Matches in SemOpenAlex for { <https://semopenalex.org/work/W2057625604> ?p ?o ?g. }
Showing items 1 to 89 of
89
with 100 items per page.
- W2057625604 endingPage "761" @default.
- W2057625604 startingPage "751" @default.
- W2057625604 abstract "The heat of fusion of virgin and melt-processed polytetrafluoroethylene (PTFE) was determined using the Clapeyron equation. Experimental data were obtained from PVT experiments and high-temperature x-ray diffraction measurements. For virgin, as-polymerized PTFE, the melting temperature is given by where, for Tm in degrees Celsius, A = 346.3±1.2, B = 0.095±0.003, and P is the pressure in kilograms per square centimeter. At the end of the atmospheric-pressure melting interval, the amorphous and crystalline specific volumes V1 and Vc are 0.6517 and 0.492 cm3/g, respectively. Thus the heat of fusion is 24.4 cal/g, or nearly twice the value reported previously. The increases in enthalpy and volume at the melting point both indicate a degree of crystallinity of about 75–80% although infrared, x-ray, and NMR data give much higher levels. Data from calorimetry, NMR, and dynamic mechanical measurements indicate that in virgin PTFE some of the crystals continue to experience torsional oscillations at temperatures below the room-temperature transitions. This indicates that there are at least two kinds of crystalline regions. For previously melted PTFE, Tm is determined by A = 328.5±0.7 and B = 0.095±0.002, the volumes are Vam = 0.6349 and Vcr = 0.4855 cm3/g, and the heat of fusion is 22.2 cal/g. The entropy of fusion for PTFE is much closer to that of polyethylene than was previously believed." @default.
- W2057625604 created "2016-06-24" @default.
- W2057625604 creator A5006695627 @default.
- W2057625604 creator A5012561192 @default.
- W2057625604 creator A5046667140 @default.
- W2057625604 creator A5061596552 @default.
- W2057625604 date "1982-04-01" @default.
- W2057625604 modified "2023-10-18" @default.
- W2057625604 title "The heat of fusion of polytetrafluoroethylene" @default.
- W2057625604 doi "https://doi.org/10.1002/pol.1982.180200416" @default.
- W2057625604 hasPublicationYear "1982" @default.
- W2057625604 type Work @default.
- W2057625604 sameAs 2057625604 @default.
- W2057625604 citedByCount "64" @default.
- W2057625604 countsByYear W20576256042013 @default.
- W2057625604 countsByYear W20576256042014 @default.
- W2057625604 countsByYear W20576256042015 @default.
- W2057625604 countsByYear W20576256042016 @default.
- W2057625604 countsByYear W20576256042017 @default.
- W2057625604 countsByYear W20576256042019 @default.
- W2057625604 countsByYear W20576256042020 @default.
- W2057625604 crossrefType "journal-article" @default.
- W2057625604 hasAuthorship W2057625604A5006695627 @default.
- W2057625604 hasAuthorship W2057625604A5012561192 @default.
- W2057625604 hasAuthorship W2057625604A5046667140 @default.
- W2057625604 hasAuthorship W2057625604A5061596552 @default.
- W2057625604 hasConcept C113196181 @default.
- W2057625604 hasConcept C121332964 @default.
- W2057625604 hasConcept C129564387 @default.
- W2057625604 hasConcept C13530604 @default.
- W2057625604 hasConcept C138885662 @default.
- W2057625604 hasConcept C158525013 @default.
- W2057625604 hasConcept C159985019 @default.
- W2057625604 hasConcept C178790620 @default.
- W2057625604 hasConcept C185592680 @default.
- W2057625604 hasConcept C188027245 @default.
- W2057625604 hasConcept C192562407 @default.
- W2057625604 hasConcept C202270520 @default.
- W2057625604 hasConcept C20556612 @default.
- W2057625604 hasConcept C2779751980 @default.
- W2057625604 hasConcept C2780557906 @default.
- W2057625604 hasConcept C3288061 @default.
- W2057625604 hasConcept C41895202 @default.
- W2057625604 hasConcept C46275449 @default.
- W2057625604 hasConcept C56052488 @default.
- W2057625604 hasConcept C8010536 @default.
- W2057625604 hasConcept C97355855 @default.
- W2057625604 hasConceptScore W2057625604C113196181 @default.
- W2057625604 hasConceptScore W2057625604C121332964 @default.
- W2057625604 hasConceptScore W2057625604C129564387 @default.
- W2057625604 hasConceptScore W2057625604C13530604 @default.
- W2057625604 hasConceptScore W2057625604C138885662 @default.
- W2057625604 hasConceptScore W2057625604C158525013 @default.
- W2057625604 hasConceptScore W2057625604C159985019 @default.
- W2057625604 hasConceptScore W2057625604C178790620 @default.
- W2057625604 hasConceptScore W2057625604C185592680 @default.
- W2057625604 hasConceptScore W2057625604C188027245 @default.
- W2057625604 hasConceptScore W2057625604C192562407 @default.
- W2057625604 hasConceptScore W2057625604C202270520 @default.
- W2057625604 hasConceptScore W2057625604C20556612 @default.
- W2057625604 hasConceptScore W2057625604C2779751980 @default.
- W2057625604 hasConceptScore W2057625604C2780557906 @default.
- W2057625604 hasConceptScore W2057625604C3288061 @default.
- W2057625604 hasConceptScore W2057625604C41895202 @default.
- W2057625604 hasConceptScore W2057625604C46275449 @default.
- W2057625604 hasConceptScore W2057625604C56052488 @default.
- W2057625604 hasConceptScore W2057625604C8010536 @default.
- W2057625604 hasConceptScore W2057625604C97355855 @default.
- W2057625604 hasIssue "4" @default.
- W2057625604 hasLocation W20576256041 @default.
- W2057625604 hasOpenAccess W2057625604 @default.
- W2057625604 hasPrimaryLocation W20576256041 @default.
- W2057625604 hasRelatedWork W1995530480 @default.
- W2057625604 hasRelatedWork W1997496157 @default.
- W2057625604 hasRelatedWork W2041967201 @default.
- W2057625604 hasRelatedWork W2057625604 @default.
- W2057625604 hasRelatedWork W2059449474 @default.
- W2057625604 hasRelatedWork W2068697859 @default.
- W2057625604 hasRelatedWork W4238068608 @default.
- W2057625604 hasRelatedWork W4251060694 @default.
- W2057625604 hasRelatedWork W4252168371 @default.
- W2057625604 hasRelatedWork W2520896584 @default.
- W2057625604 hasVolume "20" @default.
- W2057625604 isParatext "false" @default.
- W2057625604 isRetracted "false" @default.
- W2057625604 magId "2057625604" @default.
- W2057625604 workType "article" @default.