PROCUREMENT OF PRIMARY REFERENCE MATERIALS

所提出的工作涉及合成大量的加成物。 聚四氢呋喃(PTMO)，4，4二苯基甲烷二异硫酸盐 (MDI)和聚氨基甲酸乙酯(PUU)。他们将学习散装和 表面表征，并加工成管材和薄板。 飞行员数量、物资目标已经确定。制造 提供了详细信息。无菌包装样品 将对聚氨基甲酸乙酯进行表征，以确定其效果 伽马辐射和评估地表随时间的变化 聚氨基甲酸乙酯尿素一级标准物质。这些研究 旨在确定伽马射线的退化效果 辐照灭菌技术。此外，调查人员 还将解决期间可能发生的依赖时间的更改 在应用之前进行存储。

The proposed work involves the synthesis of a lot of additivefree polytetramethylene (PTMO), 4, 4 diphenylmethane diisothionate (MDI), and polyurethaneurea (PUU). They will study bulk and surface characterization, and fabrication into tubes and sheets. Pilots quantity material goals have been identified. Fabrication details are provides. Sterile, packages samples of the polyurethaneurea will be characterized to determine the effect of gamma radiation and to assess time dependent surface changes in the polyurethaneurea primary reference materials. These studies are aimed at determining the effect of degradation by the gamma irradiation sterilization technique. In addition, the investigators will also address timedependent changes that might occur during storage prior to application.