Wood and wood-based panels are quite typical polymer materials. The basic content of polymer chemistry and physics can be referenced and cited in the research of wood and wood-based panels.
Cellulose macromolecules are linear macromolecules, hemicellulose macromolecules are linear macromolecules with a small number of branches, and there seems to be no chemical connection between the branches. The lignin macromolecules are like a cluster of shrubs with branches and branches. Although there are chemical linkages, the probability of occurrence is very low. The lignin macromolecules and hemicellulose macromolecules often combine to form the so-called "blended polymer" structure in polymer physics. It can be seen that the configuration and conformation formed by the arrangement of the atoms of the three macromolecules of wood in space and their aggregated structure are completely consistent with the causes of the creep phenomenon we introduced earlier. Of course, the development of creep depends mainly on the magnitude of the applied force, the ratio of the intermolecular interaction energy to the thermal kinetic energy, and is also completely related to time, temperature and water content. These research results are discussed in detail in polymer physics. In a research on the creep of wood-based panels many years ago, we also found that when the relative humidity of the artificial board environment changes, the creep speed will increase, and the relative humidity is small. Whether it grows bigger or smaller, it is like this. This may be the difference between the creep laws of wood and wood-based panels and the creep of most synthetic polymers. The qualitative analysis of this phenomenon does not seem to be difficult, but it is not so easy to establish a relatively complete mathematical model. There must also be some hard work on the ground. More than 20 years ago, creep research on wood-based panels was once popular, but the prospects for developing wood-based panel products with strong creep resistance are unclear.
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