Matches in SemOpenAlex for { <https://semopenalex.org/work/W2029129950> ?p ?o ?g. }
Showing items 1 to 79 of
79
with 100 items per page.
- W2029129950 endingPage "52" @default.
- W2029129950 startingPage "46" @default.
- W2029129950 abstract "Vinyl pivalate (VPi) was bulk-polymerized at 30, 40, and 50°C using a low temperature initiator, i. e. 2,2′-azobis(2,4-dimethylvaleronitrile) (ADMVN). The effects of polymerization temperature and initiator concentration were investigated in terms of polymerization behavior and molecular structures of poly(vinyl pivalate) (PVPi) and corresponding poly(vinyl alcohol) (PVA) microfibrillar fiber obtained by saponification in KOH/methanol/water. Low polymerization temperature using ADMVN proved to be successful in obtaining PVA of syndiotacticity-rich high molecular weight. PVPi had a number-average degree of polymerization (Pn) of 27 100–35 900, and a degree of branching for pivaloyl group of 0.8–1.0 at 30°C, 1.0–1.3 at 40°C, and 1.4–1.7 at 50°C at conversions below 40%. Saponification of PVPi yielded PVA having a Pn of 10 400–16 500, and syndiotactic diad (S-diad) content of 58.8–61.5%. It was found that all PVA specimens represented microfibrillar morphologies, with high crystallinity and orientation. The S-diad content and crystal melting temperature were higher with PVA prepared from PVPi polymerized at lower temperatures. Vinylpivalat (VPi) wurde bei 30, 40 und 50°C mit dem Niedertemperaturinitiator 2,2′-Azobis(2,4-dimethylvaleronitril) (ADMVN) polymerisiert. Der Einfluß von Polymerisationstemperatur und Initiatorkonzentration auf das Polymerisationsverhalten und die molekulare Struktur von Polyvinylpivalat (PVPi) und von durch Verseifung von PVPi in KOH/Methanol/Wasser zu Polyvinylalkohol (PVA) erhaltenen mikrofibrillären PVA-Fasern wurde untersucht. Durch die niedrige Polymerisationstemperatur mit ADMVN konnte PVA mit einer hohen Syndiotaktizität und hohem Molekulargewicht erhalten werden. Das PVPi hatte zahlenmittlere Polymerisationsgrade (Pn) von 27 100–35 900 und Verzweigungsgrade der Pivaloylgruppen von 0.8–1.0 bei 30°C, 1.0–1.3 bei 40°C und 1.4–1.7 bei 50°C und Umsätzen jeweils unter 40%. Das durch Verseifung von PVPi erhaltene PVA (Pn = 10 400–16 500) hatte einen Anteil an syndiotaktischen Diaden (S-Diaden) von 58.8–61.5%. Alle PVA-Proben zeigten eine mikrofibrilläre Morphologie mit hoher Kristallinität und Orientierung. Der Gehalt an S-Diaden und die Kristallitschmelztemperatur von PVA waren um so höher, je niedriger die Polymerisationstemperatur des PVPi war." @default.
- W2029129950 created "2016-06-24" @default.
- W2029129950 creator A5004746768 @default.
- W2029129950 creator A5026132076 @default.
- W2029129950 creator A5047144471 @default.
- W2029129950 creator A5069474967 @default.
- W2029129950 creator A5073866582 @default.
- W2029129950 creator A5074098980 @default.
- W2029129950 creator A5076381858 @default.
- W2029129950 creator A5083856777 @default.
- W2029129950 creator A5089525427 @default.
- W2029129950 date "1999-11-01" @default.
- W2029129950 modified "2023-09-26" @default.
- W2029129950 title "Bulk polymerization of vinyl pivalate using low-temperature azoinitiator and saponification for the preparation of poly(vinyl alcohol) microfibrils" @default.
