Reliable Measurements of the Nylon 6 Glass Transition Made Possible by the New Dynamic DSC

Khanna, Y. P.; Kuhn, William P.; Sichina, W. J.

doi:10.1021/ma00112a008

Cited by 64 publications

(47 citation statements)

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“…If one disregards sample differences, e.g. molecular weight which was not given by Khanna et al [26], then their results imply that T g of 319.6 K for commercial nylon-6 at 1 atm [14] (Fig. 4) corresponds to a water content of ca.…”

Section: Glass Transition Behavior Of Nylon-6 and Mwcnt/nylon-6 Compomentioning

confidence: 88%

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Thermal properties and transition studies of multi-wall carbon nanotube/nylon-6 composites

Tonpheng

Gröbner

et al. 2011

Carbon

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Section: Glass Transition Behavior Of Nylon-6 and Mwcnt/nylon-6 Compomentioning

confidence: 88%

“…It is well known that the moisture content significantly affects T g of nylon-6, which has been studied in detail by Khanna et al. [26]. If one disregards sample differences, e.g.…”

Section: Glass Transition Behavior Of Nylon-6 and Mwcnt/nylon-6 Compomentioning

confidence: 99%

Thermal properties and transition studies of multi-wall carbon nanotube/nylon-6 composites

Tonpheng

Gröbner

et al. 2011

Carbon

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“…Data such as those in Figure 4(c) show that the oriented segments relax at a higher temperature (T g $ 80-90 8C) than the unoriented segments (T g $ 30-50 8C). 62 The higher T g fraction is called the rigid amorphous fraction (RAF), [63][64][65] and the lower T g fraction corresponds to the conventional amorphous fraction. It is sometimes thought that the RAF is at the fold surface of the lamellae.…”

Section: Glass Transitionmentioning

confidence: 99%

Hydrogen bonding, mobility, and structural transitions in aliphatic polyamides

Murthy

2006

J Polym Sci B Polym Phys

222

197

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Some salient results in nylon research are reviewed to identify the fundamental principles that are applicable to other strongly interacting or hydrogenbonded polymers, including proteins. The effects of hydrogen bonds on stress-, heat-, and solvent-induced changes in macroscopic properties are discussed. These data provide a window into the chain mobility and linkages between the crystalline and amorphous domains, both of which are important for any predictive model. The changes in the characteristics of the amorphous phase with the crystallinity and orientation require that it be modeled with at least two components: a rigid/immobile/ anisotropic component and a soft/ mobile/isotropic component. The deformation and shrinkage behavior of these polymers are discussed in terms of the relative contributions of the amorphous and crystalline domains and of the interactions between them. The premelting crystalline transition is accompanied by the merging of intersheet and intrasheet diffraction peaks in some nylons, as observed by Brill, and not in others even though the underlying mechanism that gives rise to these transitions, the onset of volume-increasing librational motion of the crystalline stems, is the same. Because the effects of the temperature, deformation, and solvent have a common origin associated with mobility, a fictive temperature can be associated with a given solvent activity or stress level. The magnitude of this fictive temperature is the amount by which the glass or Brill transition temperature is reduced in the presence of solvents ($50 8C) or stress or by which the annealing temperature can be reduced in the presence of a solvent (or active stress) to achieve the same structural state as that of a dry (or static) polymer.

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“…Thus, for PA-6, Khanna et al found that: T g % 326-0.168w-6.208Hw. 36,37 The most often cited value for dry PA-6 is T g % 327 K. 38,39 Furthermore, T g depends on the residual stresses and annealing. 40 In the present case, T g was difficult to detect as the starting temperature for PVT measurements (30 C) was close to the transition.…”

Section: Solid State Region At T < T Mmentioning

confidence: 99%

Equations of state for polyamide‐6 and its nanocomposites. 1. Fundamentals and the matrix

Utracki

2008

J Polym Sci B Polym Phys

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The pressure‐volume‐temperature (PVT) surface of polyamide‐6 (PA‐6) was determined in the range of temperature T = 300–600 K and pressure P = 0.1–190 MPa. The data were analyzed separately for the molten and the noncrystalline phase using the Simha‐Somcynsky (S‐S) equation of state (eos) based on the cell‐hole theory. At Tg(P) ≤ T ≤ Tm(P), the “solid” state comprises liquid phase with crystals dispersed in it. The PVT behavior of the latter phase was described using Midha‐Nanda‐Simha‐Jain (MNSJ) eos based on the cell theory. The data fitting to these two theories yielded two sets of the Lennard‐Jones interaction parameters: ε*(S‐S) = 34.0 ± 0.3 and ε*(MNSJ) = 22.8 ± 0.3 kJ/mol, whereas v*(S‐S) = 32.00 ± 0.1 and v*(MNSJ) = 27.9 ± 0.2 mL/mol. The raw PVT data were numerically differentiated to obtain the thermal expansion and compressibility coefficients, α and κ, respectively. At constant P, κ followed the same dependence on both sides of the melting zone near Tm. By contrast, α = α(T) dependencies were dramatically different for the solid and molten phase; at T < Tm, α linearly increased with increasing T, then within the melting zone, its value step‐wise decreased, to slowly increase at higher temperatures. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 299–313, 2009

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Reliable Measurements of the Nylon 6 Glass Transition Made Possible by the New Dynamic DSC

Cited by 64 publications

References 0 publications

Thermal properties and transition studies of multi-wall carbon nanotube/nylon-6 composites

Thermal properties and transition studies of multi-wall carbon nanotube/nylon-6 composites

Hydrogen bonding, mobility, and structural transitions in aliphatic polyamides

Equations of state for polyamide‐6 and its nanocomposites. 1. Fundamentals and the matrix

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