General discussion

Point, J. J.; Rault, J.; Hoffman, John D.; Kovacs, A. J.; Mandelkern, L.; Wunderlich, Bernhard; DiMarzio, Edmund A.; Klein, Jens; Ball, Robin C.; Flory, Paul J.; Yoon, Dong-hwan; Guttman, Charles M.; Khoury, F.; Voigt‐Martin, I. G.; Bassett, D. C.; Frank, W.; Atkins, E. D. T.; Booth, Colin; Uhlmann, D. R.; Grubb, D. T.; Magill, J. H.; Veselý, D.; Sadler, D. M.; Keller, A.; Krimm, Samuel; Samulski, Edward T.; Calvert, Paul; Fischer, Edgar; Stamm, Manfred; Geil, P. H.; Ullman, Robert; Ballard, D. G. H.; Rys, Franz S.; Rigby, David L.; Stepto, R. F. T.; Windle, Alan H.; Dill, Kilian; Hearle, J. W. S.; Hendra, P.J.; Ward, I. M.; Stejny, J.; Pennings, A. J.; Boer, A. Posthuma De

doi:10.1039/dc9796800365

Cited by 20 publications

(13 citation statements)

References 5 publications

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“…50 C between their melting temperatures. 27,28 Within the lattice of the P3HT/ P3BT cocrystals, interchain interactions between P3HT and P3BT chains, including P3HT-P3HT, P3BT-P3HT or P3BT-P3BT chains, should be comparable. However, the intrachain property is highly different to make P3HT and P3BT chains respond differently upon heating at the former endothermic region.…”

Section: Resultsmentioning

confidence: 99%

A novel melting behavior of poly(3-alkylthiophene) cocrystals: premelting and recrystallization of component polymers

et al. 2012

Polym. Chem.

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Section: Resultsmentioning

confidence: 99%

A novel melting behavior of poly(3-alkylthiophene) cocrystals: premelting and recrystallization of component polymers

et al. 2012

Polym. Chem.

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“…The chain connectivity has been considered since the beginning of polymer crystallization study. To justify the folded-chain crystal against Flory’s random switchboard model, Frank and others argued that the interlamellar amorphous segments resemble as polymer brush and would cost too much entropy due to surface crowding if the remaining amorphous segments do not fold back into the crystal . A Monte Carlo simulation, performed by Zachmann , in the later 1960s, showed that the entropic loss of the remaining amorphous segments in the fringed-micelle nucleation model can be nearly one order larger than the folded-chain surface free energy σ e .…”

Section: Peculiarities Of Polymer Crystallizationmentioning

confidence: 99%

The Tough Journey of Polymer Crystallization: Battling with Chain Flexibility and Connectivity

2019

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Theoretical approaches addressing the mechanism of polymer crystallization remain the great challenge in polymer science. Numerous different, or even conflicting, models/theories have been proposed during the past several decades. However, none of them can fully satisfy the whole community. In this Perspective, we first trace the roots of these models/ theories back to the classical and nonclassical nucleation theories. The correlation between these theories and milestone theoretical works in polymer crystallization is elucidated together with their intrinsic drawbacks. Then the newly proposed two-step nucleation scenarios, with either bondorientational order or density fluctuation as precursors, are introduced, which, in our view, may stimulate the development of polymer crystallization theory. Afterward, the peculiarities of polymer crystallization due to chain flexibility and connectivity are discussed. A personal outlook on the ultimate polymer crystallization theory is given at last, which is suggested to address the following three questions: (i) How do flexible chains transform into rigid conformational ordered segments? (ii) How do interlamellar amorphous layers form? (iii) Are polymer chains dragged by force to the growth front? Answering these questions may eventually end the tough journey for the establishment of polymer crystallization theory, though polymer crystallization never completes fully.

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“…The plot of the left side of eq against log t allows determining n and K . Deviation from linearity are observed frequently at high conversion, which is ascribed to the start of secondary relaxation, a change in the geometry of crystal growth or a change in the nucleation mechanism in the sense of the Lauritzen‐Hofman theory …”

Section: Resultsmentioning

confidence: 99%

Crystallization kinetics of poly(ethylene oxide) confined in semicrystalline poly(vinylidene) fluoride

Tamaño-Machiavello

Costa

Romero‐Colomer

et al. 2017

J Polym Sci B Polym Phys

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Polymer blends based on poly(vinylidene fluoride) (PVDF) and poly(ethylene oxide) (PEO) have been prepared to analyze the crystallization kinetics of poly(ethylene oxide) confined in semicrystalline PVDF with different ratios of both polymers. Both blend components were dissolved in a common solvent, dimethyl formamide. Blend films were obtained by casting from the solution at 70 8C. Thus, PVDF crystals are formed by crystallization from the solution while PEO (which is in the liquid state during the whole process) is confined between PVDF crystallites. The kinetics of crystallization of the confined PEO phase was studied by isothermal and nonisothermal experiments. Fitting of Avrami model to the experimental DSC traces allows a quantitative comparison of the influence of the PVDF/PEO ratio in the blend on the crystallization behavior. The effect of melting and further recrystallization of the PVDF matrix on PEO confinement is also studied.

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General discussion

Cited by 20 publications

References 5 publications

A novel melting behavior of poly(3-alkylthiophene) cocrystals: premelting and recrystallization of component polymers

A novel melting behavior of poly(3-alkylthiophene) cocrystals: premelting and recrystallization of component polymers

The Tough Journey of Polymer Crystallization: Battling with Chain Flexibility and Connectivity

Crystallization kinetics of poly(ethylene oxide) confined in semicrystalline poly(vinylidene) fluoride

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