可染聚丙烯纤维高速纺丝研究

以苯乙烯辅助马来酸酐接枝聚丙烯(PP-g-(MAH-co-St)作为相容剂与聚丙烯(PP)、尼龙6(PA6)、改性共聚酯(HCDP)按一定配比共混纺丝，实验表明该共混体系具有良好的相容性。改性聚丙烯纤维的染色性能得到明显改善，可以被分散染料染成深色，并且其抗静电性能明显提高。通过流变性能测试，拟定了主要纺丝工艺，并分析了纺丝温度、纺丝速度、纤维纤度等参数对纤维结构和性能的影响。实现了在高速纺丝条件下制备可染聚丙烯纤维，为工业化生产可染聚丙烯纤维作出了有益的探索。     

弹性体改性聚丙烯的研究

为了提高了聚丙烯(PP)的综合性能,本研究通过加入EVA和SBS,分别对聚丙烯(PP)进行了共混改性,并对共混体系的力学性能(拉伸强度、冲击强度等)进行了测试与分析,得出复合材料各组分的最佳配比。EVA和SBS的加入使共混体系的冲击强度明显升高,但拉伸强度有所降低。EVA和SBS的加入量为20%时,共混体系的综合力学性能最好。     

浅谈聚丙烯改性方法

介绍了聚丙烯(PP)化学改性中共聚改性、接枝改性、交联改性的机理、优点及应用等,通过实例论述了其物理改性中共混改性和填充及纤维增强改性的优点及应用。     

改性滑石粉增强增韧聚丙烯研究

以柠檬酸为改性剂对滑石粉进行表面改性,将改性滑石粉与聚丙烯(PP)采用熔融共混方法制备出系列改性滑石粉/PP复合材料;通过红外吸收光谱、扫描电镜和冲击、拉伸性能实验等方法研究改性滑石粉对复合材料的内部微观形貌、力学性能以及流动性能的影响规律,结果表明:滑石粉经柠檬酸改性后能够明显改善与PP的相容性,促进滑石粉颗粒在PP基体中的均匀分散,从而实现复合材料的加工流动性能和冲击韧性、拉伸强度等力学性能的全面提高,同时增强增韧聚丙烯的作用。     

反应性单体改性PP/PS共混物的增容作用

制备了聚丙烯/聚苯乙烯(PP/PS)共混物和反应性单体苯乙烯(St)、丙烯酸(AA)及其混合单体改性PP/PS共混物,用扫描电镜(SEM)、偏光显微镜(POM)和动态黏弹谱仪(DMA)研究了反应性单体改性PP/PS共混物的相形态与动态力学行为.结果表明反应性单体St存在增容作用,促进PS在PP中的分散,使分散相PS的粒子尺寸减小.反应性单体AA存在明显的异相成核作用,使PP的球晶尺寸降低.St改性共混物的增容作用比AA改性共混物的明显,而AA改性共混物的异相成核作用比St改性的大.     

汽车保险杠、仪表盘及门板专用料的研制

本文以小本体聚丙烯(PP)为基料,通过与共聚聚丙烯(CPP)、聚烯烃弹性体(POE)、滑石粉以及 其它助剂共混改性制备汽车专用料。分析检测表明,当PP、CPP、POE和滑石粉的比例为30～40：25～35：5～15：20～30时,共混料完全可以满足汽车保险杠、仪表盘和门板性能要求。     

改性烟用聚丙烯纤维性能研究

采用多组分共混的方法，制成以聚丙烯为主体的纤维，将用于制做烟用纤维滤咀。通过纤度、强度、伸长率、卷曲数、比重的测试分析，说明改性聚丙烯纤维性能均比纯聚丙烯有明显的提高，技术指标均达到了改性要求。     

聚丙烯改性材料结构与性能关系的研究——Ⅰ.聚丙烯与低密度聚乙烯共混改性材料结构与性能关系

对聚丙烯(PP)与聚乙烯(PE)共混改性的配方、工艺条件、以及它们对材料性能的影响,文献中报导不少。但对共混体系的聚态结构以及结构与性质的关系,则所见报导不多。我们认为,要获取性能优良的聚丙烯改性材料,找出性能与结构间的联系规律是有意义的。     

纳米二氧化钛/聚丙烯复合材料的结晶及抗紫外性能研究

利用熔体共混方式制备了纳米TiO2/聚丙烯(PP)复合材料,研究了复合材料的结晶特性、力学性能和抗紫外性能.结果发现:纳米TiO2对聚丙烯有一定的结晶成核作用,填充纳米TiO2的改性PP的球晶尺寸明显小于纯PP;复合材料具有良好的力学性能;随着纳米TiO2含量的增大,复合材料对紫外光的屏蔽效果越强.     

电气石/PP杂化熔喷滤料的驻极性能

基于纳米电气石的自发极化效应,提出了将纳米电气石与聚丙烯(PP)杂化纺丝制备熔喷非织造滤料的构思,以实现过滤材料"高效低阻"的理想过滤性能.研究了纳米电气石的各项性能,通过湿法改性,增强其与聚丙烯的相容性;然后用熔融共混法,制得含有纳米电气石的聚丙烯母粒;最后在熔喷机上纺丝成网,获得含有纳米电气石的聚丙烯熔喷非织造滤料.结果表明,纳米电气石的加入,极大降低了聚丙烯熔喷非织造滤料的过滤阻力,驻极稳定性也得到了很大的改善,可进一步制得高效低阻的空气过滤材料.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that