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Using Successive Self-Nucleation and Annealing to Detect the Solid-Solid Transitions in Poly(hexamethylene carbonate) and Poly(octamethylene carbonate)
BSRF用户
2021
Source PublicationMACROMOLECULES
ISSN0024-9297
EISSN1520-5835
Volume54Issue:20Pages:9670--9680
SubtypeArticle
AbstractSolid-solid transitions in poly(hexamethylene carbonate) (PC6) and poly(octamethylene carbonate) (PCS), denoted the delta to alpha transition, have been investigated, using self-nucleation and the successive self-nucleation and annealing (SSA) technique. The SSA protocol was performed in situ for thermal (differential scanning calorimetry (DSC)), structural (wide-angle X-ray scattering (WAXS)), and conformational (Fourier transform infrared spectroscopy (FT-IR)) characterization. The final heating after SSA fractionation displayed an enhanced (compared to a standard second DSC heating scan) endothermic and unfractionated peak signal at low temperatures corresponding to the delta to alpha transition. The improved (i.e., higher enthalpy and temperature than in other crystallization conditions) delta to alpha transition signal is produced by annealing the thickest lamellae made up by alpha and beta phase crystals after SSA treatment. As thicker lamellae are annealed, more significant changes are produced in the delta to alpha transition, demonstrating the transition dependence on crystal stability and, thus, on the crystallization conditions. The ability of SSA to significantly enhance the observed solid-solid transitions makes it an ideal tool to detect and study these types of transitions. In situ WAXS reveals that the delta to alpha transition corresponds to a change in the unit cell dimensions, evidenced by an increase in the d-spacing. This implies a more efficient chain packing in the crystal, for both samples, in the delta phase (lower d-spacing at low temperatures) than in the a phase (higher d-spacing at high temperatures). The chain packing differences are explained through in situ FT-IR measurements that show the transition from ordered (delta phase) to disordered (alpha phase) methylene chain conformations.
DOI10.1021/acs.macromol.1c01856
Indexed BySCI ; ADS
Language英语
WOS Research AreaPolymer Science
WOS SubjectPolymer Science
WOS IDWOS:000711772900041
ADS Bibcode2021MaMol..54.9670P
ADS URLhttps://ui.adsabs.harvard.edu/abs/2021MaMol..54.9670P
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2021MaMol..54.9670P/citations
ItemNoBSRF00901
beamline1W2A
Citation statistics
Cited Times:0 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/293669
Collection北京同步辐射装置
Recommended Citation
GB/T 7714
BSRF用户. Using Successive Self-Nucleation and Annealing to Detect the Solid-Solid Transitions in Poly(hexamethylene carbonate) and Poly(octamethylene carbonate)[J]. MACROMOLECULES,2021,54(20):9670--9680.
APA BSRF用户.(2021).Using Successive Self-Nucleation and Annealing to Detect the Solid-Solid Transitions in Poly(hexamethylene carbonate) and Poly(octamethylene carbonate).MACROMOLECULES,54(20),9670--9680.
MLA BSRF用户."Using Successive Self-Nucleation and Annealing to Detect the Solid-Solid Transitions in Poly(hexamethylene carbonate) and Poly(octamethylene carbonate)".MACROMOLECULES 54.20(2021):9670--9680.
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