Matches in SemOpenAlex for { <https://semopenalex.org/work/W1969263295> ?p ?o ?g. }
Showing items 1 to 83 of
83
with 100 items per page.
- W1969263295 endingPage "586" @default.
- W1969263295 startingPage "577" @default.
- W1969263295 abstract "Poly(ester urethane ureas) (PesURUs) and poly(ether urethane ureas) (PetURUs) synthesized from diphenylmethane-4,4′-diisocyanate and poly(butylene adipate) diol, and poly(tetramethylene oxide) diol or poly(propylene oxide) diol, respectively, were hydrolyzed at 70°C for various periods up to 16 weeks. Differences in thermal and mechanical properties of as-received dry samples are correlated with the number and strength of hydrogen bonds formed between urea/urethane groups of hard segments and polyester or polyether groups of soft segments. Gel permeation chromatography measurements show that the molar mass of linear PesURUs markedly decreases with the hydrolysis time, whereas that of linear PetURUs remains almost unaffected. PesURU crosslinked by polymeric isocyanate has lower crystallinity, but shows somewhat better resistance to hydrolysis than its linear counterpart because of its more stable three-dimensional molecular structure. Water uptake at 37°C, dynamic mechanical thermal analysis, and differential scanning calorimetry thermograms determined for redried hydrolyzed specimens concurrently show that advancing hydrolysis accounts for decrease in the crystallinity (if any) of soft polyester segments, in the efficacy of hydrogen bonding and in crosslinking density. Experimental data indicate that hydrolytic resistance of PetURUs is primarily determined by (1) the hydrolytic stability of individual types of present groups, (2) steric hindrances affecting the access of water molecules to these groups, and (3) the hydrophilicity of backbones. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 577–586, 1998" @default.
- W1969263295 created "2016-06-24" @default.
- W1969263295 creator A5017427198 @default.
- W1969263295 creator A5040869266 @default.
- W1969263295 creator A5087488416 @default.
- W1969263295 creator A5091728327 @default.
- W1969263295 date "1998-10-17" @default.
- W1969263295 modified "2023-10-01" @default.
- W1969263295 title "Hydrolytic resistance of model poly(ether urethane ureas) and poly(ester urethane ureas)" @default.
- W1969263295 cites W2986529115 @default.
- W1969263295 cites W561507860 @default.
- W1969263295 cites W594494061 @default.
- W1969263295 cites W658041742 @default.
- W1969263295 doi "https://doi.org/10.1002/(sici)1097-4628(19981017)70:3<577::aid-app20>3.0.co;2-x" @default.
- W1969263295 hasPublicationYear "1998" @default.
- W1969263295 type Work @default.
- W1969263295 sameAs 1969263295 @default.
- W1969263295 citedByCount "27" @default.
- W1969263295 countsByYear W19692632952015 @default.
- W1969263295 countsByYear W19692632952017 @default.
- W1969263295 countsByYear W19692632952018 @default.
- W1969263295 countsByYear W19692632952019 @default.
- W1969263295 countsByYear W19692632952020 @default.
- W1969263295 countsByYear W19692632952021 @default.
- W1969263295 countsByYear W19692632952022 @default.
- W1969263295 countsByYear W19692632952023 @default.
- W1969263295 crossrefType "journal-article" @default.
- W1969263295 hasAuthorship W1969263295A5017427198 @default.
- W1969263295 hasAuthorship W1969263295A5040869266 @default.
- W1969263295 hasAuthorship W1969263295A5087488416 @default.
- W1969263295 hasAuthorship W1969263295A5091728327 @default.
- W1969263295 hasBestOaLocation W19692632951 @default.
- W1969263295 hasConcept C119394753 @default.
- W1969263295 hasConcept C121332964 @default.
- W1969263295 hasConcept C159985019 @default.
- W1969263295 hasConcept C178790620 @default.
- W1969263295 hasConcept C185592680 @default.
- W1969263295 hasConcept C188027245 @default.
- W1969263295 hasConcept C192562407 @default.
- W1969263295 hasConcept C2777075361 @default.
- W1969263295 hasConcept C2779515768 @default.
- W1969263295 hasConcept C2780407432 @default.
- W1969263295 hasConcept C39519442 @default.
- W1969263295 hasConcept C46275449 @default.
- W1969263295 hasConcept C59061564 @default.
- W1969263295 hasConcept C94412978 @default.
- W1969263295 hasConcept C97355855 @default.
- W1969263295 hasConceptScore W1969263295C119394753 @default.
- W1969263295 hasConceptScore W1969263295C121332964 @default.
- W1969263295 hasConceptScore W1969263295C159985019 @default.
- W1969263295 hasConceptScore W1969263295C178790620 @default.
- W1969263295 hasConceptScore W1969263295C185592680 @default.
- W1969263295 hasConceptScore W1969263295C188027245 @default.
- W1969263295 hasConceptScore W1969263295C192562407 @default.
- W1969263295 hasConceptScore W1969263295C2777075361 @default.
- W1969263295 hasConceptScore W1969263295C2779515768 @default.
- W1969263295 hasConceptScore W1969263295C2780407432 @default.
- W1969263295 hasConceptScore W1969263295C39519442 @default.
- W1969263295 hasConceptScore W1969263295C46275449 @default.
- W1969263295 hasConceptScore W1969263295C59061564 @default.
- W1969263295 hasConceptScore W1969263295C94412978 @default.
- W1969263295 hasConceptScore W1969263295C97355855 @default.
- W1969263295 hasIssue "3" @default.
- W1969263295 hasLocation W19692632951 @default.
- W1969263295 hasOpenAccess W1969263295 @default.
- W1969263295 hasPrimaryLocation W19692632951 @default.
- W1969263295 hasRelatedWork W1976504390 @default.
- W1969263295 hasRelatedWork W1998758429 @default.
- W1969263295 hasRelatedWork W2006229030 @default.
- W1969263295 hasRelatedWork W2013047623 @default.
- W1969263295 hasRelatedWork W2062601369 @default.
- W1969263295 hasRelatedWork W2091423752 @default.
- W1969263295 hasRelatedWork W2179730538 @default.
- W1969263295 hasRelatedWork W2319438693 @default.
- W1969263295 hasRelatedWork W4243748775 @default.
- W1969263295 hasRelatedWork W2004848631 @default.
- W1969263295 hasVolume "70" @default.
- W1969263295 isParatext "false" @default.
- W1969263295 isRetracted "false" @default.
- W1969263295 magId "1969263295" @default.
- W1969263295 workType "article" @default.