Abstract:
The invention relates to substituted monocyclopentadienyl, monoindenyl, monofluorenyl or heterocyclopentadienyl complexes of chromium, molybdenum or tungsten, wherein at least one of the substituents at the cyclopentadienyl ring carries a rigid donor function that is not exclusively linked via sp hybridized carbon or silicon atoms. The invention further relates to a method for polymerizing olefins.
Abstract:
Polymeric fibers and methods of making the polymeric fibers are described. The polymeric fibers are crosslinked hydrogels or dried hydrogels that are prepared from a precursor composition that contains polymerizable material having an average number of ethylenically unsaturated groups per monomer molecule greater than 1.0. The polymeric fibers can contain an optional active agent.
Abstract:
A hierarchical structure that has at least one carbon nanotube extending radially from a nanofiber substrate and related methods of use and manufacture.
Abstract:
The invention relates to an additive-manufacture feedstock, comprising an ethylene-vinyl ester polymer having a melt flow rate of from 0.1 to 150 g/10 min (190 °C/ 2.16 kg), measured according to ASTM D 1238, and a vinyl ester content of from about 1.0 wt% to about 30 wt%, wherein the ethylene-vinyl ester polymer exhibits a Shore A hardness of at least about 60. The pellets and filaments produced from the additive-manufacture feedstock have a high degree of printability in material-extrusion-based 3D printing technology, and can be used to produce 3D printing articles with a high consistency to the targeted 3D model and substantially no warpage. The invention also relates to methods of making the additive-manufacture feedstock and methods of 3D printing using the additive-manufacture feedstock in various forms.
Abstract:
A method of converting a plastics material into a yarn comprises heating the material to melt it and pumping the melted material through an extrusion die (114) to form an extruded filament (116). The extruded filament is cooled and passed through a first draw roller assembly (122) while elevating the temperature of the filament. The filament (116) is heated in a heating zone (126) as it exits the first draw roller assembly. Thereafter the filament is passed through a second draw roller assembly (134) operating at a different linear speed to the first draw roller assembly (122). The filament (116) is spooled after exiting the second draw roller assembly (134).
Abstract:
The invention relates to a process for producing water-absorbing crosslinked polymer fibers, especially micro- or nanofibers, by spinning process, especially electrospinning process and to fibers obtainable by this process.
Abstract:
The invention relate to fibrous mats comprising chitosan nanofibers and, optionally, at least one filler material, at least one additive, or both. The invention also relates to methods of making same, and devices that include a fibrous mat comprising chitosan nanofibers.