% in 30 days, and the buffering efficiency is highest when the stress is greater than 2 MPa, reaching about 22%.
Keywords: CaCO3Pore structure ;Comprehensive performance ;Foam composite ;Starch
Download: https://www.sciencedirect.com/science/article/pii/S2352492823025588
