Studies on the crystallization and melting of nylon 66: 3. Melting behaviour of negative spherulites by calorimetry

Ramesh, C.; Keller, A.; Eltink, S.J.E.A.

doi:10.1016/0032-3861(94)90483-9

Cited by 29 publications

(19 citation statements)

References 5 publications

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“…Figure 4 depicts the DSC curves of the polyamides. The obtained polyamides exhibit double-melting endotherms, which is a common phenomenon observed in semicrystalline polymers [24][25][26]. Additionally, the melting temperatures (T m ) of the polyamides decrease with increasing the amount of methylene of polymeric backbone.…”

Section: Water Absorption Of the Obtained Polyamidesmentioning

confidence: 90%

Environment-friendly synthesis of long chain semiaromatic polyamides

Wang¹,

Zhang

2009

Express Polym. Lett.

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Long chain semiaromatic polyamides were synthesized by the reactions of p-phenylenediacetic acid with long chain aliphatic diamines, and characterized by Fourier transform infrared spectroscopy (FTIR) and by proton nuclear magnetic resonance (1H NMR). The thermal behaviors were determined by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The solubility, dynamic mechanical, physical and mechanical properties of the polyamides were also investigated. The resultant polyamides have intrinsic viscosity ranging from 1.8 to 2.1 dl•g–1, their melting temperatures range from 254 to 290°C, and their glass transition temperatures obtained from dynamic mechanical analysis are in the range 87–113°C. The physical and mechanical properties of long chain semiaromatic polyamides were compared with those the PA9T. The results show that the heat resistance and the mechanical properties of poly(decamethylene-pphenylenediacetamide) (PA10P) are near to those of PA9T, so PA10P is a promising heat resistant engineering plastic

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Section: Water Absorption Of the Obtained Polyamidesmentioning

confidence: 90%

Environment-friendly synthesis of long chain semiaromatic polyamides

Wang¹,

Zhang

2009

Express Polym. Lett.

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“…The heating rate is 10°C·min -1 , and the test temperature is 50 to 330°C. PA10N exhibits double-melting endotherms, which is a common phenomenon observed in semicrystalline polymers [27][28][29]. The melting temperature (T m ) of PA10N is 320°C based on curve A, and the crystallization PA10N.…”

Section: Characterization Of Pa10nmentioning

confidence: 99%

Synthesis, characterization and thermal decomposition of poly(decamethylene 2,6-naphthalamide)

Yang¹,

Fu²,

Liu³

et al. 2010

Express Polym. Lett.

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Abstract.A novel engineering plastic, poly(decamethylene 2,6-naphthalamide) (PA10N) was prepared via a reaction of 2,6-naphthalene dicarboxylic acid and 1,10-decanediamine. The structure of synthesized PA10N was characterized by elemental analysis, Fourier transform infrared (FT-IR) spectroscopy and proton nuclear magnetic resonance ( 1 H-NMR). The thermal behavior was determined by differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA) and dynamic mechanical analysis (DMA). Melting temperature (Tm), glass transition temperature (Tg) and decomposition temperature (Td) of PA10N are 320, 144 and 495°C, respectively. The solubility, water-absorbing capacity, and mechanical properties of PA10N have also been investigated. Pyrolysis products and thermal decomposition mechanism of PA10N were analyzed by flash pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The results show that the heat resistance and mechanical properties of PA10N are near to those of poly(nonamethylene terephthalamide) (PA9T), and PA10N is a promising heat-resistant and processable engineering plastic.

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“…The study in the melting process of the crystalline or semicrystalline polymers, especially of the semicrystalline polymers (e.g., nylons), have been attractive for many scientists in the past half century accompanied with a large number of articles published. [7][8][9][10][11][12] However, the multiple melting behavior is still not be fully understood and there is no general consensus on its origin. The interpretation varies from different crystal structures 13 or lamellar thickness 14 to simultaneous melting and recrystallization.…”

Section: Introductionmentioning

confidence: 99%

Study on the thermal behaviors and the morphology in PVP and nylon 6 blends

Hao

Zhao

Wang

et al. 2011

J of Applied Polymer Sci

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In this report, polyamides were solution blended in the formic acid with poly(vinyl pyrrolidone)(PVP), an amorphous polar polyamide. The thermal behaviors and morphological change in the blends of Nylon 6 (PA6) and PVP were investigated in details via WAXD, DSC, FT-IR and POM methods. The equilibrium melting temperatures for PA6 in the blends were estimated based on the linear and nonlinear Hoffman-Weeks (LHW and NLHW) extrapolative methods. With increasing the mass ratio of PVP to PA6, T m (melting temperature) and T c (crystallization temperature) of PA6 in blends both decreased as well as that of the spherulite size of PA6. The interaction mode between PVP and PA6 was investigated by FT-IR spectroscopy, and the spectral changes indicated that the carbonyl groups of PVP had formed hydrogen bonding with the NAH groups of PA6 molecules in the molten state, which resulted in the variation of the morphology and thermal behaviors.

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Studies on the crystallization and melting of nylon 66: 3. Melting behaviour of negative spherulites by calorimetry

Cited by 29 publications

References 5 publications

Environment-friendly synthesis of long chain semiaromatic polyamides

Environment-friendly synthesis of long chain semiaromatic polyamides

Synthesis, characterization and thermal decomposition of poly(decamethylene 2,6-naphthalamide)

Study on the thermal behaviors and the morphology in PVP and nylon 6 blends

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