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H. -Y. Nie M. J. Walzak N. S. McIntyre 《Journal of Materials Engineering and Performance》2004,13(4):451-460
Atomic force microscopy (AFM) uses a very sharp pointed mechanical probe to collect real-space morphological information of
solid surfaces. AFM was used in this study to image the surface morphology of a biaxially oriented polypropylene film. The
polymer film is characterized by a nanometer-scale, fiberlike network structure, which reflects the drawing process used during
the fabrication of the film. AFM was used to study polymer-surface treatment to improve wettability by exposing the polymer
to ozone with or without ultraviolet (UV) irradiation. Surface-morphology changes observed by AFM are the result of the surface
oxidation induced by the treatment. Due to the topographic features of the polymer film, the fiberlike structure has been
used to check the performance of the AFM tip. An AFM image is a mixture of the surface morphology and the shape of the AFM
tip. Therefore, it is important to check the performance of a tip to ensure that the AFM image collected reflects the true
surface features of the sample, rather than contamination on the AFM tip. 相似文献
5.
储松潮 《电力电容器与无功补偿》2003,(1)
电容器用双向拉伸聚丙烯薄膜的打滑现象 ,是影响薄膜电容器制造质量的关键因素之一。本文分析了薄膜打滑机理、薄膜粗化机理 ,并进行了大量工艺试验 ,研究了影响薄膜打滑的主要因素 ,并提出了解决方法。优化合理的加工温度工艺是改进薄膜打滑的关键 相似文献
6.
3-芳基苯并呋喃酮是一种高效自由基捕捉剂,它能有效地捕获以碳为中心的自由基,许多实验表明它在双向拉伸聚丙烯(BOPP)稳定过程中起到了重要作用。比较了3-芳基苯并呋喃酮与传统抗氧剂的抗氧机理,并将其与受阻酚类和亚磷酸酯类抗氧剂复配成三元抗氧剂DP101,通过其在BOPP中的测试实验,结果表明DP101的抗氧化性能优于传统的二元抗氧剂Irganox B225。 相似文献
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BOPP专用料对生产薄膜的影响 总被引:1,自引:0,他引:1
本文研究了BOPP专用料对生产中所产生的缩幅、熔体压力、生产速度的影响,揭示了BOPP专用料的分子量分布和立构规整度分布是影响生产性能的根本原因。 相似文献
9.
Masayuki Fujii Kazuyuki Tohyama Tetsuro Tokoro Masamitsu Kosaki Yuji Muramoto Naohiro Hozumi Masayuki Nagao 《Electrical Engineering in Japan》2002,141(2):8-16
Polymer materials have excellent dielectric and insulation properties; however, those properties in AC high field region have not been known well. Recently we established an evaluation method of high‐field AC dissipation current waveform of polymer materials 1 . AC dissipation current waveforms of polyethylene and polypropylene films show nonlinear distortion in AC high‐field region. This nonlinearity was thought to be related to the behavior of AC space charge formation in the sample near electrodes. The properties of space charge formed under AC high field at power frequency seem to differ from those formed under DC high field. The measurement of AC space charge distribution is not so easy due to the resolution limit of the space charge measurement. We studied the dielectric properties of biaxially oriented polypropylene (BOPP) film under AC high field up to 120 °C. It was found that tan δ, AC dissipation current (Ixr), and unbalanced component of capacitive current (ΔIxc) increased when the temperature became higher. In particular, ΔIxc increased above some threshold field and was considered to be due to the AC space charge formation. This AC space charge layer near electrode is thought to be formed due to carrier injection under AC high‐field application. Usually, the carrier mobility becomes smaller on lowering the temperature. Most of the carriers injected from the electrode are trapped near the electrode in the sample film. But in the high‐temperature region, the carrier mobility becomes larger and the carrier injection starts to increase from lower field. Many more carriers are injected from the electrode. It is thought that some of the injected carriers are trapped inside the sample film; the others go through the sample to the opposite side. © 2002 Wiley Periodicals, Inc. Electr Eng Jpn, 141(2): 8–16, 2002; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10018 相似文献
10.
The hot embossing of grating-based optically variable devices has been demonstrated in biaxially-oriented polypropylene (BOPP). Embossing of the grating structures was examined over a range of temperatures (80-155 °C) at 135 kN force. However, only at temperatures above the glass transition temperature, Tg, was high quality replication achieved over a full embossing area of 80 × 80 mm. The embossing of several different types of optically variable device has been examined including portrait, non-portrait and 3-dimensional images. The images embossed into BOPP have displayed an optically variable effect when viewed in transmitted light. 相似文献