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- W2013712870 startingPage "71" @default.
- W2013712870 abstract "A series of low polydispersity cyclic PCL samples (C-PCLs), as well as their linear analogs (L-PCLs), were synthesized by click chemistry in a number average molecular weight (Mn) range of 2–22 kg/mol. They were investigated by Polarized Light Optical Microscopy (PLOM) and Differential Scanning Calorimetry (DSC). The nucleation and overall crystallization kinetics were studied, as well as their self-nucleation behavior and SSA (Successive Self-nucleation and Annealing) thermal fractionation. Cyclic PCLs were found to nucleate and crystallize faster than linear PCLs due to: (a) faster diffusion of C-PCL chains and (b) larger supercoolings of C-PCLs at any given crystallization temperature, as compared to L-PCLs. A bell shape curve was obtained when the overall crystallization rate was examined as a function of Mn, this effect is probably due to a competition between nucleation and diffusion. It was found for the first time, that since cyclic molecules have lower entanglement densities, they can quickly recover their pseudo-equilibrium compact coil conformations upon melting and therefore exhibit much smaller crystalline memory effects than their linear counterparts of identical chain lengths. SSA revealed that C-PCLs are more sensitive to annealing than L-PCLs because their ring topology and limited lamellar chain folding facilitates crystal thickening." @default.
- W2013712870 created "2016-06-24" @default.
- W2013712870 creator A5020214500 @default.
- W2013712870 creator A5025819259 @default.
- W2013712870 creator A5031112462 @default.
- W2013712870 creator A5031675155 @default.
- W2013712870 creator A5042831062 @default.
- W2013712870 creator A5045765749 @default.
- W2013712870 creator A5083472390 @default.
- W2013712870 date "2014-07-01" @default.
- W2013712870 modified "2023-10-16" @default.
- W2013712870 title "Nucleation, crystallization, self-nucleation and thermal fractionation of cyclic and linear poly(ε-caprolactone)s" @default.
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