Effect of spherulites on the mechanical properties of nylon 66

Starkweather, Howard W.; Brooks, Robert C.

doi:10.1002/app.1959.070010214

Cited by 119 publications

(31 citation statements)

References 6 publications

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“…The diameter of spherulites is the only structural feature that differentiates these films from all other films (1-5 µm against 15-20 µm). In accordance with the numerous experimental data (e.g., [24][25][26][27]), the small spherulitic structure of the samples presupposes higher parameters of flowability and ultimate stress than the large spherulitic structure. The spherulitic shape however is the most widely spread shape of supramolecular structures of unoriented semicrystal line polymers crystallized from melt or a weakly dilute solution [28], albeit far from the only shape.…”

Section: Spherulites and Mechanics Of Compositessupporting

confidence: 65%

Effect of fullerene C60 on the structure and mechanical properties of thin films based on poly(methylmethacrylate) and other carbochain vinyl polymers: A technological aspect

et al. 2012

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The effect of fullerene C 60 on the structure and mechanical properties of poly(methyl methacry late) films are studied via the methods of X ray diffraction, mechanics, and optical and atomic force micros copy. The findings of this study are verified with the use of the data obtained for amorphous and semicrystal line samples of other polymers, primarily carbochain polymers of the vinyl series, such as polyethylene, polypropylene, and polystyrene.

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Section: Spherulites and Mechanics Of Compositessupporting

confidence: 65%

Effect of fullerene C60 on the structure and mechanical properties of thin films based on poly(methylmethacrylate) and other carbochain vinyl polymers: A technological aspect

et al. 2012

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“…The mobility of the molecule chains in the amorphous region plays a dominant role in the strength and modulus. This is also the reason for the drop in strength and modulus after the polyamide absorbs water41 or when the tests are performed at elevated temperatures 42…”

Section: Resultsmentioning

confidence: 99%

Structure, Morphology and Properties of a Novel Molecular Composite by In‐Situ Blending of Anionic Polyamide 6 with a Polyamide Copolymer Containing Rigid Segments

Wang

Yang

Zheng

2007

Macro Materials & Eng

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Molten caprolactam, in which a polyamide copolymer (HPN) containing rigid segments was dissolved, was polymerized by means of anionic ROP to in produce polyamide (PA, nylon) 6 blends with HPN in situ. A novel molecular composite was achieved in which toughness and strength were simultaneously improved, as well as modulus, compared to virgin PA6. In view of the interchange reaction between PA6 and PA1212 (and PA66) in blends fabricated in the same way, it was deduced that a similar reaction between PA6 and HPN took place during the blending and led to copolymerization between the two components. The formation of copolymers was verified by their single glass transition and single melting peak, measured through DMA and DSC, respectively. DSC analysis also showed that the occurrence of the interchange reaction inhibited the crystallization and suppressed the melting point of PA6. Analysis by FT-IR spectroscopy indicated that the difference in the distance between the amide groups for PA6 and HPN induced a decrease in the amount and strength of hydrogen bonding. Moreover, characterization by POM and XRD revealed that the spherulite size of the PA6 crystals decreased dramatically and the amount of g crystal increased slightly with the majority of crystallites being a crystals. Furthermore, it was found through the observation of the morphology by SEM that no phase separation existed in the composites. On the basis of detailed analysis and a comparison between the in situ PA6/PA66 and PA6/ HPN blends, it is believed that the combination of markedly decreasing spherulite size and similar segmental mobility resulted in the simultaneous improvement of mechanical properties for the in situ PA6/HPN blends.

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“…Nylon in particular was selected as it represents a synthetic analogue to natural silks, being essentially a semicrystalline polyamide, albeit with much coarser order-disorder domains, of micrometre scale (Starkweather and Brooks, 1959;Hammer et al, 1959). These filaments show precise consistency in their diameter, allowing for comparison of the variability due to specimen variation to that arising due to measurement.…”

Section: Methodsmentioning

confidence: 99%