共查询到20条相似文献，搜索用时 234 毫秒
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借助相关文献中纳米材料改性聚合物的方法,利用不同质量分数的纳米材料对聚合物进行改性,并采用关联度分析法研究了纳米粉体的掺量与改性聚合物性能间的关系.结果表明纳米材料的加入显著改善了沥青聚合物的低温性能、高温性能及综合路用性能.分析的结果与实验基本一致,进而可以指导改性聚合物的制备. 相似文献
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环氧树脂的共混改性研究进展 总被引：4，自引：0，他引：4
综述了环氧树脂共混改性的主要方法及最新进展,对环氧树脂互穿网络聚合物IPN和热致液晶聚合物(TLCP)改性环氧树脂的前景进行了分析。 相似文献
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膜污染的问题正限制着膜技术的进一步扩大应用,而两性离子聚合物具有亲水基团,能高度水化从而阻抗非特异性蛋白的吸附,因此,通过接枝改性技术将两性离子引入到膜材料中,制备耐污染性膜具有重要的研究意义.该文综述了两性离子聚合物在超滤膜领域的应用进展,对膜改性方法进行了分类,并展望了其应用前景. 相似文献
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聚合物水泥是一种常用的建筑材料,采用聚合物水泥对有机材质滤料进行包覆改性,通过对其表面性能的改善,进而增强有机滤料的亲水性以及生物亲和性。实验结果表明,聚合物水泥基滤料在机械特性、水力学特性及生物学方面都占有优势,这种滤料制造工艺简单,费用低,原料来源广,节能环保,在污水处理领域中具有很广阔的发展潜力。 相似文献
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聚合物与水泥进行合理、有效地复合,开发聚合物水泥基复合材料,是研制高效节能建材的有效途径之一。通过研究不同玻璃化温度、不同pH值的聚合物对水泥基复合材料抗压、抗折强度的影响,得出玻璃化温度存在一个最佳值,碱性的聚合物改性水泥砂浆的力学性能最高。 相似文献
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塑料新材料的发展从研制树脂新品种转向对原有树脂的改性方向,特别在制备高质量、高性能、功能化聚合物方面发展迅速。介绍了塑料新材料:聚合物合金,聚合物复合村料,液晶聚合物材料,聚合物纳米材料等新型塑料材料的性能、品种及开发动向。 相似文献
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《廊坊师范学院学报(自然科学版)》2015,(3):26
本发明涉及一种聚合物基微/纳米填料填充改性复合预混料颗粒制备方法,其制备步骤:将非水溶性聚合物基体溶解于第一水溶性溶剂中得均质聚合物溶液;将微/纳米填料分散于第二水溶性溶剂中,经搅拌、加热、超声、添加增溶剂或偶联剂得均质微/纳米填料分散液;将均质微/纳米填料分散液加至均质聚合物溶液中,混合均匀得均质溶液;并将其呈液滴状滴入装有去离子 相似文献
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设计了带预分散进料装置的连续悬浮聚合反应器,并进行了小中试试验。结果表明树脂白球收率达到了94.5%,粒径在0.4-0.6mm的白球比例达到了88.19%,均一系数达到了1.19,粒径分布比传统工艺窄,均匀性较好。 相似文献
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李艳茹 《广播电视大学学报》2007,(2):21-24
佛经中的摩尼是珠之总名,又名如意珠,具有多种异能。唐人受佛经的影响,由摩尼宝珠的某种异能联想创作了小说中奇异的宝珠。这些宝珠根据其功能特性可分为如下几种:济世救民的转轮圣宝,龙神相夺的聚宝神珠,生泉离垢的净水摩尼。这些宝珠故事虽然已经中国化,但仍然与佛经有着密切的关系。 相似文献
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ＡＮｅｗＦａｓｔＡｌｇｏｒｉｔｈｍｆｏｒＣｏｍｐｕｔｉｎｇ２ＤＤｉｓｃｒｅｔｅＣｏｓｉｎｅＴｒａｎｓｆｏｒｍＷｕＨｏｎｇｗｅｎ（吴红文）（ＴｈｅｒｍａｌＥｎｅｒｇｙＥｎｇｉｎｅｅｒｉｎｇＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ，ＳｏｕｔｈｅａｓｔＵｎｉｖ... 相似文献
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Preparation of Glutaraldehyde Cross-Linked Chitosan Beads Under Microwave Irradiation and Properties of Urease Immobilized onto the Beads 总被引：4，自引：0，他引：4
The glutaraldehyde cross-linked chitosan beads were prepared under microwave irradiation and urease was immobilized onto the beads. The activity and the yield of enzyme activity of the immobilized urease were 10.83 U/g carrier and 47.7%, respectively. The optimum conditions of immobilization were 1% of glutaraldehyde volume fraction, 10 mg/g of urease/beads weight ratio, 24 h of the processing time and pH 6.5 of the reaction medium for immobilization. The properties of the immobilized urease were investigated and compared with those of the free enzyme. The optimum pH values were 6.5 and 7.0 for the immobilized and free urease, respectively. The optimum temperature was 60℃ for the free urease, while it shifted to 65 ℃ for the immobilized enzyme. The Michaelis constant Kr, was 9.1 mmol/L for the immobilized and 12.5 mmol/L for the free urease. The immobilized urease retained 40% of its initial enzyme activity even after 10 repeated uses. The immobilized urease stored at 4 ℃ retained 46% of its initial activity even after 35 d. 相似文献
