期刊
POLYMER
卷 228, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2021.123875
关键词
Supramolecular polymer; Hydrogen bonds; Ureidopyrimidinone (UPy); Correlation distance; Crystal phase; SAXS
资金
- University of Lille
- Ministere de l'Enseignement Superieur de la Recherche et de l'Innovation
- region Hauts-de-France
- ERDF program of the European Union
- Metropole Europeenne de Lille
The structural evolution of a supramolecular copolymer assembly based on multiple hydrogen bonds was investigated through in situ WAXS and SAXS experimentation. The impact of the hydrogen bonding network on structural arrangements was highlighted, with special attention to the crystallinity and crystal forms associated with ethylene sequences. Crystalline domains with an in-plane arrangement between neighboring UPy dimers were detected up to 80 degrees C.
The structural evolution as a function of temperature of a supramolecular copolymer assembly based on multiple hydrogen bonds has been investigated. Ureidopyrimidinone functionalized semi-crystalline poly(ethylene-cobutylene) (PEB-(L-UPy)2) has been characterized by means of in situ WAXS and SAXS experiments. The crystallinity and the nature of crystal forms are associated to the ethylene sequences. Special attention has been paid to the impact of the hydrogen bonding network on the structural arrangements, by comparison to the unfunctionalized PEB. The presence of crystalline domains of in-plane arrangement between neighboring UPy dimers is detected by WAXS up to 80 degrees C. The SAXS data reflect the presence of L-UPy aggregates stable on the whole temperature range. The correlation of these UPy-based aggregates is effective until the PEB crystal melting temperature (Tm). Beyond Tm, the increase of the macromolecular mobility reduce the number of domains in interaction and, in consequence, implies a decorrelation of the aggregates.
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