Studies On The Abnormal And Non-continuous Behavior Of Dynamic Viscoelastic Properties Of Regenerated Cellulose And Analysis By The Fourth Statistical Mechanics And Chaos Theory

Mankind is coming into 21st century, but is facing or is about to face with many new problems such as environment pollution, energy crisis, exc.. On the other hand, mankind also has many new opportunities. In order to meet new challenges, scientists are making many efforts to solve these problems. One of these solutions is to make full use of natural materials such as cellulose. Cellulose is the richest, renewable resource and it is the valuable wealth for human being. Cellulose has been widely studied and applied in broad fields such as textile, light industry, chemical engineering, national defendence, oil industry, medical industry, biological technology, energy, environment protection, life science etc.. The structure study of cellulose always is the highlight, key and difficult point in cellulose science. There are still many structural problem to be unraveled. Because cellulose structure contains a large amount of -OH group, and so a great amount of hydrogen bonds exists in its structure. Hydrogen bonding and motion introduce complexity into cellulose structure, and further bring about order or disorder in the system. Therefore, the deep research for hydrogen bonding and motion has the important meaning for structure, properties, synthesis and application of cellulose.Viscoelasticity is a very complicated problem, but it is a important and effective way to elucidate the supermolicular and fine structure of polymer. So the dynamic viscoelasticities of cellulose has been systematically investigated in this paper. For the first time, the structure and properties of cellulose fiber and film regenerated from cellulose/NaOH with steam explosion have been studied by means of dynamic viscoelastic method in this paper. The experimental results have shown that humidity has important effect on the properties and structure of cellulose. On one hand, the penetrating of water into cellulose masks off the inter- and intra- molecular hydrogen bonds in cellulose, and so promotes the motion of segments. On the other hand, by wetting process, molecule rearrangement and hydrogen-bond re-organization happen, which results in the increase of crystallinity, regularity of cellulose. Meantime, the results have the crucial effects on the structure and properties of cellulose. The fiber regenerated from cellulose/aq. NaOH solution by steam explosion(referred as to NEW) has more uniform structure, higher crystallinity, higher regularity and intra-molecular hydrogen bonding. This structure is easy to form plane-like or sheet-like structure and further, under the action of high hydrogen bonding can transform into liquid crystal structure. So NEW has high dry and wet modulus. BEN regenerated from cellulose cupprammonium solution and RAY regenerated from viscose solution have lower crystallinity, lower order, lower packing density and more defects, and so their properties are inferior to that of NEW.Also, the dynamic viscoelasticities of regenerated cellulose fibers and films over the wide...