共查询到20条相似文献，搜索用时 157 毫秒
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研究了以硝酸铈铵为引发剂,玉米淀粉接枝丙烯酰胺制备高吸水性树脂的方法。对不同的聚合条件和水解条件等因素对树脂性能的影响进行了探讨。并测定了树脂的吸水率、保水性和热稳定性。 相似文献
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20世纪60年代末高吸水性树脂发展起来。它是从1961年美国农业部北方研究所首次将淀粉接枝于丙烯腈开始发展的,碱水解的淀粉接枝共聚物具备超吸水功能,真正高吸水性树脂是源于Gugliemelli等人成功地解决了淀粉接枝丙烯腈共聚物的碱水解问题,高吸水树脂材料诞生了。但随着高吸水性树脂技术的发展与应用,人们又发现了很多吸水机理,在此基础之上大量地提高了吸水树脂的吸水能力,从而使其应用更加之广泛。 相似文献
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高岭土-聚乙烯醇高吸水性复合树脂的合成及性能研究 总被引：2，自引：0，他引：2
高吸水树脂属于新型功能高分子材料，其应用广泛．我国主要研究对象是淀粉接枝丙烯脂和丙烯酸盐系，聚乙烯醉(PVA)系高吸水树脂只有少数单位进行过研制．章采用悬浮聚合法，以顺丁烯二酸酐为交联剂，添加来源广泛、价格非常低廉的高岭土，制得了聚乙烯醇高吸水性复合树脂．该树脂的吸水倍率和吸盐水倍率分别为256和29倍．通过实验，讨论交联剂用量、高岭土添加量、水解程度等因素对吸水性能的影响．并对树脂吸水速率和保水性能进行实验． 相似文献
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微波法合成淀粉丙烯酸高吸水性树脂的研究 总被引：3，自引：0，他引：3
以N,N′-亚甲基双丙烯酰胺为交联剂、过硫酸铵为引发剂微波合成了高吸水性树脂．讨论了微波功率、聚合温度和聚合时间对吸水性能的影响．并采用红外光谱、扫描电镜等手段对传统条件下和微波条件下合成的高吸水树脂进行了结构袁征的分析．研究发现微波条件下明显耗能降低,反应时间缩短,合成工艺装置简化,且产物吸水性能普遍略高于传统制备工艺,具有良好的科研价值和应用潜力． 相似文献
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丙烯酸/甲基丙烯酸β羟乙酯共聚物耐盐性高吸水性树脂研究 总被引：3，自引：0，他引：3
以甲基丙烯酸β羟乙酯（HEMA）和丙烯酸（AA）为原料，N，N，-亚甲基双丙烯酰胺为交联剂。采用水溶液聚合法合成了耐盐性能较好的高吸水性树脂。在AA／HEMA为95／5（摩尔比），交联剂和引发剂质量分数为0．03％和0．14％，中和度为80％时，合成树脂的吸水率为570g／g，吸收1％的氯化钠溶液能力接近100g／g，在5％盐水中的吸液能力依然超过50g／g。 相似文献
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为研究腐殖酸钠高吸水性树脂对小麦幼苗生长的影响,采用水溶液聚合法合成含腐殖酸钠的丙烯酸/丙烯酰胺高吸水性树脂,并通过正交试验筛选出最高吸水倍率的配方。利用小麦种子生物测定法测定了最高吸水倍率的含腐殖酸钠的吸水树脂对小麦芽长、根长和鲜质量的作用。方差分析表明：腐殖酸钠吸水性树脂对小麦鲜质量、芽长的影响显著高于对照,但根长均表现为不显著。说明腐殖酸钠吸水性树脂对小麦生长有一定的促进作用。 相似文献
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成志良 《南通职业大学学报》1995,(1)
高吸水树脂是一种新型功能高分子材料,由于它的高吸水性,在各个领域得到了应用.并且随着应用的开发,会对它的需求量愈来愈多.(?)丙烯酸为原料,可以通过乳液聚合工艺,也可通过悬浮聚合工艺获得高吸水树脂.但这些工艺中会遇到溶剂的回收,废水的排放等诸问题.本体聚合工艺可以避免这些缺点,且获得高吸水性能的树脂.本文就本体聚合过程中的工艺条件作些探讨.一、原料及投料量丙烯酸 工业级25g 吉林化工厂北京东方化工厂氢氧化钠(片碱)工业级 12g蒸馏水 适量 引发剂 25mg交联剂 15mg以此配方可获得900～950g/g的吸水性能. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献