Matches in SemOpenAlex for { <https://semopenalex.org/work/W2001093088> ?p ?o ?g. }
Showing items 1 to 69 of
69
with 100 items per page.
- W2001093088 endingPage "2562" @default.
- W2001093088 startingPage "2551" @default.
- W2001093088 abstract "Polytetrafluoroethylene (PTFE) virgin powder was ultradrawn uniaxially by a two-stage draw. A film, compression molded from powder below the melting temperature (Tm), was initially solid-state coextruded to an extrudate draw ratio (EDR) of 6–20 at an established optimum extrusion temperature of 325°C, near the Tm of 335°C. These extrudates from first draw were found to exhibit the highest ductility at 45–100°C for the second-stage tensile draw, depending on the initial EDR and draw rate. The maximum achievable total draw ratio (DRt, max) was 36–48. Such high ductility of PTFE, far below the Tg (125°C) and Tm, is in sharp contrast to other crystalline polymers that generally exhibit the highest ductility above their Tg and near Tm. The unusual draw characteristics of PTFE was ascribed to the existence of the reversible crystal/crystal transitions around room temperature and the low intermolecular force of this polymer, which leads to a rapid decrease in tensile strength with temperature. The structure and tensile properties of drawn products were sensitive to the initial EDR, although this had no significant influence on DRt,max. The most efficient and highest draw was achieved by the second-stage tensile draw of an extrudate with the highest EDR 20 at 100°C, as evaluated by the morphological and tensile properties as a function of DRt. The efficiency of draw for the cold tensile draw at 100°C was a little lower than that for solid-state coextrusion near the Tm. However, significantly higher tensile modulus and strength along the fiber axis at 24°C of 60 ± 2 GPa and 380 ± 20 MPa, respectively, were achieved by the two-stage draw, because the DRt,max was remarkably higher for this technique than for solid-state coextrusion (DRt,max = 48 vs. 25). The increase in the crystallite size along the fiber axis (D0015), determined by X-ray diffraction, is found to be a useful measure for the development of the morphological continuity along the fiber axis of drawn products.© 1998 John Wiley & Sons, Inc. J. Polym. Sci. B Polym. Phys. 36: 2551–2562, 1998" @default.
- W2001093088 created "2016-06-24" @default.
- W2001093088 creator A5011805508 @default.
- W2001093088 creator A5040299840 @default.
- W2001093088 creator A5042094743 @default.
- W2001093088 creator A5043675062 @default.
- W2001093088 creator A5044178917 @default.
- W2001093088 date "1998-10-01" @default.
- W2001093088 modified "2023-09-26" @default.
- W2001093088 title "Uniaxial drawing of polytetrafluoroethylene virgin powder by extrusion plus cold tensile draw" @default.
- W2001093088 doi "https://doi.org/10.1002/(sici)1099-0488(199810)36:14<2551::aid-polb8>3.0.co;2-v" @default.
- W2001093088 hasPublicationYear "1998" @default.
- W2001093088 type Work @default.
- W2001093088 sameAs 2001093088 @default.
- W2001093088 citedByCount "21" @default.
- W2001093088 countsByYear W20010930882012 @default.
- W2001093088 countsByYear W20010930882014 @default.
- W2001093088 countsByYear W20010930882015 @default.
- W2001093088 countsByYear W20010930882016 @default.
- W2001093088 countsByYear W20010930882017 @default.
- W2001093088 countsByYear W20010930882020 @default.
- W2001093088 countsByYear W20010930882023 @default.
- W2001093088 crossrefType "journal-article" @default.
- W2001093088 hasAuthorship W2001093088A5011805508 @default.
- W2001093088 hasAuthorship W2001093088A5040299840 @default.
- W2001093088 hasAuthorship W2001093088A5042094743 @default.
- W2001093088 hasAuthorship W2001093088A5043675062 @default.
- W2001093088 hasAuthorship W2001093088A5044178917 @default.
- W2001093088 hasConcept C112950240 @default.
- W2001093088 hasConcept C149912024 @default.
- W2001093088 hasConcept C159985019 @default.
- W2001093088 hasConcept C18337273 @default.
- W2001093088 hasConcept C192562407 @default.
- W2001093088 hasConcept C196029304 @default.
- W2001093088 hasConcept C2776512210 @default.
- W2001093088 hasConcept C2778958987 @default.
- W2001093088 hasConcept C2780557906 @default.
- W2001093088 hasConcept C521977710 @default.
- W2001093088 hasConceptScore W2001093088C112950240 @default.
- W2001093088 hasConceptScore W2001093088C149912024 @default.
- W2001093088 hasConceptScore W2001093088C159985019 @default.
- W2001093088 hasConceptScore W2001093088C18337273 @default.
- W2001093088 hasConceptScore W2001093088C192562407 @default.
- W2001093088 hasConceptScore W2001093088C196029304 @default.
- W2001093088 hasConceptScore W2001093088C2776512210 @default.
- W2001093088 hasConceptScore W2001093088C2778958987 @default.
- W2001093088 hasConceptScore W2001093088C2780557906 @default.
- W2001093088 hasConceptScore W2001093088C521977710 @default.
- W2001093088 hasIssue "14" @default.
- W2001093088 hasLocation W20010930881 @default.
- W2001093088 hasOpenAccess W2001093088 @default.
- W2001093088 hasPrimaryLocation W20010930881 @default.
- W2001093088 hasRelatedWork W2023562867 @default.
- W2001093088 hasRelatedWork W2031686472 @default.
- W2001093088 hasRelatedWork W2044626300 @default.
- W2001093088 hasRelatedWork W2045171965 @default.
- W2001093088 hasRelatedWork W2055874165 @default.
- W2001093088 hasRelatedWork W2089085266 @default.
- W2001093088 hasRelatedWork W2354203570 @default.
- W2001093088 hasRelatedWork W2729932191 @default.
- W2001093088 hasRelatedWork W2795554382 @default.
- W2001093088 hasRelatedWork W4224861465 @default.
- W2001093088 hasVolume "36" @default.
- W2001093088 isParatext "false" @default.
- W2001093088 isRetracted "false" @default.
- W2001093088 magId "2001093088" @default.
- W2001093088 workType "article" @default.