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dc.contributor.authorLiu, Xinran
dc.contributor.authorWang, Yu
dc.contributor.authorWang, Zefan
dc.contributor.authorCavallo, Dario
dc.contributor.authorMüller Sánchez, Alejandro Jesús ORCID
dc.contributor.authorZhu, Ping
dc.contributor.authorZhao, Ying
dc.contributor.authorDong, Xia
dc.contributor.authorWang, Dujin
dc.identifier.citationPolymer 188 : (2020) // Article ID 122117es_ES
dc.description.abstractThe effect of hydrogen bonding stability on the memory effects in the crystallization of long chain polyamides have been investigated by the self-nucleation calorimetric technique. Self-nucleation is characterized by three domains in decreasing temperature order: complete melting or Domain I, exclusive self-nucleation or Domain II and, self-nucleation and annealing or Domain III. The memory effect is observed in the high temperature range of Domain II (when all crystals are molten, or in Domain IIa). In the low temperature range of Domain II, crystal remnants act as self-seeds (i.e., Domain IIb). The hydrogen bonds between amide groups were detected with FTIR, and a ratio of the content of hydrogen bonded vs. free amide groups could be calculated. The energy needed to break the hydrogen bonds decreases as the self-nucleation temperature (Ts) increases. This means that hydrogen bonds become weaker (and their amount decrease), while the crystalline memory disappears upon crossing from Domain IIa to Domain I. Comparing the widths of Domain IIa in different polyamides, we found for the first time a clear correlation with the relative content of amide groups with respect to methylene groups in the repeat units. In conclusion, we have demonstrated that memory in polyamides is a strong function of hydrogen bonding between chain segments.es_ES
dc.description.sponsorshipThis work was financially supported by the National Natural Science Foundation of China (No. 21574140) and the National Key R&D Program of China (No. 2017YFB0307600). The SSRF beamlines BL16B1 are acknowledged for kindly providing the beam time and assistance. We thank Dr. François Bouéfrom CEA UMR12 Lab Léon Brillouin-Orphée Neutron Reactor for the good discussion and help on this work. We also acknowledge funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 778092.es_ES
dc.subjectCrystalline memoryes_ES
dc.subjectLong chain polyamideses_ES
dc.subjectHydrogen bondinges_ES
dc.titleThe origin of memory effects in the crystallization of polyamides: Role of hydrogen bondinges_ES
dc.rights.holder© 2019 Elsevier This manuscript version is made available under the CC-BY-NC-ND 4.0 license
dc.contributor.funderEuropean Commission
dc.departamentoesCiencia y tecnología de polímeroses_ES
dc.departamentoeuPolimeroen zientzia eta teknologiaes_ES

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© 2019 Elsevier This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Except where otherwise noted, this item's license is described as © 2019 Elsevier This manuscript version is made available under the CC-BY-NC-ND 4.0 license