http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
( Sadaf Mearaj ),( Ahmed Muhammad Ajaz ),( Joon Weon Choi ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.1
In this study soda lignin (SL) and acetylated soda lignin (ASL) were used to develop composites for food packaging applications. Both SL and ASL were mixed with PLA in different concentrations (5%, 10%, 15%, 20%, 25% and 30%) by a twin-screw extruder. PLA, PLA/SL and PLA/ASL composites were analyzed via Fourier transform infrared spectroscopy (FT-IR), SEM, tensile test, thermogravimetric analysis, UV-analysis, anti-oxidant, anti-microbial test and water contact angle (WCA). ASL reduced the size of lignin aggregates in the PLA matrix leading to improvement of tensile properties of all the PLA/ASL composites. The Tonset of ASL (296 ℃) was higher than SL (257 ℃) because of the higher thermal stability of ASL, all the PLA/ASL composites had higher Tonset than PLA/SL composites. PLA/SL10, PLA/SL15, PLA/SL20 showed UV-transmittance of less than 10% at 400nm demonstrating excellent UV-protection. The UV-transmittance of PLA/ASL composites was higher than PLA/SL composites. The result of the anti-oxidant test showed that the anti-oxidant properties of all the PLA/SL composites increased with increasing lignin content. PLA/SL10, PLA/SL15 and PLA/SL20 showed RSA (%) of around 30%, 58% and 86% respectively. This study demonstrates the potential of lignin for food packaging applications because of its excellent UV-shielding and anti-oxidant properties.
( Muhammad Ajaz Ahmed ),( Sadaf Mearaj ),( Joon Weon Choi ) 한국목재공학회 2021 한국목재공학회 학술발표논문집 Vol.2021 No.1
In this study the thermal stability of lignin-PVA composites incorporating epichlorohydrin as well as mxene has been investigated. Initially, a set of experiments was designed to screen out the most feasible soda lignin amount to be incorporated into PVA composites. Interestingly, under ambient convective cooling conditions, 10 wt.% soda lignin exhibited quite brittle and transparent characteristic features but without the addition of either any Epichlorohydrin or Mxene. However, upon the addition of Epichlorohydrin a gradual improvement in the physical features such as ductility as well as shape of the lignin-PVA composites was clearly observed. Additionally, a small amount of Mxene, etched from MAX powder, was added and there was a clear elongation and stretchable trend in the lignin-PVA-Mxene composite as compared with only lignin-PVA only composite. Finally, all the fabricated composites were subjected to thermal stability analysis. It was observed clearly that the addition of both the Epichlorohydrin and Mxene improved the thermal stability of the fabricated composites.