Research On Technology For Volume Elongation Preparation And Processing Of Plant Fiber/Polyoleifn Composites

The abandoned plant fiber/polymer composites are seemed as a kind of low-carbon,environmental friendly material, its application and development can not only ease the issuethat the development of polymer materials was limited for the exhausted of the oil resources,but also provide an effective path for the comprehensive utilization of the abandoned plantresources. While the composites blended by abandoned plant fiber powder and polymer, asthe powder only increase the quality, not increase the strength, which limited the space ofapplication and development. To prepare composites by using polymer and abandoned plantfiber with different length, then the polymer can be strengthened when its quality wasincreased. However, there are many technical issues need to be solved during the preparationand processing of plant fiber/polymer composites, which stimulates the high speed process ofthe preparation technique of the plant fiber and the composites. Technics, such as theshort-process, non-polluting preparation technique of abandoned plant fiber reinforcedmaterial, and efficient, low-power processing on high performance plant fiber/polymercomposites, provide powerful means for the application and development of the abandonedplant fiber/polymer composites.The vane plasticizing transportation technique, which dominated by volume elongationflow, solves the processing problem of the plant fiber and polymer, it reveals the forcedmixing mechanism during the short thermal-mechanical processing history of plant fiber andpolymer, and the generation, evolution law of the micro-structure during the processinghistory of the composites. In the vane unit, the plant fiber was forced synergistically by thematerial inflow along the axial direction and the extensional flow along the circumferentialdirection of the vane unit chamber, but with the different rotating speeds of the rotor shaft,forces that gener-ated by inflow and extensional flow are different, which makes the plantfiber present a variety of orientation distribution states in different zones of the vane unit.Based on the extensional rheology, the vane plasticizing transportation equipment presentsgood effects of mixing, distribution and dispersion, short history of thermal-mechanical,adaptability to raw materials, low power consumption and its unique processingcharacteristics of low shear, low damage on plant fiber during plasticizing transportationprocessing on plant fiber/polymer composites.By using continuous steam explosion technology, the Pipleccellollcem Clypsia Bemth(PCB) fiber was prepared from the abandoned PCB residue. Moreover, a variety of advancedtests and analysis means are used to characterize the physical and chemical properties. After the treat-ment of the steam explosion, the fiber bundles of the PCB residue are dissociatedinto more small fibers; the crystallinity increases first and decreases later, the ratio of thelength to the diameter and the specific surface area are all increase; on the fiber surface, thenumber of hydroxyl increases, the roughness increases; the content of cellulose increasesob-viously, the content of the hemicellulose decreases significantly, while the content of thelignin decreases slightly, and lignin with new structures generate.Preparing PCB fiber/polyolefin composites by using vane plasticizing transportationtechnique which based on extensional deformation, and controlling the performance of thecomposites through changing the processing technology conditions, then the correspondingrelationship between the macroscopic properties and the processing parameters was build up.The results showed that the processing technique conditions, which contain the PCB fibercontent, coupling agent content, lubricant content, antioxidant content, times of steamex-plosion treatments, processing temperature and extruding speed, had great influence on themechanical properties of the PCB fiber/polyolefin composites.The research of this paper gained innovative achievement in preparing polymercomposites, and building molding process theory. A brand new theory system of preparingpolymer composites was formed, which could solve a lot of critical technique issues thattraditional processing means not fit. This has scientific and practical significances onpromoting the sustainable development of the polymer processing industry.