Dependence of segmental orientation on polymer conformational characteristics

Haliloğlu, Türkan; Erman, Burak; Bahar, İvet

doi:10.1016/0032-3861(95)90995-e

Cited by 3 publications

(4 citation statements)

References 13 publications

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“…For convenience in comparison with the of this paper, we have replaced the second Legendre polynomial with the appropriate order parameter, formally equivalent for our choice of coordinates. More elaborate treatments have been published; 34 for the purpose of this communication, however, the original model is perfectly adequate.…”

Section: Resultsmentioning

confidence: 99%

“…For a uniaxial deformation and a vector attached to a network chain “in the chain direction”, Kuhn and Grün , found that the second Legendre polynomial of the cosine of the angle between this vector and the direction of deformation obeys the relationship where λ = 1 + ε is the extension ratio and N x , is the mean chain length between cross-links, measured in number of Kuhn segments (i.e., equivalent freely-jointed segments). For convenience in comparison with the rest of this paper, we have replaced the second Legendre polynomial with the appropriate order parameter, formally equivalent for our choice of coordinates.More elaborate treatments have been published; for the purpose of this communication, however, the original model is perfectly adequate.…”

Section: Resultsmentioning

confidence: 99%

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Orientation of Molecular Segments by Plastic Deformation of Glassy Polycarbonate

Utz¹,

Tomaselli²,

Ernst³

et al. 1996

Macromolecules

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Annealed, selectively 13C-labeled Bisphenol A polycarbonate samples were uniaxially compressed (compressive strain ca. 40%). One-dimensional static NMR spectra of the deformed samples were recorded at different orientations with respect to the magnetic field. The orientational distributions of the carbonate groups and the phenylene rings were determined through a fitting of the spectra by an expansion in Wigner rotation matrix elements. The data are explained quantitatively by an affine network-deformation model. The chains qualitatively behave as compressed random coils.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Orientation of Molecular Segments by Plastic Deformation of Glassy Polycarbonate

Utz¹,

Tomaselli²,

Ernst³

et al. 1996

Macromolecules

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“…Finally, the physical properties of the extruded fibers under the respective conditions were comparatively analyzed according to the draw ratio. It can be predicted through the major physical property changes that occur due to the difference in the degree of orientation according to changes in fiber draw ratios [ 30 , 31 ]. This study opens new possibilities for developing and applying environmentally friendly TPUs.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Thermoplastic Polyurethanes Containing Bio-Based Polyester Polyol and Their Fiber Property

Kim

Hwang

et al. 2022

Polymers

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Among the starting materials of thermoplastic polyurethanes (TPUs), it was confirmed that succinic acid-based polyester biopolyols having different molecular weights (Mn = 1000, 2000, and 4000) affect the physicochemical properties of the final polymer significantly. Bio-TPUs synthesized through a solvent-free one-shot polymerization process were synthesized with a polyester polyol, 1,4 butanediol (BDO), and 4,4′-methylene diphenyl diisocyanate (MDI) in a molar ratio of 1:1:2. As a control group, one typical petroleum-based TPU was synthesized and characterized along with other bio-based TPUs. Representative petroleum-based and bio-based TPUs synthesized were manufactured as monofilaments with a diameter of about 0.2 mm through an extrusion process with different draw ratios (4, 5, and 6 times). The molecular weight and structural properties of the TPUs were characterized by GPC and FT-IR analysis and thermal characterization by DSC and TGA analysis. Petroleum-based TPU and bio-based TPU having the same molecular weight soft segment (SS) tended to have similar molecular weight and hard segment (HS) content. TPUs with high HS content had excellent thermal stability, enabling stable extrusion of TPUs. In addition, it was confirmed that the bio-based TPU fibers produced in this way had a tensile strength corresponding to the physical properties of petroleum-based TPU fibers and an excellent elastic recovery rate of almost 100 %. These results indicate the application potential of bio-TPU.

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“…represents the angle between u and T . For a given chain structure, the second order moments (r2)o and (r2 cos2 0 ) o appearing in the front factor DO may be calculated by various theoretical schemes, among which is the rotational isomeric state formalism [9,6,15] and by Monte Carlo simulations[10,11]. The configurational factor has been shown to be inversely proportional to chain length, which is conveniently expressed as DO -1/n where n is the number of bonds in the network chain.For a freely jointed chain with N bonds, or for a real chain approximated by a freely jointed chain of N equivalent bonds (N 5 n), the front factor equates to 1/5N, as was originally shown by Kuhn and Griin [12] and later elaborated by Roe and Krigbaum [13] and Jarry and Monnerie [14].…”

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confidence: 99%