NDLI: Bio-polyamides based on renewable raw materials : Glass transition and crystallinity studies

Content Provider	Springer Nature Link
Author	Pagacz, Joanna Raftopoulos, Konstantis N. Leszczyńska, Agnieszka Pielichowski, Krzysztof
Copyright Year	2015
Abstract	Structural characterization of a series of novel bio-polyamides based on renewable raw materials—PA 4.10, PA 6.10, PA 10.10, and PA 10.12—was performed by Fourier transform infrared spectroscopy (FTIR) and wide-angle X-ray diffraction (WAXD). Infrared spectra and the WAXD patterns indicate the coexistence of different crystalline forms, α- and γ-triclinic and β-pseudohexagonal. Thermal properties in the glass transition (T $_{g}$) and melting region were then investigated using temperature-modulated DSC (TOPEM$^{®}$ DSC). The melting point (T $_{m}$) was found to increase with increasing amide/methylene ratio in the polymer backbone, which is consistent with the increase in linear density of hydrogen bonds. Studies on the molecular dynamics by dynamic mechanical analysis show three distinct regions associated with the γ- and the β-relaxation and the dynamic glass transition. TOPEM$^{®}$ DSC data reveal that at low frequency/long timescales, the materials with significantly different amide/methylene ratios have similar segmental dynamics.
Starting Page	1225
Ending Page	1237
Page Count	13
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	123
Issue Number	2
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-09-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biopolymers Glass transition Molecular dynamics Differential scanning calorimetry WAXS Polymorphism Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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