Structural Changes and Crystallization Dynamics of Poly(l-lactide) during the Cold-Crystallization Process Investigated by Infrared and Two-Dimensional Infrared Correlation Spectroscopy

2004 ◽  
Vol 37 (17) ◽  
pp. 6433-6439 ◽  
Author(s):  
Jianming Zhang ◽  
Hideto Tsuji ◽  
Isao Noda ◽  
Yukihiro Ozaki
Keyword(s):  
Structural Changes ◽  
Crystallization Process ◽  
Correlation Spectroscopy ◽  
Cold Crystallization ◽  
Two Dimensional ◽  
Crystallization Dynamics

scholarly journals Vibrational Dynamics of a Chiral Smectic Liquid Crystal Undergoing Vitrification and Cold Crystallization

Crystals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 655 ◽  
Author(s):  
Anna Drzewicz ◽  
Ewa Juszyńska-Gałązka ◽  
Wojciech Zając ◽  
Przemysław Kula
Keyword(s):  
Density Functional ◽  
Crystallization Process ◽  
Cold Crystallization ◽  
Two Dimensional ◽  
Absorption Bands ◽  
Functional Theory ◽  
Vibrational Dynamics ◽  
Smectic Liquid Crystal ◽  
Spectra Processing ◽  
Experimental Runs

Vibrational dynamics in the glass transition and the cold crystallization process of (S)-4′-(1-methyloctyloxycarbonyl) biphenyl-4-yl 4-[7-(2,2,3,3,4,4,4-heptafluorobutoxy) heptyl-1-oxy]-benzoate (3F7HPhH7) was studied by Fourier transform infrared spectroscopy (FTIR) during cooling/heating experimental runs. The measured spectra processing was supported by quantum chemical density functional theory (DFT) calculations (frequency assignments). The perturbation-correlation moving window two-dimensional analysis (PCMW2D) was performed to examine how the height of individual absorption bands change under with temperature. Two-dimensional correlation analysis (2D-COS) was used to detect freezing-in or activation of the stochastic movements during the vitrification and the cold crystallization processes. Upon cooling, the vitrification process involves freezing-in of the stochastic movements of ester groups. Upon heating, as the cold crystallization process begins, the first to respond are the vibrations of the C–O–C and C=O groups in the rigid core.

Imidization induced structural changes of 6FDA-ODA poly(amic acid) by two-dimensional (2D) infrared correlation spectroscopy

2014 ◽  
Vol 1069 ◽  
pp. 196-199 ◽  
Author(s):  
Hyemi Seo ◽  
Boknam Chae ◽  
Ji Hyuk Im ◽  
Young Mee Jung ◽  
Seung Woo Lee
Keyword(s):  
Structural Changes ◽  
Amic Acid ◽  
Correlation Spectroscopy ◽  
Two Dimensional

Two-dimensional Raman correlation spectroscopy reveals molecular structural changes during temperature-induced self-healing in polymers based on the Diels–Alder reaction

2015 ◽  
Vol 17 (35) ◽  
pp. 22587-22595 ◽  
Author(s):  
R. Geitner ◽  
J. Kötteritzsch ◽  
M. Siegmann ◽  
T. W. Bocklitz ◽  
M. D. Hager ◽  
...  
Keyword(s):  
Correlation Analysis ◽  
Structural Changes ◽  
Alder Reaction ◽  
Diels Alder ◽  
Correlation Spectroscopy ◽  
Self Healing ◽  
Two Dimensional ◽  
Diels Alder Reaction ◽  
First Time ◽  
Raman Correlation Spectroscopy

For the first time two-dimensional Raman correlation analysis has been used to study self-healing polymers based on the Diels–Alder reaction.

EXPRESS: Two-Trace Two-Dimensional Correlation Spectroscopy (2T2D-COS) Study of the Crystallization Behavior of Bioplastics

2021 ◽  
pp. 000370282110141
Author(s):  
Isao Noda
Keyword(s):  
Crystallization Behavior ◽  
Crystallization Process ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
Difference Spectra ◽  
Amorphous Component ◽  
Fundamental Properties ◽  
Intensity Changes ◽  
Copolymer Poly ◽  
Primary Crystals

A pair of ATR IR spectra obtained during the crystallization of bioplastic copolymer poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate] or PHBHx from the melt by spontaneous cooling were examined using the two-trace two-dimensional correlation spectroscopy (2T2D-COS) analysis. Unlike conventional difference spectra, 2T2D spectra showed unexpected details for the patterns of spectral intensity changes, clearly revealing the existence of two distinct populations of crystalline contributions, attributed to the well-ordered primary crystals and the less ordered secondary crystals, in addition to the amorphous component. The 2T2D spectrum sorts out highly overlapped bands associated with different constituents of the system, based on the fundamental properties and constraint imposed on a pair of spectra. Hetero-mode asynchronous 2T2D correlation analysis between the congested CH-stretching region and better resolved carbonyl-stretching region further indicates that the increase in the intensities of certain methyl and methylene bands during the crystallization process is mostly associated with the growth of the well-ordered primary crystals of PHBHx instead of the formation of the secondary crystals in the confined inter-lamellar space.

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