Study of the influence of warehousing conditions on the aging durability of bamboo

Abstract

Bamboo photoaging refers to the chemical and physical changes in the surface after sunlight during outdoor/indoor use, such as texture roughness, polymer molecular chain fracture, and chemical structure changes. The study of bamboo aging during storage is an important part of the industrialization of bamboo as a substitute for plastic initiative. Photoaging during bamboo warehousing and its use is an important factor affecting performance and the use of the final product. To better evaluate the aging response mechanism caused by ambient light during bamboo warehousing, four aging conditions including ultraviolet light aging (UV-aging), indoor-light/light-avoidance cycle (Control), light avoidance (Avoid-light), and 90% RH (Avoid-light 90%) were simulated. The dimensional stability, mass, density, morphology, compressive mechanical strength, and other properties were monitored periodically according to 0, 7, 14, 28, 56, and 180 d. The change mechanism of bamboo under photoaging conditions was analyzed using SEM, FTIR, XRD, and TG. The synergistic effect of different factors under photoaging conditions was studied by redundancy analysis, and different photoaging environment prediction models were established using the long- and short-term memory (LTSM) model. The results showed that during the warehousing cycle of 180 d, the damage of light intensity to bamboo exposure was greater than that of the avoid-light treatment group, the humidity factor was negatively correlated with mechanical properties, the light factor was highly negatively correlated with dimensional stability, and the 30%–60% RH avoid-light condition showed excellent durability. The predictability of photoaging performance evaluation in a warehousing environment has important reference value for industry.