Lamellar orientation of polyamide 6 thin film crystallization on solid substrates

Zhong, Lu-Wei; Ren, Xiang‐Kui; Yang, Shuang; Chen, Er-Qiang; Sun, Chunxia; Stroeks, Alexander; Yang, Tieying

doi:10.1016/j.polymer.2014.06.031

Cited by 31 publications

(17 citation statements)

References 47 publications

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“…On the other hand, if film thickness becomes sufficiently large, it has been reported that some polymers tend to produce edge‐on lamellar orientation . The profile of the lamellae of copolymer 7 generated on 32.5 nm thick film (G2) does not show a constant height but many irregular protruded ridges suggesting it is stacks of edge‐on lamellae.…”

Section: Resultssupporting

confidence: 91%

“…Based on selected area electron diffraction analysis, it has been reported that some polymers such as isotactic poly( 1 ‐butene), isotactic polystyrene, and polyamide 6 produce flat‐on single crystals when the film thickness is very small. In this study, it was observed that there is a particular film thickness range less than around 10 to 15 nm, in which surface crystals exhibit broad lamellae in the plane consistent with flat‐on lamellar morphology.…”

Section: Resultsmentioning

confidence: 99%

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Crystalline morphologies at the surface of PET/PEN random copolymer films

Shinotsuka

Assender

2019

Polymer Crystallization

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Crystalline Morphologies of the Surface of Random Copolymer Films In their work reported in article e10087, Shinotsuka and Assender demonstrate that polymers can crystallize preferentially at the free surface when annealed at temperatures between the surface and bulk glass transition temperatures, forming dendritic structures observable by AFM. This is a near‐surface rather than a thin‐film phenomenon. A 436nm thick 50/50 PET/PEN random copolymer shows surface crystallization at a temperature 90°C lower than bulk crystallization. In 31nm films, the crystallization is affected by the confinement of the thin film and the first stages of crystallization, near the nucleus, form with one morphology (orientation) and then switch to clearer dendrites, likely of edge‐on orientation. (DOI: https://doi.org/10.1002/pcr2.10087)

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Crystalline morphologies at the surface of PET/PEN random copolymer films

Shinotsuka

Assender

2019

Polymer Crystallization

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“…The thickness of polymer thin film is a key factor determining its crystalline morphology [37]. On the basis of experimental observations in thin and ultrathin polymer films, the size effects related to film thickness have been widely investigated in the literature [37,[48][49][50][51][52][53][54][55][56][57][58]. When the film thickness is much larger than 100 nm, regular spherulites similar to those observed in bulk crystallization are generally formed.…”

Section: Introductionmentioning

confidence: 99%

Crystalline and Spherulitic Morphology of Polymers Crystallized in Confined Systems

Xie

Bao

et al. 2017

Crystals

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Due to the effects of microphase separation and physical dimensions, confinement widely exists in the multi-component polymer systems (e.g., polymer blends, copolymers) and the polymers having nanoscale dimensions, such as thin films and nanofibers. Semicrystalline polymers usually show different crystallization kinetics, crystalline structure and morphology from the bulk when they are confined in the nanoscale environments; this may dramatically influence the physical performances of the resulting materials. Therefore, investigations on the crystalline and spherulitic morphology of semicrystalline polymers in confined systems are essential from both scientific and technological viewpoints; significant progresses have been achieved in this field in recent years. In this article, we will review the recent research progresses on the crystalline and spherulitic morphology of polymers crystallized in the nanoscale confined environments. According to the types of confined systems, crystalline, spherulitic morphology and morphological evolution of semicrystalline polymers in the ultrathin films, miscible polymer blends and block copolymers will be summarized and reviewed.

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“…The crystallization of the PA1012‐rich phase leads to spherulites that are formed from a weakly segregated melt, whose microphase separated morphology is obliterated by crystallization via “breaking‐out.” Considering that the lateral dimensions are far bigger than the thickness, these spherulites are rather flat resembling disks. Sheaf‐like patterns of PA1012 lamellae grow from the central nucleus and eventually formed the “eyes structure” symmetrically on its two sides, which suggest an edge‐on orientation of lamellae …”

Section: Resultsmentioning

confidence: 99%

Influence of soft block crystallization on microstructural variation of double crystalline poly(ether‐ mb ‐amide) multiblock copolymers

Cao

Zhu

Wang

et al. 2018

Polymer Crystallization

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This work reports the crystallization behavior of a series of poly(ether‐mb‐amide) multiblock copolymer (PEAc) samples, composed of long‐chain carbon polyamide 1012 (PA1012) as hard segments and poly(tetramethylene oxide) (PTMO) as soft segments. Rheological and dynamic mechanical results showed that PA1012‐mb‐PTMO multiblock copolymers are microphase segregated in the both melt and solid states, forming two partially miscible phases with distinct crystallization and glass‐transition temperatures that depend on composition. The copolymers are probably in the weak segregation limit, as the PA1012‐rich phase can break out and form spherulitic templates during cooling from the melt. For the PA1012‐mb‐PTMO copolymers with long PTMO segments, it was found that the crystallization of the PTMO‐rich phase induced a variation in the long period as temperature decreased. This effect was related to the content of PTMO segments. At room temperature, only the PA1012‐rich phase crystallized, whereas PTM‐ rich phase remained amorphous within the interlamellar regions of the PA1012 spherulitic templates. Upon further cooling, the PTMO‐rich phase crystallized forming crystalline lamellae located in between the adjacent PA1012 lamellae, forming double crystalline spherulites. Based on the research results, a schematic model was proposed to describe the multistage crystallization behavior of PA1012‐mb‐PTMO copolymers.

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Lamellar orientation of polyamide 6 thin film crystallization on solid substrates

Cited by 31 publications

References 47 publications

Crystalline morphologies at the surface of PET/PEN random copolymer films

Crystalline morphologies at the surface of PET/PEN random copolymer films

Crystalline and Spherulitic Morphology of Polymers Crystallized in Confined Systems

Influence of soft block crystallization on microstructural variation of double crystalline poly(ether‐ mb ‐amide) multiblock copolymers

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