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生物聚合物国会2018:天然单宁:潜在的应用在塑料-晶晶廖大学德洛林

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本研究提出了一种polypropylene-based复合处理单宁树脂,它是一个环保性能优良的热固性树脂,通过动态挤压方法与当前的马来酸酐接枝聚丙烯(MA-g-PP)作为增容剂。单宁树脂含量对形态的影响,机械、热、流变特性进行调查。单宁树脂成功分散到PP基体和增强聚丙烯矩阵。观察到的形态、光学显微镜和扫描电子显微镜(SEM),证实,单宁树脂分散在PP基体为微粒直径范围5-45μm。复合材料的力学性能,研究了拉伸和冲击试验,展示优秀的杨氏模量的增加单宁树脂含量,而负面影响可以在拉伸和影响的优点。获得的数据动态分析(DMTA)和差示扫描量热法(DSC)表明,单宁树脂略影响玻璃化转变和熔点。然而,低单宁树脂含量增加PP基体的结晶。根据热重分析(TGA)分析,单宁树脂增强聚丙烯的热稳定性。融化的流变数据表明,复杂的粘度,储能模量(G),损耗模量(G”)随着单宁树脂含量除了30%单宁树脂。此外,单宁树脂有能力阻碍PP聚合物链的分解。 Recently, poly(lactic acid) /tannins composite filament has been successful used to 3D printing. Tannin, also called tannic acid, is a part of a group of pale yellow to light brown amorphous substances in the form of powder, flakes or a spongy mass, widely distributed in plants and used in tanning of cu la fabric dyeing, ink making and various medical applications. The tannin solutions are acidic and have an astringent taste. The tannin is responsible for the astringency, color and flavor of the tea. Tannins are commonly found in the roots, wood, bark, leaves and fruits of many plants, especially in the bark of oak species and in sumac and myrobalan. They also occur in galls, insect attacks from pathological growths. In addition to the application of the manufacturer and dyeing of leather, tannins are used in the clarification of wine and beer, as well as in the viscosity of the drilling mud for oil constituents, and in the boiler water to prevent scale formation. Tannin has been utilized in treating tonsillitis, pharyngitis, hemorrhoids and rashes due to its styptic and astringent properties. Soluble in water, the tannins form of dark blue or dark green solutions with iron salts, a property used in the manufacture of many applications. Coagulation is essential for the treatment of surface water and industrial wastewater. This is a well-known process in which the aggregation of colloids and other suspended substances is the promoter and the larger flakes. Usually, the coagulants used are derived from inorganic compounds such as ferric chloride (FeCl3) or aluminum sulfate (Al2 (SO4) 3). However, researchers are looking for new and natural sources of coagulants, usually from plant extracts. Plant based representation of coagulants is an alternative to those based on inorganic metals, which are beneficial because they allow for the production of biodegradable sludge The use of natural tannins has also been optimized by mixing them with other reagents. This is the case for tannins extracted from Acacia mearnsii from Wild which have been combined with NH4Cl and formaldehyde for water purification and wastewater treatment. This mixture has proven to be a useful tool for avoiding pollution by surfactants and dyes from wastewater. The cationic coagulants for the variable parameters were the temperature and the tannin-NH4Cl ratio, the latter being more influential than the former. The optimal parameters were found at 2 g / g using 25% C for the removal of dyes and 36 ° C for the removal surfactants. Finally, the last step is to apply this configuration to a combined and optimized coagulant in a natural environment. This final approach was tested on dye and surfactant.

晶晶廖

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