Guiding of Highly Charged Ions through PC Nanocapillaries

Angular distribution and current dependence of the transmitted ion fraction are investigated for 40 keV Xe7+ bombarding on polycarbonate (PC) nanocapillaries. By measuring the angular distribution of the transmitted ion fraction, a strong guiding efect is found in PC nanocapillaries. Furthermore, with increase of the incident current, a turning point of the transmitted ion fraction is found, which is explained qualitatively by the discharge capacity of the nanocapillaries.

在Windows下PC机作为半双工RS-485网络主机通信程序的设计

描述了一个以PC机作为半双工RS-485网络主机,工作于Windows平台上的通讯程序。该程序特点是通过使用异步通信WIN32API和多线程及多种同步量来实现半双工通信方式。

PC-CAMAC数据获取与处理系统

本文描述了一个基于IBM个人微机和CAMAC单机箱的多参数数据获取与处理系统。最大获取参数数目由CAMAC机箱中插入插件决定，一般可以达到几十以上。实验数据采用事件记录方式存入磁盘。用户在多层次菜单和交互方式下管理。系统用软件实现可选择的数据排零功能，能进行在线或离线分析，能够累积多个单参数谱和双参数谱，并能在谱中加上条件变量窗。能对一维谱、二维谱散点图，二维维谱轴测图进行静态显示或活显示。主机用IBM PC/AT机，ADC采用CAMAC AD811，在数据记硬盘情况下，对八参数事件的最大记数率可达约1KC/S

Suppression of phase separation in PC/PMMA blend film by thermoset oligomer

Phase separation of bisphenol A polycarbonate (PC) and poly(methyl methacrylate) (PMMA) thin blend film is suppressed by addition of solid epoxy oligomer. Epoxy has strong intermolecular interactions with both PC and PMMA, while PC and PMMA are quite incompatible with each other. Consequently, phase separation in the PC/PMMA blend film pushes epoxy to the interface; at the same time, PC and epoxy react readily at the interface to form a cross-linking structure, binding PMMA chains together. Therefore, the interface between PC and PMMA is effectively reinforced, and the PC/PMMA thin blend film is stabilized against phase separation. On the other hand, only an optimal content of epoxy (i.e., 10 wt %) can serve as an efficient interfacial agent. In contrast to the traditional reactive compatibilization, here we observed that the cross-linking structure along the interface is much more stable than block or graft copolymers. Atomic force microscopy (AFM) is used to characterize the morphological changes of the blend films as a function of annealing time. Two-dimensional fast Fourier transform (2D-FFT) of AFM data allows quantitative investigation of the scaling behavior of phase separation kinetics.

Influence of rubber content in ABS in wide range on the mechanical properties and morphology of PC/ABS blends with different composition

A series of acrylonitrile-butadiene-styrene (ABS) with different rubber content were prepared by diluting ABS grafting copolymer containing 60% rubber with a styrene-acrylonitrile copolymer. ABS prepared were blended with bisphenol-A-polycarbonate (PC) at the ratio of 70/30, 50/50, and 30/70 to prepare PC/ABS blends. Influence of rubber content in ABS on the properties of ABS and PC/ABS blends were investigated. PC/ABS blends with different compositions got good toughness when the rubber in ABS increased to the level that ABS itself got good toughness. The tensile properties and processability of PC/ABS blends decreased with the increase of the total rubber content introduced into the blends. ABS with the rubber content of 30 wt% is most suitable to be used to prepare PC/ABS blends. The rubber content in ABS affected the viscosity of ABS, and subsequently the viscosity ratio of PC to ABS. As a result, the morphology of PC/ABS blends varied. The increase of rubber content in ABS results in finer structure of PC/ABS blends.

HIPS-g-MA共聚物对HIPS/PC共混物相容性、形态和拉伸性能的影响

研究了 HIPS/ PC共混物的相容性及 HIPS- MA对 HIPS( 30 ) / PC( 70 )共混物的相容性、形态和拉伸性能的影响。DSC研究结果表明 ,HIPS/ PC共混物中 PS的玻璃化转变温度 ( Tg)不随组成而变化 ,而PC的 Tg 随其质量分数的降低逐渐向低温移动 ,说明 HIPS/ PC是部分相容体系。通过 DSC、扫描电镜形态观察和拉伸性能测试结果发现 ,当 HIPS- g- MA的含量低于 7.5 %时 ,共混物的相容性改善不明显 ,当其含量达到 7.5 %时 ,对共混物有明显的乳化作用 ,说明饱和的界面浓度在 7.5 %左右。HIPS- g- MA接枝共聚物在 HIPS( 30 ) / PC( 70 )共混物中的增容作用可能是酯交换反应原位生成的嵌段共聚物所致

