Raman spectroscopic characterization and molecular force field development of a synthetic polyamide: nylon 66

Zimba, Carl G.; Rabolt, John F.; English, A. D.

doi:10.1021/ma00196a061

Cited by 46 publications

(31 citation statements)

References 10 publications

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“…The 539 cm -1 sharp band is related to a transplanar structure [13] in amorphous region of sPS, while the weak band at 1 222 cm -1 is associated with long transsequences in the crystalline phase. [12] The band of medium intensity has also been observed at 903 cm -1 for the a form of sPS. [13] However, the specific bands for b-form at 911 cm -1 are not easily defined.…”

Section: Crystal Formsmentioning

confidence: 87%

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Polymorphic Crystals and Melting Behavior of sPS/iPP Blends Prepared by Polymerization

Hu³

2002

Macromol. Chem. Phys.

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Section: Crystal Formsmentioning

confidence: 87%

“…The bands at 499, 548, 571, 939 and 943 cm -1 assigned to the helical conformation in the sPS crystalline phase are not present. [12,13] Compared with those in the neat sPS, the crystal forms of sPS in blends do not change markedly. It can be concluded that samples of neat sPS and blends processed at 290 8C mainly exist in the a forms.…”

Section: Crystal Formsmentioning

confidence: 94%

Polymorphic Crystals and Melting Behavior of sPS/iPP Blends Prepared by Polymerization

Hu³

2002

Macromol. Chem. Phys.

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“…Recently, subjects of polymorphism of sPS have been widely investigated by using differential scanning calorimetry (DSC), [1,2] X-ray diffraction, [3][4][5] transmission electron microscopy, electron diffraction, [6][7][8] Raman scattering and Fourier-transform infrared spectroscopy (FTIR), [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] etc. There are four known crystals (a-, b-, d-, and g-crystals) in sPS.…”

Section: Introductionmentioning

confidence: 99%

“…b-type) which can occur upon annealing the solution-cast sPS samples. [3,4,[11][12][13] Infrared absorbance peaks are quite sensitive to intermolecular interactions between polymers and solvents or polymerpolymer and to the ordered states of polymer chains. Thus, the crystal phases and chain conformations in the polymersolvent complexes or polymer crystals can be effectively analyzed using FTIR spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the crystal phases and chain conformations in the polymersolvent complexes or polymer crystals can be effectively analyzed using FTIR spectroscopy. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] Fourier-transform infrared spectroscopy (FTIR) technique has been commonly and widely used to investigate crystal polymorphism and chain conformations in semicrystalline polymers, [18][19][20][21][22][23] and numerous applications have been demonstrated on investigating the vibrational spectra changes with polymorphism alteration in sPS during various solvent/thermal treatments. By using X-ray diffraction characterization, the preliminary evidences show the different phase transition mechanisms for various polymer-solvent complexes depending on the type of the solvent included in the crystal of the d-type.…”

Section: Introductionmentioning

confidence: 99%

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Thermal‐Induced Crystal/Conformation Transformations in Syndiotactic Polystyrene Films Treated with Different Solvents

Sun

Woo

2003

Macro Chemistry & Physics

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Solution‐crystallized or solvent‐induced crystal forms and transitions of these crystals upon post‐annealing in solvent‐treated syndiotactic polystyrene (sPS) (films cast from o‐dichlorobenzene or immersed in 1,2‐dichloroethane, respectively) were investigated via wide‐angle X‐ray diffraction (WAXD), differential scanning calorimetry (DSC), and Fourier‐transform infrared (FTIR) spectroscopy. IR spectra in the frequency range of 720–820 cm−1, which is attributed to the CH out‐of‐plane bending of the phenyl ring for neat syndiotactic polystyrene (sPS) and their crystal/solvent complexes (sPS/o‐dichlorobenzene or sPS/1,2‐dichloroethane), were examined for the freshly as‐cast samples in comparison with those having been subjected to post‐annealing by heating to high temperatures. Three bands centered at approximately 779, 769, and 750 cm−1 were observed, the intensity and wavenumber being sensitive to the helical structural changes as a function of the annealing temperature. The band at 769 cm−1, being associated with the intramolecular interactions of the helical chains of the γ‐crystal, was used to confirm the formation of such a phase. The bands at 779 cm−1 and 769 cm−1 disappeared and the sharper band at 750 cm−1 remained upon further annealing above the γ → α′ transition temperature. Thus, by examining the temperature dependency as revealed in the IR spectra, the thermal‐induced phase transition from the δ‐ to an ordered γ‐ and then to an α′‐phase was successfully proven for the sPS/o‐dichlorobenzene complex. Similarly, the other sPS/1,2‐dichloroethane complex underwent transition (from a δ‐ to a disordered γ‐ and then to an α′‐phase) upon the same thermal treatments, except that the intermediate phase is a disordered γ‐phase.FTIR spectra in the frequency ranging from 720 to 820 cm−1 for the δ‐type sPS/o‐dichlorobenzene complex subjected to increase of the temperature by 5 °C steps in the range of 60–245 °C.magnified imageFTIR spectra in the frequency ranging from 720 to 820 cm−1 for the δ‐type sPS/o‐dichlorobenzene complex subjected to increase of the temperature by 5 °C steps in the range of 60–245 °C.

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Syndiotactic Polystyrene

Tomotsu¹

2011

Encyclopedia of Polymer Science and Technology

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Syndiotactic polystyrene (sPS) is a semicrystalline polymers with a high melting point and rapid crystallization rate, which makes it possible to injection mold the material. The stereospecific polymerization is made possible by the combination of a transition metal catalyst with weakly coordinating cocatalysts, such as methylaluminoxane or compounds with tetrapentafluorophenylborate. The excellent balance of mechanical, electrical, solvent resistant, and dimensional stability properties combined with a relatively low price (based on the styrene monomer) have made this material a competitor to existing engineering plastics. The products also have excellent heat performance and are finding application in automotive (under the hood), electrical, and electronic connector systems.

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Raman spectroscopic characterization and molecular force field development of a synthetic polyamide: nylon 66

Cited by 46 publications

References 10 publications

Polymorphic Crystals and Melting Behavior of sPS/iPP Blends Prepared by Polymerization

Polymorphic Crystals and Melting Behavior of sPS/iPP Blends Prepared by Polymerization

Thermal‐Induced Crystal/Conformation Transformations in Syndiotactic Polystyrene Films Treated with Different Solvents

Syndiotactic Polystyrene

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