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Search Results: 1 - 10 of 11608 matches for " 励杭泉 "
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葡聚糖水溶液流变性研究
徐学林,
食品科学 , 2009,
Abstract: ?本实验研究了葡聚糖水溶液的流变性能,选取了五种不同分子量的葡聚糖,分别考查了分子量、溶液浓度、溶液温度等因素对葡聚糖水溶液流变性的影响。结果显示,多数葡聚糖水溶液表现出牛顿流体的特性,而当葡聚糖分子量为531000,溶液浓度为30%时,溶液则表现出假塑性流体的性质,黏度随着剪切速率的提高而降低。当葡聚糖浓度较低时(≤1%),水溶液均表现出一种特殊的流变性,即黏度随着剪切速率增加先降低后升高,本研究对出现这一现象的原因进行了分析。
超高分子量聚乙烯/聚丙烯共混体系流变行为及形态的研究
汪晓东,,金日光
高分子学报 , 1994,
Abstract:
超高分子量聚乙烯增韧聚丙烯的“原位复合”增韧机理
汪晓东,冯威,,金日光
材料研究学报 , 1996,
Abstract: ?用四螺杆挤出机制备了超高分子量聚乙烯(uhmwpe)增韧聚丙烯(pp)的共混合金、研究发现,合金中uhmwpe的形态是由沿其分子链形成的串联微晶粒和松散的分子链段束组成,并在pp基体中形成一种特殊的物理"互穿网络"结构.sem显示了存在于合金断裂形貌中的微晶粒(<0.2μm),而从tem中观察到非晶的uhmwpe分子链段束在pp基体中的连续型分布.本文提出"原位复合"增韧机理来解释uhmwpe增韧pp的机制.
PPO/SEBS-g-MAH共混体系的形态结构与冲击性能
冯威,张强,武德珍,李齐方,,金日光
高分子学报 , 2000,
Abstract: 从亚微相态和冲击性能出发,对比了采用熔融挤出法制备的PPO/SEBS和PPO/SEBSgMAH两种共混物.结果表明,在本文所研究的弹性体用量范围内,PPO/SEBS为“海岛”型结构,而PPO/SEBSgMAH呈现网状结构;PPO/SEBS体系无脆韧转变现象,PPO/SEBSgMAH体系则在弹性体用量为10%~15%时出现明显的脆韧转变,缺口冲击强度达到950J/m,这种超韧现象源于其网状结构的形成.文中进一步用DSC和毛细管流变仪对共混体系的热性能和流变性能进行了测试,探讨了PPO/SEBSgMAH共混物网状结构的形成原因
ppo/sebs--g--mah共混体系的“瞬间原位大取向”增韧模型
冯威,毛立新,武德珍,李齐方,,金日光
材料研究学报 , 2000,
Abstract: ?针对具有网状结构的ppo/sebs--g--mah共混合金冲击断面的形貌和微观形变过程,提出了“瞬间原位大取向”增韧模型.该模型认为,超韧ppo/sebs--g--mah的冲击断裂首先是弹性体周围产生微穴,微穴诱发基体产生剪切带,基体在剪切屈服过程中被网状的弹性体携带共同发生大的取向行为,形成取向分子束,从而吸收大量能量,达到超韧水平.
ppo/sebs--g--mah共混体系的冲击断面和微观形变过程
冯威,毛立新,,李齐方,武德珍,金日光
材料研究学报 , 2000,
Abstract: ?用扫描电子显微镜(sem)观察了ppo/sebs和ppo/sebs--g--mah共混物的常温缺口冲击断面,发现ppo/sebs共混体系的冲击断面上有大量韧窝;ppo/sebs--g--mah共混体系则呈现中心为棒,四周为环的冲击断面形貌.对ppo/sebs--g--mah冲击断面的应力发白区的sem观察结果表明在冲击断面下方,合金发生大的取向;tem的观察结果显示在应力发白区内,弹性体周围存在大量的微穴,未发现银纹.
三聚氰胺改性酚醛基多孔碳材料的制备及其二氧化碳吸附性能
邓静倩,韩家玺,杜中杰,邹威,,张晨
- , 2018, DOI: 10.13543/j.bhxbzr.2018.05.008
Abstract: 采用浓乳液模板法制备三聚氰胺-间苯二酚-甲醛多孔树脂,将其热解后得到了可用于二氧化碳吸附的氮掺杂多孔碳材料。研究了浓乳液模板的分散相体积分数和三聚氰胺含量对多孔碳材料微观形貌的影响,结果表明,在浓乳液模板分散相体积分数为90%的条件下制备的多孔聚合物具有丰富的通孔结构。经过热解后,得到了兼具无机碳骨架和有机氮活性位点的氮掺杂多孔碳材料。进一步研究了不同热解温度和三聚氰胺含量对多孔碳材料二氧化碳吸附性能的影响,二氧化碳的吸附容量最高可达到3.32 mmol/g,同时表现出良好的选择吸附性和再生性。
Abstract:Porous melamine-resorcinol-formaldehyde resins have been fabricated using a concentrated emulsion template method, and partially pyrolyzed to obtain nitrogen-doped porous carbon materials which can be used for carbon dioxide adsorption. The effects of varying the volume fraction of the internal phase of the concentrated emulsion template and the content of melamine on the morphology of the porous structure were investigated. The porous carbon with a volume fraction of the internal phase of the concentrated emulsion template of 90% has a rich pore structure. After partial carbonization, a nitrogen-doped porous carbon material having both an inorganic carbon skeleton and organic nitrogen active sites was obtained. The effects of different carbonization temperatures and melamine content on the carbon dioxide adsorption performance of the porous carbon materials were further studied. The adsorption capacity of carbon dioxide reached as high as 3.32 mmol/g, and the materials showed good selective adsorption and regenerability.
STUDY ON THE IN-SITU COMPOSITE MECHANISM FOR TOUGHNING PP WITH UHMWPE
超高分子量聚乙烯增韧聚丙烯的“原位复合”增韧机理

WANG Xiaodong,FENG Wei,LI Hangquan,JIN Riguang,
汪晓东
,冯威,,金日光

材料研究学报 , 1996,
Abstract: The blends of polypropylene (PP) toughened with ultrahigh moledar weight polye thylene(UHMWPE) were prepared through extrusion by the four-screw extruder. The researches of morphologyand structure for blends demonstrated that UHMWPE was constituted by the
STUDIES ON THE RHEOLOGICAL BEHAVIOR AND MORPHOLOGY OF UHMWPE/PP BLENDS
超高分子量聚乙烯/聚丙烯共混体系流变行为及形态的研究

WANG Xiao-dong,LI Hang-quan,JIN hi-guang,
汪晓东
,,金日光

高分子学报 , 1994,
Abstract: heological, micromorphological and DSC studies were carried out for PP/UHMWPE blends. The phase separation, also called co-continuous structure, in the blends was observed by making use of the difference in staining- rates of PP and UHMWPE. Experimental data stronglysuggested that the different components form "linear interpenetrating netWork" in the blends, from which a "network toughening mechanism" was proposed.
弹性结构的分岔点失稳和极值点失稳
殷有,
力学与实践 , 2015, DOI: 10.6052/1000-0879-14-179
Abstract: 以浅桁架为例,介绍了弹性结构两类不同的失稳形态分岔点失稳和极值点失稳.浅桁架失稳形态与斜杆的柔度λ和倾角α0有关.当α0λ3/4π时为极值点失稳,发生突跳;否则为分岔点型失稳.
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