Transient microstructure in long alkane segment polyamide: Deformation mechanism and its temperature dependence

Wang, Lili; Dong, Xia; Huang, Ming-Qiu; Wang, Dujin

doi:10.1016/j.polymer.2016.05.038

Cited by 50 publications

(58 citation statements)

References 40 publications

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“…Besides, with the increasing of 1012 content, some new diffraction peaks are observed, especially when the content of 1012 units is more than 20%. Two obvious peaks at 2θ = 17.5° ((100) reflection) and 18.8° [(010)/(110) reflection] are attributed to the α‐crystalline form of 1012 segments, which is in agree with the literature . It is concluded that the 1012 segments could form crystals themselves if the content of 1012 is high enough, which could also be revealed by the latter DSC results.…”

Section: Resultssupporting

confidence: 88%

“…In general, increasing the density of amide bonds will make the intermolecular hydrogen‐bond interaction and molecular polarity stronger, which results in higher water absorption and more perfect crystallization. Additionally, longer alkyl chain will improve the flexibility of molecular chain and enhance the plasticity of materials . These imply that copolymerization could be an efficient way of polyamide modification.…”

Section: Introductionmentioning

confidence: 99%

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Poly(decamethylene terephthalamide) copolymerized with long‐chain alkyl dodecanedioic acid: Toward bio‐based polymer and improved performances

Zou

Wang

Feng

et al. 2018

J of Applied Polymer Sci

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Poly(decamethylene terephthalamide) (PA10T), a bio‐based high‐performance semi‐aromatic polyamide, has been commercialized in recent years. However, there still are some weaknesses restricting its application range, such as narrow melt processing window and low ductility. In this study, we chose dodecanedioic acid (a potential bio‐based raw material) as the comonomer to prepare copolyamides [poly(decamethylene terephthalamide/decamethylene dodecanediamide), PA10T/1012] for solving these problems. The basic properties of these copolyamides were characterized by viscosity measurement, Fourier transform infrared spectrometer, proton nuclear magnetic resonance, wide‐angle X‐ray diffraction, differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical analysis, and tensile measurement. Results show that, compared to PA10T, PA10T/1012 exhibits wider melt processing window and more outstanding elongation at break. Meanwhile, PA10T/1012 is still qualified for high temperature resistant material. Furthermore, Tg, Td,5%, Td,10%, and Td,max of PA10T/1012 show a linear dependence on 1012 content, which is helpful to design new bio‐based copolyamides for meeting the needs of various occasions. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46531.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Poly(decamethylene terephthalamide) copolymerized with long‐chain alkyl dodecanedioic acid: Toward bio‐based polymer and improved performances

Zou

Wang

Feng

et al. 2018

J of Applied Polymer Sci

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“…The γ – α″ form shuttling in crystalline PA12 domains is probably the major microscopic evolution of 40D in terms of crystal forms. Amorphous polyamide can be transformed into crystalline polyamide during stretching under high temperature, but the transition would not occur under room temperature due to the lack of thermal acitiviation …”

Section: Resultsmentioning

confidence: 99%

“…Polarized Fourier transform infrared spectroscopy (FTIR) can provide quantitative structural information about the macromolecular chain orientation in both crystalline and amorphous domains based on the infrared dichroism of specific bands. [25][26][27] WAXD can render information on the chain conformation and aggregation state of chains in the crystalline and amorphous regions. 19,28 Small-angle X-ray scattering (SAXS) can probe the aggregation structure of crystalline lamellae.…”

mentioning

confidence: 99%

Microstructural evolution underlying the ternary stages of the elastic behaviors for poly(ether‐b‐amide) copolymer elastomers

Zhu

Dong

Huang

et al. 2018

J Polym Sci B Polym Phys

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Three stages of elastic behavior were observed during cyclic deformations for poly(ether‐b‐amide) (PEBA) segmented copolymers based on crystalline hard segments of polyamide 12 (PA12) and amorphous soft segments of poly(tetramethylene oxide) (PTMO). The underlying microstructural evolution was characterized by a combination of in situ Fourier transform infrared spectroscopy (FTIR), wide‐angle X‐ray diffraction (WAXD), and small‐angle X‐ray scattering (SAXS) technologies. The γ–α″ phase transition of crystalline PA12 occurred upon stretching, and the orientation of the α″ phase was less reversible under larger strains. PTMO chain orientation cannot be restored to the initial state, contributing to plastic deformation. Driven by the entropy effect, the strain‐induced crystallization of PTMO can fuse during sample retarding, exerting little influence on the residual strain. For PEBA with a shore D hardness of 35 D, the long period (L) can be restored to the initial L after the sample was unloaded until system fibrillation. The tie molecules between adjacent oriented lamellae can be by drawn out high stress in a PEBA material with a shore D hardness of 40 D, and the relaxation led to a second long period. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 855–864

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“…As shown in Figure (a), the NH stretching vibrations of polyamide composites exhibit two infrared bands at 3484 (weak shoulder) and 3293 cm −1 , which are assigned to “free” and hydrogen‐bonded NH stretching modes, respectively . NH Fermi resonance appears at 3075 cm −1 .…”

Section: Resultsmentioning

confidence: 97%

High efficiency toughness of aromatic sulfonamide in polyamide 6

Jia

Cai

Chen

et al. 2018

J of Applied Polymer Sci

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In order to overcome the brittle fracture characteristics of polyamides, the study on high efficiency toughening of polyamides is always a hot topic. In this article, n‐ethyl‐p‐toluene sulfonamide (N‐PTSA) was used as the toughening agent in polyamide 6 (PA6) matrix. The PA6/N‐PTSA composites were prepared by melt compounding method. The PA6 composites were analyzed systematically from aspects of mechanical properties, thermal properties, crystal structures, and hydrogen bonds. There existed an obvious toughening effect in PA6 composite with the addition of 7 wt % of N‐PTSA. Meanwhile, the tensile strength of the composite was not reduced. The addition of N‐PTSA induced the formation of α‐form crystals, higher crystallinities and lower density of hydrogen bonds in the composites, which was beneficial to improvement of the mechanical properties. Based on the above results, the molecular structure model of toughening mechanism of N‐PTSA in PA6 was established. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46527.

show abstract

Transient microstructure in long alkane segment polyamide: Deformation mechanism and its temperature dependence

Cited by 50 publications

References 40 publications

Poly(decamethylene terephthalamide) copolymerized with long‐chain alkyl dodecanedioic acid: Toward bio‐based polymer and improved performances

Poly(decamethylene terephthalamide) copolymerized with long‐chain alkyl dodecanedioic acid: Toward bio‐based polymer and improved performances

Microstructural evolution underlying the ternary stages of the elastic behaviors for poly(ether‐b‐amide) copolymer elastomers

High efficiency toughness of aromatic sulfonamide in polyamide 6

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