Mechanical Behaviour and Orientation Characterisation of Drawn Isotropic Nylon-6,6 Fibres

Babatope, Babaniyi; Isaac, D.H.

doi:10.1515/jmbm.1992.3.4.195

Cited by 2 publications

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References 3 publications

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“…Crystallinity of these samples was determined using density measurements and it was found that there is no noticeable changes in crystallinity, being about 30% in all the samples. This is not unexpected, since increasing crystallinity is not generally observed when drawing polymers below T g , due to insufficient molecular mobility [23][24][25]. Molecular orientation can be measured directly or indirectly using various physical techniques.…”

Section: Microstructure Changes During Drawingmentioning

confidence: 99%

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Structure characterization of heat set and drawn polyamide 66 fibers by FTIR spectroscopy

Vasanthan

Salem

2001

Materials Research Innovations

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Structural changes that occur during thermally induced and strain induced crystallization of polyamide 66 fibers were studied by infrared spectroscopy, density measurement and optical microscopy. Two bands at 924 and 1136 cm -1 were shown to arise from the amorphous phase and assignment of the bands at 936 and 1200 cm -1 to the crystalline phase were confirmed. We demonstrated that two different infrared spectroscopic methods could be used to determine the total crystallinity of polyamide 66 fibers. One is a calibration method in which the band ratio of 1200 and 1630 cm -1 is plotted against the crystallinity measured by density measurements. The other one is an independent infrared method. Crystallinity obtained by the independent infrared spectroscopic method showed good agreement with crystallinity observed by density measurement. Infrared dichroism was used to obtain the crystalline orientation using the band at 936 cm -1 . The transition moment angle of 48°was found for the band at 936 cm -1 with respect to chain axis. Amorphous orientation was obtained using Stein's equation.

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Section: Microstructure Changes During Drawingmentioning

confidence: 99%

“…11. The rapid development of crystalline orientation 〈P 2 (cosθ)〉 c to almost full fiber-axis orientation compared with the slower development of orientation in the noncrystalline regions 〈P 2 (cosθ)〉 a is common behavior for flexible-chain polymers [22,23,25,29,31]. …”

Section: Microstructure Changes During Drawingmentioning

confidence: 99%

Structure characterization of heat set and drawn polyamide 66 fibers by FTIR spectroscopy

Vasanthan

Salem

2001

Materials Research Innovations

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Structure development of polyamide‐66 fibers during drawing and their microstructure characterization

Vasanthan

Ruetsch

Salem

2002

J Polym Sci B Polym Phys

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Structure development during drawing was studied for three sets of polyamide‐66 (PA66) fibers with density, optical microscopy, wide‐angle X‐ray diffraction, and Fourier transform infrared spectroscopy. The crystallinity, estimated by density measurements, remained virtually constant with increasing draw ratios, indicating that stress‐induced crystallization did not occur for the PA66 fibers drawn at room temperature, but there was a rapid transformation from a hedrite morphology to a fibrillar one. The absence of stress‐induced crystallization differed from the behavior of polyamide‐6, and this was attributed to the stronger hydrogen bonding between polyamide chains and the higher glass‐transition temperature of PA66. Polarized infrared spectroscopy was used to measure the transition‐moment angles of the vibrations at 936 and 906 cm−1, which were found to be 48 and 60°, respectively. The crystalline orientation was estimated from the band at 936 cm−1, and the increase with an increasing draw ratio was in close quantitative agreement with X‐ray diffraction data; this showed that infrared spectroscopy could be used reliably to measure the crystalline orientation of PA66 fibers. Because we were unable to obtain the transition‐moment angle of the amorphous bands, the amorphous orientation was obtained with Stein's equation. The amorphous orientation developed more slowly than the crystalline orientation, which is typical behavior for flexible‐chain polymers. © 2002 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 40: 1940–1948, 2002

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Mechanical Behaviour and Orientation Characterisation of Drawn Isotropic Nylon-6,6 Fibres

Cited by 2 publications

References 3 publications

Structure characterization of heat set and drawn polyamide 66 fibers by FTIR spectroscopy

Structure characterization of heat set and drawn polyamide 66 fibers by FTIR spectroscopy

Structure development of polyamide‐66 fibers during drawing and their microstructure characterization

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