共查询到20条相似文献,搜索用时 109 毫秒
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水溶液聚合小麦淀粉接枝丙烯酸高吸水性树脂的研究 总被引:1,自引:0,他引:1
以小麦淀粉与丙烯酸为原料,以N,N′-亚甲基双丙烯酰胺为交联剂,过硫酸铵为引发剂,采用水溶液聚合法合成高吸水性复合树脂。考察了丙烯酸的中和度、淀粉/单体比例、引发剂、交联剂等对聚合反应和树脂性能的影响。通过正交试验优选出物料的最佳配比:丙烯酸的中和度为90%,引发剂用量为0.5%,交联剂用量为0.05%,淀粉含量为10%。制备得到的吸水性复合树脂吸水率达1060g.g-1,性能优于聚丙烯酸钠高吸水性树脂。 相似文献
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采用紫外光引发聚合的方法制备淀粉-丙烯酸-丙烯酰胺高吸水性树脂,研究了淀粉用量、单体配比、丙烯酸中和度、交联剂、光引发剂等因素对吸水率的影响。当固化时间15min,淀粉用量10%(占丙烯酸用量的质量百分比).光引发剂用量0.4%,交联剂用量0.02%,中和度85%,丙烯陂/丙烯酰胺(摩尔比)10.可制得吸水率为985.1g/g的吸水树脂。 相似文献
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淀粉接枝聚合制备高吸水性树脂 总被引:1,自引:0,他引:1
以红薯淀粉为主要原料,选用丙烯酸和丙烯酰胺为改性单体,经过接枝共聚制备高吸水性树脂,分别考察单体、引发剂和交联剂用量对树脂吸水率的影响,并对树脂吸水动力学进行了初步研究.实验结果显示:当单体、引发剂和交联剂用量分别为淀粉的4倍、5%和0.8%时,高吸水性树脂吸水率最高;该树脂吸水的一级速率过程常数为0.0537min-1. 相似文献
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以丙烯酸,硅藻土为原料,过硫酸铵为引发剂,N,N’-亚甲基双丙烯酰胺为交联剂,通过接枝壳聚糖制备了壳聚糖-硅藻土-聚丙烯酸高吸水性树脂,并对高吸水性树脂的结构进行了红外光谱的表征,系统研究了引发剂、交联剂、硅藻土的用量,丙烯酸与壳聚糖的质量比,丙烯酸的中和度,反应温度以及反应时间对高吸水性树脂吸水率的影响。实验结果表明,丙烯酸与壳聚糖的质量比为12∶1,硅藻土的含量为1%,引发剂和交联剂的用量分别为2.5%和0.16%,中和度为70%,反应温度为60℃,反应时间为5.5h时,合成的壳聚糖-硅藻土-聚丙烯酸高吸水性树脂吸水(盐)率最高,分别为145g/g和30g/g。 相似文献
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玉米淀粉接枝丙烯酸高吸水性树脂的制备及性能研究 总被引:3,自引:1,他引:2
以玉米淀粉为主要原料、丙烯酸(AA)为改性单体、过硫酸铵为引发剂和N,N-亚甲基双丙烯酰胺为交联剂,采用接枝共聚法制备淀粉接枝型高吸水性树脂。研究了糊化温度、糊化时间、引发剂和交联剂用量、单体浓度、接枝反应温度和反应时间等对树脂吸水性能的影响。确定其最佳工艺条件为:糊化温度为85℃、糊化时间为60min,w(引发剂)=3%(相对于淀粉而言)、w(交联剂)=0.8%(相对于淀粉而言)、AA单体浓度为4.5mol/L、反应温度为60℃和反应时间为4h。在最佳工艺条件下制备的树脂,其吸水性能最佳,吸水率达到730g/g。 相似文献
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用一种生物相容性好、可生物降解及无毒的可再生天然高分子淀粉来制备高吸水性树脂。实验采用反相乳液法制备了淀粉/蒙脱石/丙烯酸/2-丙烯酰胺基-2-甲基丙烷磺酸四元共聚高吸水性树脂。通过单因素实验和正交试验分别讨论了引发剂、交联剂、反应温度、丙烯酸中和度和油水体积比等对高吸水性树脂溶胀性能的影响,通过FTIR和XRD表征树脂的结构,并讨论了树脂再生能力。实验结果表明:反应温度55℃,反应时间3 h引发剂用量2.0 g,交联剂用量0.04 g,丙烯酸中和度70%,油水体积为比1.2∶1,反应时间3 h,产品吸水倍率高达508 g/g。树脂经过5次循环仍能够保持较高的溶胀能力,说明该高吸水性树脂具有良好的再生性能。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献