共查询到20条相似文献，搜索用时 515 毫秒
1.
采用两种不同孔径的分子筛(5A、13X)制备分子筛增强顺丁橡胶复合材料.研究表明,分子筛的孔径、表面处理及填充量对橡胶基复合材料的硫化特性和力学性能均产生影响.分子筛孔径越大,对提高顺丁橡胶的硫化速率和界面粘结力效果越明显.改性后分子筛增强顺丁橡胶复合材料的拉伸性能和撕裂强度都得到提高.改性后的大孔径分子筛13X增强顺丁橡胶材料,能提高材料的耐老化性能. 相似文献
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彭宪湖 《常熟理工学院学报》2010,24(4):82-85
探讨了ABS树脂的生产工艺和聚合原理,分析了橡胶含量、橡胶粒径、橡胶粒径分布对ABS冲击强度的影响,详细阐明了橡胶粒径的相关控制方法.研究结果表明,增加橡胶含量,ABS树脂的冲击性能增加;如果橡胶粒径小,则相应材料的冲击强度增强. 相似文献
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陈丰 《安徽科技学院学报》2002,16(4):58-60
对于快速成型中的光造型制作工艺,通过在光敏树脂中加入短纤维而制得复合材料.实验发现复合材料制作的样件的弹性模量和拉伸强度明显高于纯树脂固化样件,且其在后固化过程中的收缩量也比后者小.实验结果为光造型系统的制造提供最优的操作参数. 相似文献
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《绵阳师范学院学报》2017,(5)
以硫酸钙晶须(CSW)改性PA66材料,并测试CSW改性PA66复合材料的摩擦系数、拉伸强度和冲击强度.结果表明:随着CSW用量的增加,PA66复合材料的摩擦系数先减小后增大;拉伸强度和冲击强度都呈现出先增大后减小的趋势.改性PA66复合材料性能得到了提高. 相似文献
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陈丰 《安徽技术师范学院学报》2002,16(4):58-60
对于快速成型中的光造型制作工艺，通过在光敏树脂中加入短纤维而制得复合材料，实验发现复合材料制作的样件的弹性模量和拉伸强度明显高于纯树脂固化样件，且其在后固化过程中的收缩量也比后者小，实验结果为光造型系统的制造提供最优的操作参数。 相似文献
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通过碱+马来酸酐(MA)和碱+偶联剂+MA对苎麻进行联合改性处理,采用真空辅助树脂传递模塑(VARTM)制备得到两种苎麻/环氧树脂(RF/EP)复合材料,分别是RF1/EP和RF2/EP,并对其进行力学性能测试.结果表明,与未经任何处理制得的RF0/EP复合材料对照,两种表面处理方法制得的复合材料树脂含量无明显变化,力学性能也有所降低.RF1/EP的拉伸强度和抗弯强度较RF0/EP分别降低了4.33%和17.13%;RF2/EP的拉伸强度和弯曲强度较RF0/EP分别降低了16.01%和22.45%.故工艺需要选择恰当的碱和马来酸酐溶液浓度,尽量减少纤维整体结构的变化,提升纤维与基体附着力,从而提升复合材料的力学性能. 相似文献
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硼酸镁晶须对金属、陶瓷及塑料等材料具有较强的机械增强作用,在交通运输等领域有较大的潜在应用价值。采用水热法制备出带状的硼酸镁纳米材料,产物的产量和纯度都比较高,形貌均匀,对进一步研究硼酸镁纳米材料的性质及应用具有一定的支撑作用。 相似文献
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《绵阳师范学院学报》2018,(2):60-65
按一定比例加入助剂改性回收聚乙烯(PE)塑料,采用熔融共混的方法,按照一定的工艺配方将回收聚乙烯和助剂混合注塑成型,制备得到改性纳米复合材料;通过测试其力学性能,用扫描电镜(SEM)、X射线衍射(XRD)来表征其结构,找出性能理想的工艺配方.结果表明:当纳米氧化锌(Zn O)与聚乙烯辛烯共弹性体(POE)添加的质量之比为3∶2时,回收聚乙烯和填充剂、抗氧剂、增塑剂、增韧剂等助剂制备出复合材料的综合性能良好,所得复合材料的拉伸强度比回收聚乙烯提高了23.54%,弯曲强度提高了15.87%,其衍射峰的强度增加了50%,且峰变得尖细,其晶化程度较大. 相似文献
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TiCp/ZM5镁基复合材料的组织和性能 总被引：2，自引：0，他引：2
采用XD法制备TiCp／Al预制块．然后将其加入到Ar气保护的镁液中，通过机械搅拌制备TiCp／ZM5复合材料．对其显微组织和力学性能进行分析测试。实验结果表明：反应生成的TiC颗粒非常细小．粒径在1—3μm。加入5％TiC粒子后，TiCp／ZM5复合材料中的基体晶粒明显细化，Mg17Al12相变细小．加入10％的TiC粒子后，基体晶粒进一步细化，TiC粒子略有团聚。随着TiC粒子含量的增加．TiCp／ZM5复合材料的抗拉强度、屈服强度、硬度值提高，延伸率降低。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 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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《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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Anton Franks 《English in Education》1999,33(2):39-49
This paper looks at the way drama works to bring a model of an arts curriculum into reality. He also shows how drama is valuable when discussed as a separate, autonomous subject in the school curriculum as opposed to one subsumed within English. He argues for a view of the arts and gives an example of a sequence of work in an English GCSE class based around Arthur Miller's play View from the Bridge. From this he draws out several strands about the relationship of the drama curriculum to the individual students and teachers, the school, and to culture. He also emphasises the primacy of performance in drama education. 相似文献