Abstract:
The present disclosure generally provides methods and apparatus for efficiently crosslinking silicon carbide fiber precursor polymers with electron beam radiation. The methods and apparatus utilize a platform (14, 114) containing silicon carbide fiber precursor polymer (16, 116). The temperature of the platform (14, 114) is regulated while the silicon carbide fiber precursor polymer (16, 116) is irradiated to thereby regulate the temperature of the irradiated silicon carbide fiber precursor polymer thereon. In this way, the temperature of the irradiated silicon carbide fiber precursor polymer (16, 116) is regulated via the platform (14, 114) both during and after it is subjected to radiation. At least one of the platform (14, 114) and the e-beam radiation mechanism (12, 112) may be translated with respect to the other to irradiate different portions of the silicon carbide fiber precursor polymer (16, 116) and, ultimately, the entirety of the silicon carbide fiber precursor polymer contained on the platform (14, 114).
Abstract:
The present invention relates to a polymer fiber, in particular a polyethylene polymer fiber obtainable by melt-spinning of a polyethylene polymer, the use of the fiber and a process for the manufacture of the fiber. Further, the present invention relates to a heat sealable filter paper comprising said polymer fiber.
Abstract:
Wound dressing articles comprising a nonwoven web comprising a plurality of fibers having grafted pendant hydrophilic groups, methods that use high energy irradiation for making a plurality of fibers having grafted pendant hydrophilic groups, useful for making wound dressing articles.
Abstract:
High strength fibers of a polymeric material and having outstanding tensile strength, Young's modulus values, and creep resistance are prepared by treating a fiber from a polymeric material, which may contain a crosslinking promoter, by (a) crosslinking the polymeric material; (b) heating the fiber to a temperature, T1, which i) in the event the polymer is amorphous, is above the glass transition temperature (Tg) of the polymer and, ii) in the event the polymer is crystalline, is above the second order transition temperature, T c, and below the crystalline melting temperature (Tm) of the polymer; (c) drawing the fiber to a draw ratio of at least about 2 at a rate of at least about 200% per minute and (d) cooling the fiber.
Abstract:
The present disclosure describes a method for producing an article comprising providing a polyolefin-derived crosslinked article having an initial gel fraction, G i ; treating the crosslinked article with a treating agent at a temperature below the melting point of the crosslinked article to provide a treated article having a final gel fraction, G f , the treating agent comprising a nitrogen-containing compound, wherein a ratio, R, is defined as the ratio of the final gel fraction to the initial gel fraction: R = G f /G i ; and wherein the ratio R is: 1.010
Abstract translation:本发明描述了用于生产制品的方法,其包括提供具有初始凝胶分数G i的聚烯烃衍生的交联制品; 用处理剂在低于交联制品熔点的温度下处理交联制品以提供具有最终凝胶分数Gf的处理制品,处理剂包含含氮化合物, 其中比率R被定义为最终凝胶分数与初始凝胶分数的比率:R = G f / G i; 并且其中比率R I是:1.010 < R <1.200。 p>
Abstract:
Beschrieben wird ein Verfahren zur Herstellung von Formkörpern, insbesondere von Fasern oder Folien, auf der Basis von modifizierten Polyolefinen und/oder modifizierten Polyamiden. Dieses Verfahren ist dadurch gekennzeichnet, dass 1.) thermoplastische Formkörper auf Basis von thermoplastischen Polyolefinen, die auf Monomere mit einer Doppelbindung zurückgehen, oder von thermoplastischen Polyamiden als Ausgangsmaterial herangezogen werden, 2.) die Polyolefine oder Polyamide des Formkörpers vernetzt und 3.) die vernetzten Polyolefine oder vernetzten Polyamide mit aktiviertem elementarem Schwefel sulphuriert werden. Die hiernach erhaltenen modifizierten Formkörper lassen sich vorteilhaft durch Carbonisierung und gegebenenfalls anschließendes Graphitisieren in Carbonformkörper überführen. Die sulphurierten modifizierten Formkörper sind wirtschaftlich und in vorteilhafter Weise herstellbar und zeichnen sich insbesondere dadurch aus, dass aus einem sulphurierten thermoplastischem Polymer in einer einzigen Hochtemperaturbehandlung beliebige Formkörper aus verdichtetem turbostratischem Kohlenstoff oder Graphit mit sehr hohen Kohlenstoffausbeuten hergestellt werden können.
Abstract:
Knit fabric compositions have now been discovered that often have a balanced combination of desirable properties. Said fabric compositions comprise olefin block interpolymers. These compositions allow for improved processability when manufacturing knitted fabrics.