FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2321316415> ?p ?o ?g. }

• W2321316415 endingPage "3004" @default.
• W2321316415 startingPage "2993" @default.
• W2321316415 abstract "The chain packing, crystal thickness, molecular dynamics, and melting temperature of α-form isotactic polypropylene (iPP) drawn uniaxially at high temperatures of 100–150 °C were investigated using solid-state (SS) NMR and DSC. Two types of iPP samples with disordered (α1) and relatively ordered (α2-rich) packing structures were prepared via different thermal treatments and drawn up to an engineering strain (e) of approximately 20. High-resolution 13C NMR detected continuous α2 → α1 transformations in the original α2-rich samples over the entire deformation range at all drawing temperatures (Tds). A sudden α1 → α2 transformation was found to occur in the original α1 sample in the small e range of approximately 3–7 at Td = 140 °C. Then, in the late stage, the newly grown α2 structure reversely transformed into α1 structure with further increase in e, as observed in the original α2-rich sample. These results indicate that at least two different processes are involved in large deformations. On the basis of crystallographic constraints, the continuous α2 → α1 transformation over the entire deformation range is attributed to molecular-level melting and recrystallization facilitated by chain diffusion. The steep α1 → α2 transformation in the smaller e range is assigned to isotropic melting and recrystallization induced by stress. After the large deformations (e ≈ 20) of the original α2-rich and α1 samples at Td = 150 and 140 °C, respectively, 1H spin diffusion verified increases in the crystal thickness in both the former (14.1 at e = 0 → 20.1 nm at e = 20) and the latter (9.2 → 17.0 nm). Centerband-only detection of exchange (CODEX) NMR at 120 °C demonstrated that the correlation time (⟨τc⟩) of the helical jump for the former drastically decreased from ⟨τc⟩ = 52.4 ± 5.2 at e = 0 to 9.3 ± 1.8 ms at e = 20 but slightly increased from 4.2 ± 1.3 to 7.1 ± 0.9 ms for the latter. Additionally, DSC indicated that the melting temperature (Tm) for the former decreased considerably from 173 °C at e = 0 to 165 °C at e = 20, whereas the melting temperature (Tm) remained nearly invariant at 163 °C for the latter. On the basis of these findings, we conclude that the local packing structure plays a crucial role in determining the molecular dynamics of the stems and Tm of largely deformed iPP materials. The established relations among the structures, the dynamics, and the thermal properties provide a useful guide to achieving improved properties of iPP materials under processing." @default.
• W2321316415 created "2016-06-24" @default.
• W2321316415 creator A5008605509 @default.
• W2321316415 creator A5016265728 @default.
• W2321316415 date "2014-04-16" @default.
• W2321316415 modified "2023-09-27" @default.
• W2321316415 title "Two Chain-Packing Transformations and Their Effects on the Molecular Dynamics and Thermal Properties of α-Form Isotactic Poly(propylene) under Hot Drawing: A Solid-State NMR Study" @default.
• W2321316415 cites W1963992788 @default.
• W2321316415 cites W1965831132 @default.
• W2321316415 cites W1966910457 @default.
• W2321316415 cites W1969523885 @default.
• W2321316415 cites W1969655165 @default.
• W2321316415 cites W1972787763 @default.
• W2321316415 cites W1981008671 @default.
• W2321316415 cites W1981622595 @default.
• W2321316415 cites W1986739645 @default.
• W2321316415 cites W1991170801 @default.
• W2321316415 cites W2003956408 @default.
• W2321316415 cites W2004417989 @default.
• W2321316415 cites W2008670454 @default.
• W2321316415 cites W2010415811 @default.
• W2321316415 cites W2012699394 @default.
• W2321316415 cites W2017569008 @default.
• W2321316415 cites W2019564128 @default.
• W2321316415 cites W2020933253 @default.
• W2321316415 cites W2023558084 @default.
• W2321316415 cites W2026137371 @default.
• W2321316415 cites W2027696416 @default.
• W2321316415 cites W2028831705 @default.
• W2321316415 cites W2030222948 @default.
• W2321316415 cites W2032201846 @default.
• W2321316415 cites W2032504774 @default.
• W2321316415 cites W2036153541 @default.
• W2321316415 cites W2040686362 @default.
• W2321316415 cites W2042492666 @default.
• W2321316415 cites W2044088052 @default.
• W2321316415 cites W2045138251 @default.
• W2321316415 cites W2047564987 @default.
• W2321316415 cites W2051286395 @default.
• W2321316415 cites W2051571199 @default.
• W2321316415 cites W2052681368 @default.
• W2321316415 cites W2057473899 @default.
• W2321316415 cites W2057694448 @default.
• W2321316415 cites W2058583892 @default.
• W2321316415 cites W2059899012 @default.
• W2321316415 cites W2061525171 @default.
• W2321316415 cites W2066311806 @default.
• W2321316415 cites W2069542451 @default.
• W2321316415 cites W2072180517 @default.
• W2321316415 cites W2072905140 @default.
• W2321316415 cites W2075629818 @default.
• W2321316415 cites W2079609617 @default.
• W2321316415 cites W2082461641 @default.
• W2321316415 cites W2083142657 @default.
• W2321316415 cites W2084804018 @default.
• W2321316415 cites W2086489304 @default.
• W2321316415 cites W2099501517 @default.
• W2321316415 cites W2106211749 @default.
• W2321316415 cites W2111353140 @default.
• W2321316415 cites W2115682140 @default.
• W2321316415 cites W2128675838 @default.
• W2321316415 cites W2131097234 @default.
• W2321316415 cites W2146003467 @default.
• W2321316415 cites W2156026313 @default.
• W2321316415 cites W2320639595 @default.
• W2321316415 cites W2329183768 @default.
• W2321316415 doi "https://doi.org/10.1021/ma5004369" @default.
• W2321316415 hasPublicationYear "2014" @default.
• W2321316415 type Work @default.
• W2321316415 sameAs 2321316415 @default.
• W2321316415 citedByCount "17" @default.
• W2321316415 countsByYear W23213164152015 @default.
• W2321316415 countsByYear W23213164152016 @default.
• W2321316415 countsByYear W23213164152018 @default.
• W2321316415 countsByYear W23213164152019 @default.
• W2321316415 countsByYear W23213164152020 @default.
• W2321316415 countsByYear W23213164152023 @default.
• W2321316415 crossrefType "journal-article" @default.
• W2321316415 hasAuthorship W2321316415A5008605509 @default.
• W2321316415 hasAuthorship W2321316415A5016265728 @default.
• W2321316415 hasConcept C121332964 @default.
• W2321316415 hasConcept C147597530 @default.
• W2321316415 hasConcept C151730666 @default.
• W2321316415 hasConcept C153202636 @default.
• W2321316415 hasConcept C159985019 @default.
• W2321316415 hasConcept C185592680 @default.
• W2321316415 hasConcept C192562407 @default.
• W2321316415 hasConcept C195702682 @default.
• W2321316415 hasConcept C203036418 @default.
• W2321316415 hasConcept C39353612 @default.
• W2321316415 hasConcept C44228677 @default.
• W2321316415 hasConcept C46141821 @default.
• W2321316415 hasConcept C521977710 @default.
• W2321316415 hasConcept C58018886 @default.
• W2321316415 hasConcept C59593255 @default.
• W2321316415 hasConcept C8010536 @default.
• W2321316415 hasConcept C86803240 @default.
• W2321316415 hasConcept C97355855 @default.

• next