| With the development and application of the PVA fibers modified with soybean protein (SP-PVAF), more and more problems are found out. Firstly, the relation between the internal structure and the physical and chemical property of the SP-PVAFs is unknown. Secondly, the soybean protein fiber has some problems in spinning. For example, the cohesion with the machine parts and the serious static electricity. Thirdly, in fact, the SP-PVAF is a polyvinyl copolymer with soybean protein to certain extent, so that there exist still big problem in thermal and light stability and structure and properties, as well as the relationship between structure and property of the fiber. How to explain these problems and solve them is very important. In the fabric developing, the determination of the optimized blended ratio is an urgent problem when the SP-PVAFs are blended with other fibers. In using the SP-PVAFs, the dyeing and finishing-processing must damage the fibers, so the mechanism should be analyzed. Because the research on the SP-PVAFs is simple and not perfect, the main researchers in this paper are as follows:1 The internal structure and component of SP-PVAFs: the degree of crystallization and orientation, the fibril structure and the skin-core structure have been analyzed in this paper. 2 The physical and chemical properties of SP-PVAFs: The tensile property, the relaxation property and the crimp elasticity of the SP-PVAF are discussed. In order to understand the effect of bleaching and dyeing to the SP-PVAFs, the mechanical models (including Vangheluwe model and Zeruk model) were chosen. The surface morphology, the surface friction and the wick ability of the SP-PVAFs are observed and studied. The heat endurance of SP-PVAFs is also discussed in this paper.3 . The spinning property of SP-PVAFs: the problems in spinning of SP-PVAFs and the key to solve these problems are discussed.4 The structure and strength and bending properties of the blended yarn: this part is of most important in the thesis. The tensile cures of SP-PVAFs, polyester and cotton are detected, and then the mechanical properties of blended yarns are discussed; The distribution of fibers in thecross section of the blended yarn is experimentally analyzed by the migration index and Onion index the mechanical model related to the bending rigidity has been built up, and then it be reversibly attested by the results from the experiment; the optimum blended ratio of blende yarn is determined with the multi-objective optimization method and Matlab. 5 The heat endurance and mechanical property of SPF/polyester knitted fabric: the mechanical property of SP-PVAF/polyester knitted fabric is analyzed and compared with that of the yarn under the different sorts of heat treatment; by the analysis of the strength and elongation, colour and shrinkage rate, the suitable temperature of SP-PVAF fabric ir processing and end use is determined.By this study, several effective results and conclusions have been obtained. 1 By the analysis of FTIR, the composition of SP-PVAF is the same as that of the Vinylon. The SP-PVAFs have higher degree of crystallization and lower orientation than those of Vinylon fibers. The strength and modulus in wet of the SP-PVAFs are lower than those in dry By using the scanning electron microscopy, the skin-core structure, fibril structure and isurface morphology of SP-PVAF have been characterized. The thick of skin layer is about 0.6-1 μ m. The diameter of core layer is about 5-10 μ m. The size of fibril of the SP-PVAF is about 0.5-1 μ m. The effective method to eliminate the serious static electrical phenomenon is to increase the relative humidity. In the mean time, we should pay attention to the processing problem of the flexibility and the stick-slip of the fibers. The SP-PVAFs can be dyed with acid dyes, neutral dyes and direct dyes.2 The static friction coefficient and the kinetic friction coefficient of SP-PVAFs are 0. 287 and 0. 235 respectively. The friction coefficient increases with the increase of the pressure. Because of the...
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