Polymorphism in nylon 12

Northolt, M. G.; Tabor, B. J.; Aartsen, J. J. Van

doi:10.1002/pol.1972.160100114

Cited by 51 publications

(42 citation statements)

References 5 publications

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“…Intensity of this reflection increases slightly on temperature and time of annealing, although even for prolonged thermal treatment the intensity is much lower than that of observed for pressure-crystallized nylon 12 (2). Presence of the 3.90 A reflection as well as the SAXS measurements show that the hydrogen bonds existed initially in the sample were broken and at least a part of new hydrogen bonds has been formed between antiparallel chains what is characteristic for the a-crystalline modification (6,14).…”

Section: Melting Characteristics Of Nylon 12mentioning

confidence: 53%

Effect of annealing on thermal properties and crystalline structure of polyamides. Nylon 12 (polylaurolactam)

Gogolewski

Czerntawska

Gastorek

1980

Colloid Polymer Sci

136

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Section: Melting Characteristics Of Nylon 12mentioning

confidence: 53%

Effect of annealing on thermal properties and crystalline structure of polyamides. Nylon 12 (polylaurolactam)

Gogolewski

Czerntawska

Gastorek

1980

Colloid Polymer Sci

136

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“…This change can be better represented by producing a graph of temperature versus E 0 , E 1 , f 0 or f 1 from which the transition can be best observed (see Figs. [10][11][12][13]. Trend lines were used to illustrate the change in the constants either side of the glass transition.…”

Section: Temperature Dependencementioning

confidence: 99%

“…This model thus does not fully describe the temperature dependent uniaxial behaviour of Nylon 12 and different models must be employed above and below glass transition. This was achieved by determining the constants E T0 , E T1 , f T0 and f T1 using equations (11) and (12). These constants now allow for the predication of the uniaxial tensile behaviour of Nylon 12 in the total temperature range studied in this analysis, providing the constants are adjusted once the glass transition is exceeded.…”

Section: Temperature Dependencementioning

confidence: 99%

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Uniaxial tensile viscoelastic and viscoplastic behaviour of Nylon 12 at constant strain rate

McFerran¹,

Armstrong²,

McNally³

2006

Plastics, Rubber and Composites

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Tensile tests with constant crosshead speeds ranging from 5 to 200 mm min 21 were performed on Nylon 12 in the temperature range, 25 to 140uC. A modified form of the constitutive equations derived by Drozdov and Yuan were used to describe the time dependant response of Nylon 12 at isothermal deformation and small strains. Reasonable agreement was observed between the experimental data and the numerical calculations. A relationship between the materials constants derived for the uniaxial stress strain behaviour and temperature was found to exist. This is shown to satisfactorily calculate the constants required to accurately predict the stress strain behaviour of Nylon 12 at a specific strain rate and temperature.

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“…Figure 6 gives the typical X-ray diffraction patterns of meta-aramid fiber blends. The observed diffraction peak of the untreated and treated samples were the strong centered reflections [26] which were characterized by the 2θ about 23.5 o and 27.18 o , respectively. Besides these two reflections, there was an extra strong reflection at 2θ of 7.12 o .…”

Section: Effect Of Temperature On the Crystal Structure Of Metaaramidmentioning

confidence: 98%

An investigation for the performance of meta-aramid fiber blends treated in supercritical carbon dioxide fluid

Zheng

Zhang

et al. 2015

Fibers Polym

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The physicochemical performance of meta-aramid fiber blends treated in supercritical carbon dioxide fluid was studied at different temperatures. The effects of treatment temperatures on the surface morphology, wettability, chemical and crystal structures, thermal and antistatic properties were investigated by employing Scanning electron microscopy, Dynamic wetting measurements, Fourier transform infrared spectrometry, X-ray diffraction, Thermal analysis and Static half period method, respectively. The result showed that the surface of the treated meta-aramid fiber blends was changed with the treatment temperature increasing and more mild grooves and stripes appeared. The dynamic wetting measurements showed that the water contact angles and absorption time for treated fibers were decreased with temperature increasing. The slight shifts of the characteristic bands of the treated meta-aramid fiber blends were observed in FT-IR spectra with the system temperature increasing. Meanwhile, XRD analysis showed that the diffraction intensities of treated samples were improved in the supercritical carbon dioxide fluid because some re-arrangements and re-crystallizations of the molecule chains generated. TG-DTG analysis indicated that the thermal property of meta-aramid fiber blends could be improved at various temperatures. In addition, supercritical carbon dioxide fluid had little negative influence on the physical and antistatic properties of the meta-aramid fiber blends.

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Polymorphism in nylon 12

Cited by 51 publications

References 5 publications

Effect of annealing on thermal properties and crystalline structure of polyamides. Nylon 12 (polylaurolactam)

Effect of annealing on thermal properties and crystalline structure of polyamides. Nylon 12 (polylaurolactam)

Uniaxial tensile viscoelastic and viscoplastic behaviour of Nylon 12 at constant strain rate

An investigation for the performance of meta-aramid fiber blends treated in supercritical carbon dioxide fluid

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