Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene, and has numerous applications because it is chemically inert. [3] . The commonly known brand name of PTFE-based composition is Teflon by Chemours, [4] a spin-off from DuPont, which originally invented the compound in 1938. [4]

The pass-through frequency (PTF) indicator captures the degree of supply chain exposure to geographic concentration risk in global production networks. It measures the frequency that a supply chain involves transactions with suppliers of a …

2024年3月1日 · We propose a new metric of supply chain exposure to network concentration risk: the pass-through frequency (PTF). The PTF measures the frequency that a supply chain engages with the industrial sectors in a particular region of analytical concerns (natural hazards, geopolitical risks).

2024年10月3日 · Poly(trimethylene 2,5-furandicarboxylate) (PTF) is an emergent biobased polymer potentially able to outperform the fossil-based poly(ethylene terephthalate) counterpart. In this work, computational chemistry and vibrational spectroscopy tools are combined to elucidate the conformational preferences of PTF in

2025年1月16日 · Originating from carbohydrates, poly (trimethylene furanoate) (PTF), the reference aromatic furan-based homopolymer, is a particularly interesting furan-based polyester, due to superior thermal and mechanical performance, and also to exceptional gas barrier properties [28], [29].

2021年6月4日 · But what could a post-pandemic pharma supply chain look like? In this issue, we take a look at some of the key lessons we learn over the past year and how industry can adapt and innovate in order to prevent a similar situation from arising in the future.

2024年3月3日 · Here, we present a detailed description of the in situ isothermal crystallization of poly (trimethylene 2,5-furandicarboxylate) (PTF) as revealed by real-time Fourier transform infrared spectroscopy (FTIR) and grazing incidence wide-angle X-ray scattering (GIWAXS).

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PDF Chain - A graphical user interface for the PDF Toolkit (pdftk). The GUI supports all common features of the command line tool in a comfortable way.

PDF Chain 是一个具有图形化用户界面的PDF工具包，提供一种简单的方法来处理 PDF文件，可完成PDF文档的合并、切分、增加背景和附件等操作。