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• W3030145532 endingPage "122660" @default.
• W3030145532 startingPage "122660" @default.
• W3030145532 abstract "To clarify the effect of triazole (TR) group at the closing point within the cyclic polymer chain on the crystal growth, we studied morphology and the growth rate of spherulite G of cyclic poly(ε-caprolactone) with a TR group at the closing point (C-TR-PCL) as a function of the degree of supercooling ΔT using polarizing optical microscopy. We prepared C-TR-PCLs synthesized by the ring-closing reaction from their linear precursors with Mw = 30000 and 50000, and cyclic PCL polymerized by ring expansion reaction (C-PCL) having no TR group with Mw = 26000, and linear PCL with/without a TR group at a chain end (L-TR-PCL-OH and L-PCL) with Mw = 26000 and 36000, where Mw was determined by GPC using linear polystyrene standards. We found that C-TR-PCL and L-TR-PCL-OH show banded spherulites at small ΔT and band-less normal spherulites with maltese cross at large ΔT. Whereas, C-PCL and L-PCL only showed band-less normal spherulites at any ΔT. This speculates that steric hindrance of TR group near the surface of crystals will become significant at small ΔT. G obeyed the equation, G = G0exp(−B/TΔT), for all the samples. B of C-PCL and L-PCL is constant irrespective of TΔT, however, that of C-TR-PCL and L-TR-PCL-OH showed two values depending on TΔT. At the region of lower B, i.e., small ΔT, the banded spherulites could be observed. The change of B corresponds to the morphological change of the spherulites. Since the size of the crystalline region closely related to lamellar thickness becomes large at small ΔT, TR groups excluded from the crystals become to assemble near the surface of the crystals. This is the reason why B becomes low at small ΔT. In C-TR-PCL with higher Mw and L-TR-PCL-OH, the decrease of B with decreasing ΔT becomes small compared to that of C-TR-PCL with lower Mw due to relatively small effect of TR group." @default.
• W3030145532 created "2020-06-05" @default.
• W3030145532 creator A5047854043 @default.
• W3030145532 creator A5057496723 @default.
• W3030145532 creator A5068231042 @default.
• W3030145532 creator A5077169108 @default.
• W3030145532 creator A5081231413 @default.
• W3030145532 date "2020-08-01" @default.
• W3030145532 modified "2023-10-02" @default.
• W3030145532 title "Morphology and growth rate of spherulite of cyclic poly(ε-caprolactone) having a triazole group at the closing point" @default.
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• W3030145532 doi "https://doi.org/10.1016/j.polymer.2020.122660" @default.
• W3030145532 hasPublicationYear "2020" @default.

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