凹凸棒土复合填充PA-66的增强增韧研究

对凹凸棒土进行表面改性,采用直接熔融共混方法制得凹凸棒土(AT)/聚酰胺(PA)复合材料,以提高复合材料的性能。测量了复合材料的拉伸强度和冲击强度;通过扫描电镜(SEM)照片分析了复合材料的断面结构。结果表明,添加凹凸棒土能提高PA-66的拉伸强度和冲击强度,且当添加量为6质量份时,力学性能最好。     

硬脂酸钠改性镁铝水滑石/EVA电缆复合材料的制备及性能研究

将硬脂酸钠改性水滑石(SLDHs)和氢氧化铝(Al(OH)3)分别与乙烯-醋酸乙烯共聚物(EVA)混炼,制备水滑石/橡胶复合材料。以X-射线衍射(XRD)、硫化仪、万能测试仪、硬度仪及氧指数测试仪对其结构与性能进行表征。实验结果表明:硬脂酸钠改性水滑石/EVA复合材料的预硫化时间和正硫化时间大为缩短。复合材料的抗张强度和伸长率随着阻燃剂的含量增加而减小,硬度随着阻燃剂的含量增加而增加,氧指数随着阻燃剂的含量增加而增加。硬脂酸钠改性水滑石/EVA复合材料和氢氧化铝/EVA复合材料的阻燃效果相近。通过以上性能实验说明硬脂酸钠改性水滑石/EVA复合材料不仅有良好的阻燃效果,而且还有优良的硫化性能和机械性能,因此水滑石将在EVA电缆阻燃材料方面有很好的应用和发展前景。     

KH-550改性纳米凹凸棒/不饱和聚酯聚氨酯 复合材料的研究

将纳米凹凸棒(AT)用偶联剂γ-氨丙基三乙氧基硅烷(KH-550)进行改性处理,经过处理后的AT以化学接枝法接枝到合成的不饱和聚酯聚氨酯树脂(UPPU)上,再加入固化剂、消泡剂等助剂制得不饱和聚酯聚氨酯纳米复合材料。用红外吸收光谱(FT-IR)、扫描电镜(SEM)、力学性能等检测手段对纳米复合材料的结构与性能进行了表征。结果表明当改性AT的含量为1.5%(质量分数)时,纳米复合材料的热稳定性有所提升。同时,纳米粒子不但能够在UPPU基体中达到均匀分散,且其机械性能较未添加改性纳米AT的UPPU有一定改观。     

高分散性碳纳米管/聚乙烯醇纳米复合材料的制备及其性能研究

采用重氮盐法对多壁碳纳米管(MWNT)进行磺化改性,增强碳纳米管在水中的分散性,然后以水为溶剂,以溶液共混法制备高分散性的碳纳米管/聚乙烯醇(MWNT/PVA)纳米复合材料,用红外(FTIR)、扫描电镜(SEM)、热重(TGA)等手段对复合材料的微观结构和性能进行表征和分析.结果表明:该方法可以将碳纳米管均匀地分散在聚乙烯醇(PVA)基体材料中,形成高分散性的碳纳米管/聚乙烯醇纳米复合材料,并且在碳纳米管含量较低的情况下就可以有效地增强聚乙烯醇的耐热性能.     

Pickering微乳液法合成聚苯胺/TiO_2复合纳米微球

以低温水热法制备的超细金红石型TiO2纳米粒子为乳液稳定剂和前驱物,在甲苯/水微乳液体系(Pickering微乳液)中成功地制备了聚苯胺/TiO2(PAn/TiO2)复合纳米微球.用TEM,SEM,IR,TG-DTA等技术对纳米复合材料的形貌,化学结构、相结构和热稳定性能进行了表征.结果表明,复合材料的形貌呈球状,尺寸均一,平均粒径约为46nm;由于TiO2的存在,与纯的聚苯胺相比,复合材料中聚苯胺的晶化度较低;TiO2和聚苯胺分子链之间存在着较强的相互作用力,并对复合材料的热稳定性起促进作用.     

TiO2修饰介孔分子筛复合材料的制备与性能

设计了TiO2修饰介孔分子筛复合材料的综合实验.采用水热法结合溶胶-凝胶法制备了锐钛矿型TiO2修饰介孔分子筛的光催化复合材料(TiO2-MCM-41),运用多种分析手段(SEM、XRD、FT-IR及UV-Vis)对其结构进行了表征,研究其对有机染料亚甲基蓝溶液模拟污水的光催化降解活性,探讨了材料组成、结构与性能之间的...     

水热法合成CuO/Fe2O3复合材料

以CuCl2.2H2O、FeCl3.6H2O和Na2C2O4为反应物,利用水热法合成CuO/Fe2O3复合材料纳米颗粒.采用X射线衍射仪(XRD)、扫描电镜(SEM)对产物进行了表征,并且对产物进行了红外光谱仪(IR)分析.结果表明:所得CuO/Fe2O3复合材料形貌为立方体结构.研究了CuO/Fe2O3复合材料的红外特性,在670 cm-1到450 cm-1之间出现了Cu—O键伸缩振动特征峰.     

Al_(87)Ce_3Ni_(8.5)Mn_(1.5)纳米非晶复合材料的制备和性能研究

采用单辊快凝直接制备和先制成非晶单相合金再经不同温度退火两种方法制备了高强度的Al87Ce3Ni8.5Mn1.5纳米非晶复合材料.用X光衍射(XRD)技术,透射电镜(TEM)和差示扫描量热(DSC)研究和比较了材料的形成条件、显微结构、α-Al晶粒尺寸、体积分数和显微硬度.后一种方法制备的复合材料结构更均匀,显微硬度更高,过程较容易控制.     

回收PE/ZnO/POE增强增韧改性纳米复合材料的研究

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.     

中国力学学会2000年国际、国内学术活动计划(续)

11全国第十届计算流体力学会议12亚洲第四届计算流体力学会议计算网格生成新方法 ;ＣＦＤ新方法 ;ＣＦＤ新应用 ;ＣＦＤ的流动物理研究 ;先进的计算软件介绍 .9月15日～17日绵阳 10 0张涵信北京航空航天大学 ,10 0 0 83 ;电话 :82 3 170 12 (Ｏ)9月18日～2 1日绵阳 12 0主持人 :庄逢甘 ;联系人 :张涵信北京航空航天大学 ,10 0 0 83电话 :82 3 170 12 (Ｏ)13第十一届全国复合材料学术会议复合材料原材料 ,树脂基、陶瓷基、碳基及金属基复合材料基本性能及制备工艺的研究 ;复合材料力学与结构分析 ;复合材料结构设计与试验研究 ;复合材料界面…     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

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.     

浅谈移民问题

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.     

Sister Carrie, an Adherent of Desires

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.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.