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The Bacillus firmus was immobilized into Ca-alginate beads according to the different initial biomass concentration, calcification time and activation time.Three types of immobilized Bacillus firmus beads were packed respectively in trickling biofilter to purify xylene contained waste gases,and the performance of immobilized-cell biofilter was compared with traditional biofilm attached biofilter packed with two types of ceramic pellets.The results showed that three types of immobilized beads had different capabilities for removing xylene and life-spans.Higher initial biomass in immobilized beads resulted in better performance but shorter life-span.Activation process can remarkably enhance the activity of bacteria,and the removal efficiency of xylene can substantially be improved.Calcification time had influence on life-span of immobilized beads.Without acclimation,the cell-entrapped biofilter can obtain the maximum elimination capacity of 92.4 g/(m~3·h).However,compared with biofilm attached biofilter,it has a poorer intrinsic drawback in volatile organic compounds (VOCs) removal due to the existence of excess mass transfer resistance. 相似文献
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Cultural Studies of Science Education - This paper explores the ways learners respond to and express themselves while interacting with cultural artifacts or cultural realia, beads and beadwork,... 相似文献
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远红外瓷珠热敷对一次性力竭运动疲劳消除的实验研究 总被引：1，自引：0，他引：1
吴琳 《鞍山师范学院学报》2011,13(2):72-74
通过观察远红外瓷珠热敷对一次性力竭运动后血乳酸的变化,探讨其对运动性疲劳消除的作用以及促进机体恢复的可行性.通过对20名运动员一次性力竭运动后血乳酸的测试结果表明：远红外瓷珠热敷能使一次性力竭运动后血乳酸明显下降,有利于消除疲劳,改善运动员的机能状态,提高运动能力. 相似文献
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To prevent expanded polystyrene (EPS) beads from rising up to the surface in the molding process of EPS lightweight concrete, vibration with pressure was applied and the polyvinyl acetate (PVA) emulsion was adopted to im-prove its mechanical properties. The mechanical properties, thermal properties and durability of EPS lightweight concrete were tested. The microstructures of EPS lightweight concrete were observed by scanning electron microscope (SEM). Vibration with pressure reduces the number of small cracks. The 180 d compressive strength and flexural strength increase obviously as a large amount of PVA was added. The mixed amount of PVA has no obvious influence on the thermal per-formance when it is not more than 10% of the cement. Vibration with pressure and surface modification of EPS beads by PVA improve the combination of EPS beads with cement stone and the mechanical properties of EPS lightweight con-crete. 相似文献