- W2029129950 doi "https://doi.org/10.1002/(sici)1522-9505(19991101)271:1<46::aid-apmc46>3.0.co;2-5" @default.
- W2029129950 hasPublicationYear "1999" @default.
- W2029129950 type Work @default.
- W2029129950 sameAs 2029129950 @default.
- W2029129950 citedByCount "13" @default.
- W2029129950 countsByYear W20291299502013 @default.
- W2029129950 countsByYear W20291299502014 @default.
- W2029129950 countsByYear W20291299502016 @default.
- W2029129950 crossrefType "journal-article" @default.
- W2029129950 hasAuthorship W2029129950A5004746768 @default.
- W2029129950 hasAuthorship W2029129950A5026132076 @default.
- W2029129950 hasAuthorship W2029129950A5047144471 @default.
- W2029129950 hasAuthorship W2029129950A5069474967 @default.
- W2029129950 hasAuthorship W2029129950A5073866582 @default.
- W2029129950 hasAuthorship W2029129950A5074098980 @default.
- W2029129950 hasAuthorship W2029129950A5076381858 @default.
- W2029129950 hasAuthorship W2029129950A5083856777 @default.
- W2029129950 hasAuthorship W2029129950A5089525427 @default.
- W2029129950 hasConcept C15761196 @default.
- W2029129950 hasConcept C15920480 @default.
- W2029129950 hasConcept C178790620 @default.
- W2029129950 hasConcept C185592680 @default.
- W2029129950 hasConcept C188027245 @default.
- W2029129950 hasConcept C191516044 @default.
- W2029129950 hasConcept C2778512808 @default.
- W2029129950 hasConcept C2780666587 @default.
- W2029129950 hasConcept C44228677 @default.
- W2029129950 hasConcept C46275449 @default.
- W2029129950 hasConcept C521977710 @default.
- W2029129950 hasConcept C58018886 @default.
- W2029129950 hasConcept C8010536 @default.
- W2029129950 hasConceptScore W2029129950C15761196 @default.
- W2029129950 hasConceptScore W2029129950C15920480 @default.
- W2029129950 hasConceptScore W2029129950C178790620 @default.
- W2029129950 hasConceptScore W2029129950C185592680 @default.
- W2029129950 hasConceptScore W2029129950C188027245 @default.
- W2029129950 hasConceptScore W2029129950C191516044 @default.
- W2029129950 hasConceptScore W2029129950C2778512808 @default.
- W2029129950 hasConceptScore W2029129950C2780666587 @default.
- W2029129950 hasConceptScore W2029129950C44228677 @default.
- W2029129950 hasConceptScore W2029129950C46275449 @default.
- W2029129950 hasConceptScore W2029129950C521977710 @default.
- W2029129950 hasConceptScore W2029129950C58018886 @default.
- W2029129950 hasConceptScore W2029129950C8010536 @default.
- W2029129950 hasIssue "1" @default.
- W2029129950 hasLocation W20291299501 @default.
- W2029129950 hasOpenAccess W2029129950 @default.
- W2029129950 hasPrimaryLocation W20291299501 @default.
- W2029129950 hasRelatedWork W1974306468 @default.
- W2029129950 hasRelatedWork W1997568718 @default.
- W2029129950 hasRelatedWork W2009376276 @default.
- W2029129950 hasRelatedWork W2022821757 @default.
- W2029129950 hasRelatedWork W2027732130 @default.
- W2029129950 hasRelatedWork W2029129950 @default.
- W2029129950 hasRelatedWork W2053294149 @default.
- W2029129950 hasRelatedWork W2077869858 @default.
- W2029129950 hasRelatedWork W2111144847 @default.
- W2029129950 hasRelatedWork W2466381605 @default.
- W2029129950 hasVolume "271" @default.
- W2029129950 isParatext "false" @default.
- W2029129950 isRetracted "false" @default.
- W2029129950 magId "2029129950" @default.
- W2029129950 workType "article" @default.