Characterization of Polymer Deformation by Vibrational Spectroscopy

Siesler, Heinz W.

doi:10.1002/9783527615056.ch4

Cited by 16 publications

(5 citation statements)

References 55 publications

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“…For more detailed information on the characterization of anisotropy in polymers by IR dichroism measurements, the reader is referred to the relevant literature. [8][9][10][11][12] Generalized Two-Dimensional Correlation Spectroscopy. The 2D correlation spectra were calculated by the software ''2Dshige'' (http://sci-tech.ksc.kwansei.ac.jp/;ozaki/).…”

Section: Methodsmentioning

confidence: 99%

“…The experimental and theoretical principles of rheo-optical FT-IR spectroscopy have been described in detail in previous publications. [8][9][10][11] The present study focuses on the monitoring of polymer chain orientation during uniaxial elongation of a PHB/PCL blend by rheo-optical FT-IR spectroscopy. Furthermore, generalized 2D-COS analysis is applied to the spectroscopic data in order to extract more detailed information on the orientational and structural changes of PCL and PHB during the mechanical treatment.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Orientation Studies of a Poly(3-hydroxybutyrate)/Poly(ε-caprolactone) Blend by Rheo-Optical Fourier Transform Infrared Spectroscopy and Two-Dimensional Correlation Spectroscopic Analysis

Unger

Siesler

2009

Appl Spectrosc

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In the present study, the orientation of a poly(3-hydroxybutyrate) (PHB)/poly(epsilon-caprolactone) (PCL) blend was monitored during uniaxial elongation by rheo-optical Fourier transform infrared (FT-IR) spectroscopy and analyzed by generalized two-dimensional correlation spectroscopy (2D-COS). The dichroism of the delta(CH(2)) absorption bands of PHB and PCL was employed to determine the polymer chain orientation in the PHB/PCL blend during the elongation up to 267% strain. From the PHB and PCL specific orientation functions it was derived that the PCL chains orient into the drawing direction while the PHB chains orient predominantly perpendicular to the applied strain. To extract more detailed information about the polymer orientation during uniaxial elongation, 2D-COS analysis was employed for the dichroic difference of the polarization spectra recorded during the drawing process. In the corresponding synchronous and asynchronous 2D correlation plots, absorption bands characteristic of the crystalline and amorphous regions of PHB and PCL were separated. Furthermore, the 2D-COS analysis revealed that during the mechanical treatment the PCL domains orient before the PHB domains.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In Situ Orientation Studies of a Poly(3-hydroxybutyrate)/Poly(ε-caprolactone) Blend by Rheo-Optical Fourier Transform Infrared Spectroscopy and Two-Dimensional Correlation Spectroscopic Analysis

Unger

Siesler

2009

Appl Spectrosc

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“…To validate the different approaches and to better understand the link between the material structure and its physical characteristics, the deformation experiment is critical. However, it is fairly rare that several physical methods are combined together in a particular deformation study 7,8) . Meanwhile stretching calorimetry allows not only mechanical work but the heat accompanying the deformation to be analyzed simultaneously, a contribution which is significant and very important 9,10) .…”

Section: Introductionmentioning

confidence: 99%

Stretching calorimetry and X‐ray characterization of deformational behavior of new high molecular weight propene‐carbon monoxide alternating co‐ and terpolymers

Godovsky

Konyukhova

Чвалун³

et al. 1999

Macromol. Chem. Phys.

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SUMMARY: Structure, properties, and deformation behavior of a high molecular weight propene-CO alternating copolymer (ElPCO 200) and ethene-CO/propene-CO terpolymers (EPEC 1; E-CO = 47% and EPEC 2; E-CO = 69%) were investigated. The terpolymer with high molar ratio of ethene-CO to propene-CO (EPEC 2) is a typical thermoplastic and reveals relatively high crystallinity, while the terpolymer of lower content of ethene-CO groups (EPEC 1) and the propene-CO copolymer (ElPCO 200) exhibit elastomeric behavior. In spite of the possible random stereo-and regioregularity, the propene-CO chains crystallize with regular 3/1 chain conformation. According to X-ray data the synthesized terpolymers consist of blocks of propene-CO segments and blocks enriched with ethene-CO groups. The main structural changes at deformation were studied by means of X-ray diffraction and deformation calorimetry. It is established that the large reversible deformation of the samples studied is determined mostly by the amorphous regions. Deformation calorimetry results, treated according to the modern theory of thermoelasticty of rubber-like materials, showed that the energy contribution (DU/W) V,T and the temperature coefficient of the unperturbed dimension of chains d ln pr 2 P 0 /dT are more negative than for PE and PP, which seems quite reasonable owing to the chemical structure of the 1,4-polyketone macromolecules.

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“…When stretched, they fold in parallel threads. To investigate the elasticity of polymeric materials, Siesler introduced rheo-optical FTIR, 103–105 which enables the recording of IR spectra of elastic materials simultaneous to its stretching and heating or cooling. The theoretical background of the technique has also been well established by the same group.…”

Section: Physical Processesmentioning

confidence: 99%

“…The theoretical background of the technique has also been well established by the same group. 103 The monitoring of the response of specific vibrational bands to an applied force and temperature recover information on the orientation and orientational relaxation in bimodal blends of PMMA, as well as the strain-induced crystallization of the soft segments during cyclic elongation and recovery of polyurethane elastomers. 104 Conjugated polymers have attracted much attention as semiconductive materials for use in flexible devices, but they are generally more rigid than conventional plastics.…”

Section: Physical Processesmentioning

confidence: 99%