Crystallization and crosslinking of polyamide‐1010 under elevated pressure

Yang, Jun; Dong, Wen‐Fei; Luan, Yucheng; Liu, Jingjiang; Li, Shue; Guo, Xiaolu; Zhao, Xudong; Su, Wenhui

doi:10.1002/app.10193

Cited by 18 publications

(15 citation statements)

References 13 publications

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“…[3][4][5] Due to good mechanical properties and semicrystalline structure, the investigation of dielectric and electrical behaviors of nylon 1010 is important both from the fundamental and technological points of view. 1,2 Moreover, like other nylons, nylon 1010 is a typical semicrystalline polymer.…”

Section: Introductionmentioning

confidence: 99%

Influence of the relaxation of Maxwell-Wagner-Sillars polarization and dc conductivity on the dielectric behaviors of nylon 1010

Zhang

2006

Journal of Applied Physics

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Current instabilities in rare-earth oxides-HfO 2 gate stacks grown on germanium based metal-oxidesemiconductor devices due to Maxwell-Wagner instabilities and dielectrics relaxationThe effects of dc conductivity and Maxwell-Wagner-Sillars ͑MWS͒ polarization on the dielectric behaviors of nylon 1010 have been investigated by means of dielectric relaxation spectroscopy. The experimental dielectric data were analyzed within the formalisms of dielectric permittivity, complex electric modulus, and complex impedance. The results were discussed in terms of dc conductivity, MWS polarization, electrode polarization, and conductivity relaxation. The results revealed that the charge carrier transport is governed by the motion of the polymer chains. There was a transition temperature located between 100 and 110°C in the conductivity relaxation process, showing two different mechanisms for charge carrier movement. The change of charge carrier movement mechanisms was due to the motion of the polymeric chains in the interphase between amorphous and crystalline regions taking place at this temperature.

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Section: Introductionmentioning

confidence: 99%

Influence of the relaxation of Maxwell-Wagner-Sillars polarization and dc conductivity on the dielectric behaviors of nylon 1010

Zhang

2006

Journal of Applied Physics

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“…by cross-linking as reported by Yang et al [36,37] for nylon-1010 after treatment at 523 K in the 1.0 to 1.2 GPa range. Since the line width of an NMR resonance reflects dynamical processes, such as the exchange and reorientation speed of molecular movements, it can be used to detect cross-linking in polymers [38,39].…”

Section: Polymorphism and Cross-linking Properties By Solid State Nmrmentioning

confidence: 99%

Microstructure, nucleation and thermal properties of high-pressure crystallized MWCNT/nylon-6 composites

Gröbner

Tonpheng

et al. 2011

Polymer

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This is an accepted version of a paper published in Polymer. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the published paper: Yu, J., Gröbner, G., Tonpheng, B., "Microstructure, nucleation and thermal properties of high-pressure crystallized MWCNT/nylon-6 composites" Polymer, 52 (24) ABSTRACTMulti-wall carbon nanotube (MWCNT)/nylon-6 composites made by in-situ polymerization and subsequently modified by treatment at 1.0 GPa (or 1.7 GPa) and 530 K have been studied by WAXD, DSC and NMR. The pressure treatment gives an amorphous to crystalline transformation where the crystallinity increases from ~31% to as much as ~58% concurrently as the nylon-6 crystals increase in size and attain a preferred orientation relative to the applied pressure. A composite of 2.1 wt% purified MWCNT in nylon-6 shows significantly higher melting temperature than neat nylon-6 after identical pressure treatments. The improved thermal stability of the composite is attributed to crystal growth in the presence of reinforcing MWCNTs.The NMR spectrum of a pressure treated composite is similar to that of nylon-6 single crystals, which suggests a reduction of crystal boundaries after treatment, but there is no indication of covalent bonds between the nylon-6 chains and the MWCNTs.

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“…In general, folded‐chain crystals are tough and ductile and tend to produce low modulus and high elongation, whereas extended‐chain crystals are brittle and tend to have higher modulus. After Wunderlich and Arakawa2 reported that polyethylene extended‐chain crystals with a thickness of up to 3 µm could be formed under high pressure, many researchers performed investigations on the high pressure crystallization behaviors of some polymers and obtained their extended‐chain crystals 3–14. In the 1970s, Gogolewski and Pennings5, 6 and Stamhuis and Pennings7 extensively investigated the structure and thermal properties of polyamide 6, polyamide 11 and polyamide 12 crystallized or annealed under high pressure and obtained the corresponding extended‐chain crystals.…”

Section: Introductionmentioning

confidence: 99%

“…However, the thickness of the crystals was small and the growth time was long, implying that the kinetic problem resulting from the long‐chain nature of polymeric macromolecules had not been solved. Yang et al 8, 9 recently investigated the crystallization and crosslinking behaviors of polyamide 1010 with longer aliphatic segments annealed in the pressure range from 0.7 to 2.5 GPa. The results showed that the highest melting temperature and heat of fusion were 208 °C and 132.0 J g −1 respectively for a sample annealed at 1.5 GPa.…”

Section: Introductionmentioning

confidence: 99%

Crystallization and morphology of polyamide 1010/single‐walled carbon nanotube nanocomposites under elevated pressure

Wang

Wan

Zeng

et al. 2012

Polymer International

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Polyamide 1010/single-walled carbon nanotube (PA1010/SWNT) nanocomposites prepared by melt compounding were treated under a pressure of 2.0 GPa and at three different temperatures (250, 300 and 350 • C) for 30 min. Then, all the samples were naturally cooled to room temperature from the melt prior to release of the applied pressure. The melting temperature and crystallinity of high pressure crystallized samples were shifted to a high value after the treatment temperatures under pressure. The infrared spectrum of the high pressure crystallized samples showed a considerable improvement of crystalline order, a closer packing of the polymer chains due to the shorter N-C bond length, and the presence of a large proportion of free N-H groups resulting from antiparallel chains in flat zigzag conformation. Wide-angle X-ray diffraction measurements indicated that the high pressure gave rise to an increase in crystallite dimensions as well as to a decrease of the distance between the crystal planes bonded by the hydrogen bond (100) planes and by the van der Waals force (010) planes. Scanning electron microscope images showed that denser texture, thicker covering layers on the tubes and regular cubic sugar-like crystals with a lateral length of about 1.5 µm could be detected on the fracture surface of PA1010/SWNT nanocomposites crystallized under pressure.

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Crystallization and crosslinking of polyamide‐1010 under elevated pressure

Cited by 18 publications

References 13 publications

Influence of the relaxation of Maxwell-Wagner-Sillars polarization and dc conductivity on the dielectric behaviors of nylon 1010

Influence of the relaxation of Maxwell-Wagner-Sillars polarization and dc conductivity on the dielectric behaviors of nylon 1010

Microstructure, nucleation and thermal properties of high-pressure crystallized MWCNT/nylon-6 composites

Crystallization and morphology of polyamide 1010/single‐walled carbon nanotube nanocomposites under elevated pressure

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