coc是什么塑料
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发布时间：2022-04-23 12:27
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时间：2023-05-09 03:15
环烯烃共聚物（COC）的是一种非晶态的高分子聚合物，只有几个别制造商生产。COC是一个相对较新级别的聚合物，与聚丙烯和聚乙烯相比。这种材料主要用于要求玻璃般清晰产品，包括镜头，小瓶，显示器和医疗设备。
COC has a transparency similar to glass in its natural form. Typical COC material will have a higher molus than HDPE and PP. Due to its chemistry, the higher the molus, the more brittle it becomes. COC also has a high moisture barrier for a clear polymer along with a low absorption rate. In medical applications, COC is noted to be a high purity proct with low extractables. COC is also a halogen-free proct.
环烯烃共聚物的自然形态，类似玻璃。典型环烯烃共聚物材料，比高密度聚乙烯和聚丙烯模量较高。由于其化学，模量越高，就越变得脆。环烯烃共聚物也是一个防潮湿的，低吸水率的高透明聚合物。在医疗应用领域，环烯烃共聚物是一个低萃取物纯度高的产品。环烯烃共聚物也是一个无卤素产品。
Some properties will vary e to monomer content. These include glass transition temperature, viscosity, and stiffness. The glass transition temperature of these polymers can exceed 150 °C
Extrusion
COC can be extruded with both cast and blown film equipment. These films are then used in consumer applications including food and pharmaceutical packaging. Commercial structures of COC used in blister packs are typically coextruded with a thick COC core and thin polypropylene skin layers. PVC and PvDC can also be placed on the skins via lamination. Profile extrusion is another method that can be used to make COC reinforced tubes or pipes.
Molding
While there are many different types of molding, COC is primarily used in injection molding. Its natural clarity makes it useful in lenses for cameras, projectors and copiers. COC has little to no extractables which make it useful in diagnostic and medical devices. Most COC grades can also undergo sterilization by gamma radiation, steam and ethylene oxide.
Fiber Spinning
COC has unique electrical properties that resist dielectric breakdown and have a very low dielectric loss over time. Because of this COC is used in filter media that require a charge retention to work properly
兄弟 ，下面的你自己翻译吧，
热心网友
时间：2023-05-09 03:15
