Characterization of crystalline structure and free volume of polyamide 6/nitrile rubber elastomer thermoplastic vulcanizates: Effect of the processing additives

Gomes, Ana Catarina de Oliveira; Soares, Bluma G.; Oliveira, Márcia G.; Machado, Juliana Costa; Windmöller, Dario; Paranhos, Caio Márcio

doi:10.1002/app.45576

Cited by 12 publications

(4 citation statements)

References 38 publications

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“…After dyeing of PA6 fibers, the crystallization temperature and melting temperature both shift toward higher values, which may be attributed to the reaction between dye molecules and PA6, which reduced the flexibility of PA6 molecular chain, and required higher temperature to make the molecular chain move and crystallize. 36 Figure 6 shows the 2D-WAXD patterns of selected samples, which feature evident diffraction rings. By processing the 2D-WAXD patterns with appropriate software, the exact crystallinity could not be effectively obtained from the 2D diffractogram alone, so the integrated 1D curve was fitted with the pseudo-Voigt function for peak splitting using Jade software.…”

Section: Crystallization and Orientation Performance Analysismentioning

confidence: 99%

Oligomer composition and content in regenerated PA6 fiber and its effect on properties

Wang,

Guo,

Zhong

et al. 2024

J of Applied Polymer Sci

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The preparation process from waste fibers to regenerated fibers is an environmental significance work. In this work, liquid chromatography/time‐of‐flight mass spectrometry, advanced polymer chromatography/multi‐angle laser‐light‐scattering/refractive index detector, and two‐dimensional wide‐angle X‐ray diffractometry were employed to characterize the polycaprolactam(PA6) fibers above oligomers composition and content, molecular weight and distribution, crystallization and orientation, and analyzing the changes in mechanical properties. The total content of oligomers in physical and chemical regenerated PA6 fiber is 2.084 wt% and 1.812 wt%, individually, which is higher than that in waste PA6 fiber. And the oligomer content of C1–C4 (cyclic monomer, cyclic dimer, cyclic trimer, and cyclic tetramer) in the regenerated PA6 fiber is higher than that of waste PA6 fiber. The regenerated PA6 fiber sample contains more low‐molecular‐weight substances, making it easier to form crystal nuclei and crystallize. During the dyeing process of the regenerated PA6 fiber, the γ crystal transformed into α crystal. The tensile strength of physical and chemical regenerated PA6 fiber is lower than that of waste PA6 fiber. And after dyeing, the oligomers content of regenerated PA6 fiber is significantly decreased, especially in C1–C4 oligomer. However, the crystalliniy and orientation of regenerated PA6 fibers were improved, which also leads to the fracture strength increased by about 20% compared to undyed fibers.

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Section: Crystallization and Orientation Performance Analysismentioning

confidence: 99%

Oligomer composition and content in regenerated PA6 fiber and its effect on properties

Wang,

Guo,

Zhong

et al. 2024

J of Applied Polymer Sci

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“…Consequently, the intermolecular forces of the polymer chains and the number of free valences in the three-dimensional structure are reduced. The internal space between the polymer chains is thus larger, and the free volume that allows the polymer chains to flow above their glass transition temperature increases [ 11 , 12 , 13 , 14 , 15 ]. This new conformation of the polymer chains, in turn, increases their mobility and enhances the filler distribution in the rubber mixture [ 16 , 17 , 18 , 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Polarity of the Plasticizer on the Mechanical Stability of the Filler Network by Simultaneous Mechanical and Dielectric Analysis

Aloui¹,

Deckmann²,

Trimbach³

et al. 2022

Polymers

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Four styrene butadiene rubber (SBR) compounds were prepared to investigate the influence of the plasticizer polarity on the mechanical stability of the filler network using simultaneous mechanical and dielectric analysis. One compound was prepared without plasticizer and serves as a reference. The other three compounds were expanded with different plasticizers that have different polarities. Compared with an SBR sample without plasticizer, the conductivity of mechanically unloaded oil-extended SBR samples decreases by an order of magnitude. The polarity of the plasticizer shows hardly any influence because the plasticizers only affect the distribution of the filler clusters. Under static load, the dielectric properties seem to be oil-dependent. However, this behavior also results from the new distribution of the filler clusters caused by the mechanical damage and supported by the polarity grade of the plasticizer used. The Cole–Cole equation affirms these observations. The Cole–Cole relaxation time τ and thus, the position of maximal dielectric loss increases as the polarity of the plasticizer used is also increased. This, in turn, decreases the broadness parameter α implying a broader response function.

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“…The clay presented better dispersion and peeling effect in matrix, and the composites had better mechanical properties. Gomes et al . studied the effect of processing aid Ethylene Vinyl Acetate Copolymer (EVA) on the aggregation structure of PA6/NBR thermoplastic elastomers.…”

Section: Introductionmentioning

confidence: 99%

The formation of fibrous structure of polyamide 6 induced by the three‐step forming process and its prominent reinforcement in nitrile rubber

Cai

Jia

Wang

2019

J of Applied Polymer Sci

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Nitrile rubber (NBR) blends with excellent performance have always been a hot research topic in petroleum field. Due to the excellent performance and compatibility of polyamide 6 (PA6), it provides an opportunity for the preparation of high‐performance NBR/PA6 blends. In this article, NBR/PA6 blends were prepared by the three‐step molding process. Experimentally, it was found that PA6 has a prominent reinforcement effect in NBR matrix. The variation of this mechanical property was investigated from different aspects of the crystal structure, crystallinities, phase morphology, and so on. It can be cleared that the formation of fibrous structure of PA6 phase is the main factor for reinforcement of the polymer blends. Meanwhile, the formation mechanism of the special phase structure induced by the three‐step process is deeply expounded and its structural evolution schematic is established. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47472.

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Characterization of crystalline structure and free volume of polyamide 6/nitrile rubber elastomer thermoplastic vulcanizates: Effect of the processing additives

Cited by 12 publications

References 38 publications

Oligomer composition and content in regenerated PA6 fiber and its effect on properties

Oligomer composition and content in regenerated PA6 fiber and its effect on properties

Influence of the Polarity of the Plasticizer on the Mechanical Stability of the Filler Network by Simultaneous Mechanical and Dielectric Analysis

The formation of fibrous structure of polyamide 6 induced by the three‐step forming process and its prominent reinforcement in nitrile rubber

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