增强UV印刷结合力的聚酯薄膜生产工艺及其涂布液制备方法简析

采用在薄膜表面在线涂布一层水溶性共聚酯的方法,其涂布液主要采用高玻璃化温度共聚酯和低玻璃化温度共聚酯进行配比,在通用的双向拉伸聚酯薄膜(BOPET)生产线上增加在线涂布设备,使用D棒和喷液模头配合进行在线涂布,并配套适宜的拉膜生产工艺,可生产出增强UV印刷结合力的聚酯薄膜。     

疏水性聚酯薄膜的制备及表面形貌分析

利用NaOH溶液化学刻蚀聚酯薄膜成功制得疏水性薄膜.研究了聚酯在碱性溶液中发生水解反应时外界条件对刻蚀结果的影响规律,分析了外界化学条件引起表面微观物理形貌的变化及其所对应的表面特性.结果表明,薄膜经pH为12的碱液在40℃下超声刻蚀5 min左右,并用无水乙醇浸泡,可达到与水接触角120°以上的疏水效果.     

五大聚酯薄膜产品系列

汕头海洋第一聚酯薄膜有限公司的前身是汕头海洋聚酯片基厂,引进了德国布鲁克纳公司具有八十年代末期国际先进水平的双轴定向拉伸聚酯薄膜生产设备和全套软件技术,年设计能力2200吨。公司经投产几年来的消化吸收,不断的技术改造,目前年生产能力已达3000吨/年。公司技术力量雄厚,工程技术人员占职工总人数30%以上,为公司在市场开发和产品质量的不断提高提供了基础。现公司主要产品有烫金薄膜、包装薄膜、电容薄膜、全息激光商标专用薄膜和音像带基五大聚酯薄膜产品系列。多年来公司获得了国家、省、市科技奖励共1     

Ag离子注入聚合物表面形貌原子力显微镜观察及其特性研究

采用MEVVA离子注入机引出的Ag离子进行了聚酯薄膜改性研究，注入后的聚酯膜表面结构发生了很大的变化，用原子力显微镜观察了注入样品表面形貌的变化，表面粗糙度与注量密切相关。透射电子显微镜观察注入聚酯膜的横截面表明，随注量的增加，在注入层形成了纳米颗粒和富集的碳颗粒。这些颗粒增强了注入层表面强化效果。注入层表面电阻率随注量的增加而明显地下降，用纳米硬度计测量显示，Ag离子注入可明显地提高聚酯膜表面硬度和弹性模量，从而极大地增强了表面抗磨损特性。讨论了Ag离子注入聚酯膜改善特性的机理。     

溅射效应对离子注入聚合物表面形貌的影响

采用MEVVA离子注入机引出的离子进行了聚酯薄膜改性研究,考虑到注入离子对表面溅射的强弱与离子的质量密切相关,所以选用质量大小不等的3种离子Cu,Si和C为注入离子,注入后的聚酯膜表面结构发生了很大的变化,用原子力显微镜观察了注入样品表面形貌的变化,表面粗糙度与注入离子质量密切相关.实验结果表明,注入前聚酯薄膜表面粗糙,表面突起密集地分布在表面,其高度可达20～25 nm,C和Si注入后表面突起高度下降到5 nm,随注入离子质量的增加,在注入层粗糙度增加,Cu注入后在表面形成了弥散分布Cu原子的析出纳米颗粒.Cu颗粒起伏高度可达到50 nm.这些变化对聚酯薄膜表面物理化学特性有着重要的影响.     

对苯二甲酸及聚酯膜生物降解

聚酯废弃物形成的白色垃圾对环境的污染日益严重,采用生物方法降解聚酯是目前国际上研究的热点．对苯二甲酸是合成聚酯的主要原料,其本身也具有一定的毒性．作者采用从活性污泥中提取的菌株和粗酶液,对对苯二甲酸和聚酯薄膜进行生物降解探讨．实验结果和动力学分析表明,提取的菌株和粗酶液对对本二甲酸有很好的降解作用,对PET薄膜也有明显的刻蚀痕迹．     

气相法沉积PTFE薄膜及其疏水性

分别以载玻片、陶瓷片、镀铝聚酯膜、普通白纸和Cu片为基底,聚四氟乙烯(PTFE)粉末为原料,采用电子束蒸发法沉积聚合物薄膜。对于基底载玻片和陶瓷片,采用2%H2SO4溶液刻蚀预处理后在其上沉积厚度为125nm的聚合物薄膜;Cu片用不同浓度草酸刻蚀预处理后在其上沉积厚度为62 nm的聚合物薄膜;而基底镀铝聚酯膜和白纸,直接在其上沉积不同厚度的PTFE薄膜。通过傅里叶变换红外光谱仪(FT-IR)、原子力显微镜(AFM)、接触角测量仪分别对薄膜的成分、表面形貌和疏水性进行表征。结果表明:经刻蚀处理后,基底表面粗糙度皆增大。载玻片由亲水性转变为疏水性,陶瓷片无明显变化,Cu片显示良好的疏水性;沉积薄膜后,载玻片表面接触角增大到138°,而陶瓷片接触角可以达到142°;在粗糙度较大的白纸表面沉积不同厚度的PTFE薄膜,膜厚对接触角具有显著影响,当膜厚为225 nm时,接触角达到151°,滞后角为8°;经0.5%草酸刻蚀的Cu片表面膜的接触角达到153°,滚动角为2°,具有良好的超疏水性。     

繪图用聚酯薄膜的表面处理試驗

聚酯薄膜具有良好的透明性、尺寸稳定性和較高的机械强度。用聚酯薄膜作繪图紙,可以提高图紙质量,简化制图过程。但聚酯薄膜表面光滑,不亲水,着色性能差,很难直接用铅笔或普通繪图墨汁在其表面繪图。所以,在繪图前,一般都需要将聚酯薄膜表面进行机械或化学处理,以适应繪图的需要。此外,在多数情况下,还要配制专用墨汁。     

高哑度哑光聚酯薄膜生产工艺和母料配制方法简析

采用适当的不同粒径二氧化硅进行复配并添加适量的聚酯弹性体作为聚酯切片母料添加剂的方法配制切片母料,再使用该母料与普通中性切片进行配比作为原料,并配套适宜的拉膜生产工艺,可在通用的双向拉伸聚酯薄膜(BOPET)生产线上生产出高哑度的聚酯薄膜,满足下游高档装饰客户的低光泽度装饰效果的要求。     

聚酯/SiO2/有机硅复合涂料的合成与性能

以正硅酸乙酯和有机硅氧烷为原料,采用溶胶-凝胶法合成透明的SiO2/有机硅树脂,然后与聚酯进行缩合反应,在聚碳酸酯(PC)表面上制备硬质的聚酯/SiO2/有机硅复合薄膜.探讨聚酯和SiO2/有机硅树脂配比对复合涂料性能的影响,并采用红外光谱、热重分析、原子力显微镜、扫描电镜、紫外光谱和X射线衍射等方法对复合材料进行表征...     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the