Orientation of amorphous and crystalline regions in nylon 66 filaments

Chappel, F. P.

doi:10.1016/0032-3861(60)90057-4

Cited by 23 publications

(10 citation statements)

References 8 publications

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“…Basically, three melting peaks are separated from each wide melting peak. These results are similar to the investigations by Puigali et al [2] in studying the thermal properties of PA56 previously isothermally crystallized from the melt state at 233 C by DSC. They found that PA56 had three melting peaks and believed that the lowtemperature melting peak originated from the imperfect or thin crystalline structure, while the high temperature melting peak was a thicker lamella structure formed by…”

Section: Physical Structures Of Pa56 Fiberssupporting

confidence: 91%

“…For example, DTY-cir-1, stretched from POY-cir-1, significantly has a new peak at d 2 = 0.387 nm except a peak at d 1 = 0.429 nm comparing with POYcir-1. Puigali et al [2] cultivated a single crystal structure of PA56 in formic acid-ethanol (1:4) solution, and its structure showed α phase with strong diffractive peaks at 0.432 and 0.375 nm, close to the core monoclinic cell (020) and (110) crystal surfaces. It is concluded that α phase comes up obviously after stretching.…”

Section: Physical Structures Of Pa56 Fibersmentioning

confidence: 99%

“…The results of DSC characterizations of POY and DTY fibers and peak fitted analysis of peaks in Figure 6 Samples Peak fitting results DSC results Calculated by multiplying the ΔH f value of whole melting peak by the area percent of the separated peak by fitting; b Calculated according to the X c value and the area ratio of γand α-C1 in Table 2, X c,γ = X c × melting and re-crystallizing of thin crystals. [2] In order to verify whether the multiple melting behavior of PA56 fibers is related to the perfection of crystals, DTY-cir-1 has been treated isothermally for 10 min at 240 and 250 C, respectively, as shown in Figure 7. After isothermal treatment at 240 C, its melting curve shows two melting peaks at 246.4 and 253.1 C, while the original melting peak at 239.8 C disappears.…”

Section: T a B L Ementioning

confidence: 99%

“…PA6 and PA66 are two traditional aliphatic polyamides, which have been nowadays employed in a wide range of applications mainly covering the textile and automotive industries. [1][2][3][4][5][6][7][8][9][10][11][12][13] The high performance of polyamides is a consequence of the strong intermolecular interactions that can be established between the N-H and C=O groups in the macromolecules. [8] The final properties of polyamides are not logically dependent on the density of amide groups but also on the crystalline structures.…”

Section: Introductionmentioning

confidence: 99%

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The structures and properties of bio‐based polyamide 56 fibers prepared by high‐speed spinning

Wang

Kang

Guo

et al. 2020

J of Applied Polymer Sci

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Bio‐based polyamide 56 (PA56) fibers with the circular and trefoil cross‐sections were prepared by high‐speed spinning process. The pre‐oriented yarns (POY) and draw‐textured yarns (DTY) of PA56 were studied. The results showed that γ phase crystal dominated in POY with relative high degrees in the crystallinity and crystal orientation. In DTY, the drawing effect made the crystal transform from γ to α phase with the properties of the enhanced thickness of the crystal plate and the more order arranged molecules, that was the long period in these fibers was obviously increased to 7–8 nm. γ to α phase transition was much easy for PA56 fibers with circular cross‐section during drawing. PA56 fibers had excellent moisture absorption and release performances. They were easy to be dyed and had a good color fastness.

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Section: Physical Structures Of Pa56 Fiberssupporting

confidence: 91%

Section: Physical Structures Of Pa56 Fibersmentioning

confidence: 99%

Section: T a B L Ementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The structures and properties of bio‐based polyamide 56 fibers prepared by high‐speed spinning

Wang

Kang

Guo

et al. 2020

J of Applied Polymer Sci

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“…Using the free-electron model for electrons in a box of length Ln (corresponding to the length of the n double bond PE sequence) this gives fi = 0.268 (2n + 1) (39) From this, the average absorption coefficient at the maximum of the band (G)max may be obtained from64) fi = 4.39.10-9. (~)max~l.0645.H (40) where H is the band width. The anisotropy of absorption may be estimated from this since the average absorbance is…”

Section: The Calculation Of the Average Absorption Coefficientmentioning

confidence: 99%

The study of the orientation of polyvinyl chloride films by means of birefringence and infrared, visible, and ultraviolet dichroism

1968

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S U M M A R Y :The ultraviolet, visible and infrared dichroism and birefringence of a series of stretched polyvinyl chloride (PVC) samples containing polyene structures prepared by chemical dehydrohalogenation is studied. A theory is developed relating the dichroism and birefringence of a segment of a polymer molecule t o the length (and stiffness) of that segment. Values of the principal absorbances and polarizabilities of the polyene segments which are required for the theory are calculated. The theory is applied to interrclatc these optical measurements in a satisfactory manner and to provide a means of experimentally determining the orientation of PVC in an oriented film. ZUSAMMENFASSUNG:Der Dichroismus im ultravioletten, sichtbaren und infraroten Wellenbereich und die Doppelbrechung einer Reihe von verstreckten Polyvinylchloridproben, die Polyenstrukturen enthalten und durch chemische Halogenwasserstoffabspaltung dargestellt worden waren, wurden untersucht. Es wird eine Theorie iiber die Beziehungen des Dichroismus und der Doppelbrechung des Segments eines polymeren Molekiils zu der Lange (und Steifheit) dieses Segments entwickelt. Die Werte fiir die Hauptabsorptionsstellen und fiir die Polarisierbarkeit der Polyensegmente, die fiir die Theorie erforderlich sind, wurden berechnet. Die Theorie wird angewendet, um diese optischen Messungen in befriedigender Weise untereinander in Beziehung zu setzen und einen Weg zur experimentellen Bestimmung der Orientierung des Polyvinylchlorids in einem oricntierten Film zu erhalten.

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Synthetische Fasern Tendenz in Produktion, Entwicklung und Forschung

et al. 1962

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Nach einer tabellarischen Zusammeiistellung der im Handel befindlichen Synthesefasern und ihrer chemischen Konstitution wird ein uberblick iiber die Entwicklung der Synthesefaser-Produktion gegeben. Auf neue VerwendungsmCgIichkeiten wird hingewiesen. Die wichtigsten Ziele der Synthesefaserindustrie sind die Verbilligung der Rohstoflbasis (Petrochemie) und die Verbesserung der Fasereigenschaften. Einige neu entwickelte Synthesefasern werden besprochen. Schwerpunkte der Grundlagenforschung an Synthesefasern sindFeinslrukturiin tersuchungen und die Oligomerenforschung. ~ Polyrnerentyp PolyLthylen Polypropylen Pol yvin ylchlorid Polyvinylidenchlorid Pol yacrylni t ri I Polyvinylidencyanid Polyvinylalkohol Grundmolekul [ -CHz-CH>--] [ CHz CH-] I CH3

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Orientation of amorphous and crystalline regions in nylon 66 filaments

Cited by 23 publications

References 8 publications

The structures and properties of bio‐based polyamide 56 fibers prepared by high‐speed spinning

The structures and properties of bio‐based polyamide 56 fibers prepared by high‐speed spinning

The study of the orientation of polyvinyl chloride films by means of birefringence and infrared, visible, and ultraviolet dichroism

Synthetische Fasern Tendenz in Produktion, Entwicklung und Forschung

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