The compatibility and morphology of HIPS/PC and HIPS-g-GMA/PC blends

The compatibility and morphology of HIPS/PC and HIPS-g-GMA/PC blends were studied. The compatibility and morphology of HIPS/PC blends were characterized by DSC and SEM, respectively. The result of DSC shows that T-g of PS doesn't change with the blend composition, and T-g of PC decreases with the increase in weight fraction of HIPS, which indicates that the PC/HIPS blend is a partially miscible system. Results of SEM indicate that the decrease in T-g of PC results from PS interpenetrating into the phase of PC, and no change in T-g of PS results from PC not interpenetrating into the phase of PS. The copolymer of HIPS-g-GMA was prepared by reactive grafting method. The IR spectrum shows that GMA is grafted on the chain of HIPS. The compatibility and morphology of HIPS-gGMA (35)/PC (65) were studied by DSC and SEM. PC (65)/HEPS-g-GMA (35) blend exhibits reduced size of disperse phase, enhanced interface adhesion and lower T-g of PC phase as compared with the PC(65)/HIPS(35) blend. It implies that HIPS-g-GMA is an effective compatibilizer of the HIPS/PC blend.

Na_3Eu(DPA)_3-PC树脂的制备及其发光性能

根据稀土有机配合物 Na3Eu(DPA) 3(DPA:2 ,6-pyridine dicarboxylic acid)的发光强和热稳定性高的特点 ,采用加热方法将 Na3Eu(DPA) 3掺入 PC树脂中 ,制成发光塑料树脂 .其发光性能结果表明 ,Na3Eu(DPA) 3掺入 PC树脂后 ,仍保持稀土有机配合物原有的发光特性 ,制成的 Na3Eu(DPA) 3-PC树脂复合材料具有良好的发光性能 ,其发光强度与稀土有机配合物 Na3Eu(DPA) 3掺入的比例量有关 ,但没有一定的线性关系 .

Effect of the core-shell latex polymer content on the compatibility, morphology and mechanical properties of PC/PBA-cs-PMMA blends

The toughening effect of the content of a core-shell poly(butyl acrylate)/poly(methyl methacrylate) latex polymer (PBA-cs-PMMA) on the mechanical properties, morphology and compatibility of its blends with polycarbonate(PC), i.e., PC/PBA-cs-PMMa, was studied. The mechanical properties of the blends are strongly affected by varying the content of PBA-cs-PMMA in the blend. When the PBA-cs-PMMA content is only 5 wt.-%, the impact strength of PC/PBA-cs-PMMA is almost 19 times as high as that of pure PC, indicating that PBA-cs-PMMA is a very good impact modifier for PC. With increasing interphacial layer thickness and decreasing interphacial tension, the interphacial activity becomes more and more effective and, at the same time, miscibility increases too.

Effects of the compatibilizer PP-g-GMA on morphology and mechanical properties of PP/PC blends

Effects of the compatibilizer polypropylene grafted with glycidyl methacrylate(PP-g-GMA) on the morphology, thermal, rheological and mechanical properties of polypropylene and polycarbonate blends (PP/PC) were studied. It was found that the addition of PP-g-GMA significantly changed their morphology. The mean size of domains reduced from 20 mu m to less than 5 mu m. The dispersed domain size is also strongly dependent upon the content of PP-g-GMA. The interfacial tension of PP/PC/PP-g-GMA (50/30/20) is only about one-tenth of PP/PC (70/30). The crystallization temperature of PP in PP/PC/PP-g-GMA is 5-8 degrees C higher than that of PP in PP/PC blends. Characterization studies based on mechanical properties, differential scanning calorimetry, rheology and morphological evidence obtained by using scanning electron microscopy support the hypothesis that an in-situ copolymer PP-g-PC was formed during the blending process. (C) 1997 Elsevier Science Ltd.

高耐热型系列ABS/PC合金的研制及其应用

介绍了高耐热型、高耐热高抗冲击型及高耐热阻燃型ABS/PC合金的研制和应用。

高耐热型系列ABS/PC合金的研制

介绍了高耐热型、高耐热高抗冲击型及高耐热阻燃型ABS/PC合金的研制和应用。

含核－壳聚合物共混体系PC／PBA－cs－PMMA的研究

将聚碳酸酯（ＰＣ）和聚丙烯酸丁酯－聚甲基丙烯酸甲酯核－壳聚合物（ＰＢＡ－ｃｓ－ＰＭＭＡ），采用密炼机以不同条件机械混合。经力学性能测试、形态结构观察和转变行为表征表明，ＰＣ与ＰＭＭＡ具有一定的相容性，ＰＢＡ－ｃｓ－ＰＭＭＡ能很好地分散在ＰＣ中，当其含量超过１０％，共混物的冲击强度值为ＰＣ的１０余倍，是ＰＣ的良好增韧剂。增韧机理属银纹和剪切屈服共存。