Structural and mechanical behavior of nylon 6 films part I. Identification and stability of the crystalline phases

Penel‐Pierron, L.; Depecker, C.; Séguéla, Roland; Lefebvre, Jean‐Marc

doi:10.1002/1099-0488(20010301)39:5<484::aid-polb1022>3.0.co;2-r

Cited by 144 publications

(75 citation statements)

References 49 publications

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“…Ramesh et al [36] demonstrated that γ phase crystal was very stable and did not show any crystalline transition after thermal treatment at any temperature below its melting point. However, β phase crystal can transform to α phase when annealed at 190℃ [31] . The three kinds of as-spun fibers were all immersed into boiling water for 30 min, and then characterized by XRD as shown in Figure 1 (solid lines).…”

Section: The β Phase Crystal Formed During the Spinning Processsupporting

confidence: 83%

“…Further investigations using the FT-IR method were carried out on the fibers, since it is reported [31,34] that FT-IR spectra are advantageous for discrimination between β and γ phases. The FT-IR results for ASF1, ASF2 and ASF3 are shown in Figures 2(a)-2(c) with the characteristic peaks at 976 cm −1 for all the three fiber samples.…”

Section: The β Phase Crystal Formed During the Spinning Processmentioning

confidence: 96%

“…Among the three fiber samples, ASF3 which was crystallized in the form of standard γ phase shows a very narrow and sharp characteristic peak at 976 cm −1 (Figure 2(c)), while both of ASF1 and ASF2 exhibit much broader characteristic peaks at around 976 cm -1 (Figures 2(a) and 2(b)). The FT-IR spectra of ASF1 and ASF2 are quite similar to that of the β phase as reported in the literature [31,34] . As a matter of fact, most of the as-spun fibers obtained without further chemical or mechanical treatment show broad characteristic peaks at 976 cm −1 .…”

Section: The β Phase Crystal Formed During the Spinning Processmentioning

confidence: 99%

“…As a matter of fact, there does exist an intermediate or meta-stable β phase of PA6, which has different structure and accordingly different mechanical and thermal stability in comparison with the two well recognized crystalline forms. Seguela, Lefebvre et al [31,34] investigated the PA6 films dominated by β phase, which can be obtained by quenching molten PA6 films. It is difficult to differentiate the β phase from the γ phase from their XRD patterns, since both β and γ phases show a single characteristic peak located at about 21.5°.…”

Section: Introductionmentioning

confidence: 99%

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Crystalline behaviors and phase transition during the manufacture of fine denier PA6 fibers

Zhang

Liu

et al. 2009

Sci. China Ser. B-Chem.

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Recently we have successfully produced fine denier PA6 fibers by using additives containing lanthanide compounds. Meanwhile, crystallization and phase transition of PA6 fibers during spinning and drawing processes were investigated. During the spinning process, β phase crystal could be obtained in as-spun PA6 fibers which were produced with relatively high melt draw ratio, while γ phase crystal predominated when the melt draw ratio was relatively low. β phase crystal, whose behaviors are similar with those of γ phase by FT-IR and XRD characterization, could be transformed to α form easily when PA6 fibers are immersed in boiling water. However, γ phase crystal of PA6 remains unchanged in boiling water. Thus, β and γ phase crystals of PA6 can be differentiated by the crystalline behaviors of PA6 fibers after treatment in boiling water. Further experiments demonstrate that the β phase can also be produced during a drawing process where a phase transformation from γ to α occurs. In other words, β phase may act as an intermediate state during the phase transformation.

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Section: The β Phase Crystal Formed During the Spinning Processsupporting

confidence: 83%

Section: The β Phase Crystal Formed During the Spinning Processmentioning

confidence: 96%

Section: The β Phase Crystal Formed During the Spinning Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Crystalline behaviors and phase transition during the manufacture of fine denier PA6 fibers

Zhang

Liu

et al. 2009

Sci. China Ser. B-Chem.

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“…10b, the GA nanocomposites displayed a double T m at 215 and 220 °C. This result may be attributed to the co-existence of the α and γ crystal structures of PA6 or to the melting-recrystallization process during the second heating scan [56,60,61]. However, the peak shape of T m at 215 °C decreased as the chain length of NH 2 -PEG-NH 2 increased.…”

Section: Crystallization Behaviormentioning

confidence: 99%

Effect of polymer modifier chain length on thermal conductive property of polyamide 6/graphene nanocomposites

Song

Yang

Ding

et al. 2015

Composites Part A: Applied Science and Manufacturing

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Dynamics and structure development for biaxial stretching PA6/MXD6 blend packaging films

2018

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The biaxial stretching film of polyamide 6 (PA6) is widely used for food and industrial products packaging, because it has good physical properties, such as high toughness and gas barrier properties. It is expected to improve gas barrier and easy straight cut performance for a larger market such as food packaging. So, in this research, blends of poly(m‐xylene adipamide) (MXD6) to PA6 which are immiscible were investigated in terms of dynamics and structure development for biaxial stretching films. For this reason, the higher order structure and stretching behaviors of the blends were studied. As a result, blends of MXD6 to PA6 which had cylindrical structures improved the properties of easy straight cut and high barrier, but did not have good stretchability and film thickness uniformity. For these reasons, they were studied to develop the biaxial stretching film of polyamide which improved stretchability and film thickness uniformity. Furthermore, blend effects of MXD6 to PA6 and dynamics analyses were investigated.

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Structural and mechanical behavior of nylon 6 films part I. Identification and stability of the crystalline phases

Cited by 144 publications

References 49 publications

Crystalline behaviors and phase transition during the manufacture of fine denier PA6 fibers

Crystalline behaviors and phase transition during the manufacture of fine denier PA6 fibers

Effect of polymer modifier chain length on thermal conductive property of polyamide 6/graphene nanocomposites

Dynamics and structure development for biaxial stretching PA6/MXD6 blend packaging films

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