Study on Rheological Behavior of PEG, EVA and WSPET Modified Polypropylene Jiang Tao (Shenyang University of Technology, Liaoyang, Liaoning 111003, China) The rheological behavior of PEG, EVA and WSPET blended modified polypropylene. It was found that the blended PEG reduced the apparent viscosity of the modified polypropylene, but the extrusion enlargement phenomenon became larger. With the increase of the EVA addition amount, the apparent viscosity of the modified polypropylene first decreased and then increased; the addition of WSPET made the modified polypropylene The apparent viscosity decreased; when the addition amount was about 10%, the three modifiers all decreased the apparent viscosity of the modified polypropylene, and the influence of WSPET was the most significant.
Polypropylene fiber has the advantages of low density, high strength, good thermal insulation, chemical corrosion resistance, good electrical insulation, convenient processing and molding, etc. It has become one of the most promising synthetic fibers today. Due to the excellent properties of polypropylene fiber, it has a huge market in the three major fields of decoration, engineering and clothing. Therefore, the development of polypropylene fiber, the development of new varieties of polypropylene fiber, and the expansion of the application of polypropylene fiber are important in the world today. Research topics. However, due to the regular structure of polypropylene, the crystallinity is high, and it does not contain polar groups, so that it has dyeability, adhesion, antistatic property, hygroscopicity and compatibility with other polar polymers, inorganic fillers and metals. The adhesion is very poor, limiting the penetration of polypropylene fiber 10-09: Jiang Tao (1957-), male, associate professor of Liaoning Jinzhou.
One step to promote one 3. In order to improve the performance of perspiration, moisture permeability and other clothing, the current modification of polypropylene to obtain high hygroscopic polypropylene fiber and a high moisture absorption polypropylene is becoming a hot spot, the research direction is mainly concentrated in fine denier and super The development of fine-denier spinning technology, surface hydrophilic treatment, chemical graft modification and blending modification, among which the blending modification technology is one of the effective ways to obtain polymer materials with excellent comprehensive performance. It was found that the polypropylene fiber obtained by blending a certain amount of polar polymer such as polyethylene glycol (PEG), ethylene-vinyl acetate copolymer (EVA) and water-soluble polyester (WSPET) in polypropylene has hygroscopicity. There has been a noticeable improvement. This is because after the other components with polar groups are mixed in the PP matrix, the amorphous region is enlarged, the regularity of the PP fiber structure is destroyed, and the hygroscopicity is improved; the partially blended components are soluble in the alkali solution. Innumerable micropores are formed on the surface and inside of the fiber, and the PP fibers with micropores have good hygroscopicity; and the introduced polar groups also play a significant role in improving the hygroscopicity. The addition of the blending component which is not completely compatible with the PP matrix also causes a large change in the mechanical behavior, spinnability, and the like of the polypropylene.
In order to solve the processing problem of hygroscopic polypropylene, this paper focuses on the rheological behavior of PEG, EVA and WSPET blended modified polypropylene. Because the apparent viscosity is important for spinnability, this paper focuses on the effect of the addition of PEG, EVA and WSPET on the apparent viscosity of modified polypropylene, in order to help the research and development of high moisture absorption polypropylene.
It can be seen that the EVA modified polypropylene system n decreases with the increase of the addition temperature of D, and is the pseudoplastic fluid with the shear thinning phenomenon.
2.2.2 Effect of EVA mass fraction on n At 190,250 C, the effect of EVA mass fraction on melt n is seen in 4. From, 4, and the mass fraction of EVA has a great influence on the melt n. When EVA is added, the melt n is first lowered and then gradually added. When the EVA mass fraction is 11%, the n under each is close to the pure polypropylene, the EVA mass fraction continues to increase, n continues to increase, and the EVA mass fraction is 30%. The lower n is significantly higher than pure polypropylene. This is because EVA has a certain degree of cross-linking and can form a network through cross-linking chains. When the EVA mass fraction is low, PP encapsulates the EVA as a continuous phase, so that the viscosity of the whole system decreases; the EVA mass fraction gradually increases, and the blend of EVA and PP forms a matrix-network microfiber structure. The EVA is uniformly dispersed in the PP continuous phase. This network structure suppresses the activity of the continuous phase and makes the flow resistance of the system larger, so the viscosity of the PP/EVA system is large with the EVA mass fraction.
In general, n does not change much with the WSPET mass fraction; while at 250 °C, WSPET is completely melted, and the WSPET melt with smaller molecular mass acts like a plastic agent. Like the action of PEG, the PP melt is entangled. The junction phenomenon is reduced, the displacement unit becomes smaller, the flow resistance decreases, and n decreases; the WSPET mass fraction is large, and n is gradually decreased.
2.4 Comparison of the effects of PEG, EVA and WSPET on the blending system n. It can be seen that when the addition amount is about 10%, the addition of PEG, EVA and WSPET can reduce n, and the effect of WSPET is most significant. This is because WSPET is a mixed copolyester of benzene and meta-benzene. It has a rigid molecular chain and strong intermolecular force. It is a kind of "temperature-sensitive" polymer with elevated temperature and reduced apparent viscosity. Faster, combined with the lower molecular weight of WSPET, the molecular mass distribution and melting range are very wide, so the maximum is reduced at 250 degrees.
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