Nucleation details of nanohybrid shish-kebabs in polymer solutions studied by molecular simulations

Nie, Yijing; Zhang, Rongjian; Zheng, Kaishan; Zhou, Zhiping

doi:10.1016/j.polymer.2015.08.057

Cited by 48 publications

(58 citation statements)

References 39 publications

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“…Some studies of molecular dynamics simulation presented that the PE chains preferred to extend or orient along the tube axis in the first coating because of the strong van der Waals interaction between PE chains and CNTs. [45][46][47] Besides, many scholars have also explored the formation mechanism of hybrid shishkebab structure, they proposed that PE chains firstly formed a uniform coating along the tube axis before starting to kebab growth. [48][49][50] A uniform polymer coating played a key role in the formation of hybrid shish-kebab structure.…”

Section: The Formation Mechanism Of Hybrid Shish-kebab Structures Formentioning

confidence: 99%

The massive formation of hybrid shish‐kebab structures in HDPE/PA6 microfibril blend subjected to melt second flow

Xie

Xia

Huang

et al. 2017

J of Applied Polymer Sci

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During the melt second flow process, the synergetic effect of intense shear and polyamide 6 (PA6) microfibrils finally results in the massive formation of highly oriented crystalline structures in the entire thickness of high‐density polyethylene (HDPE)/PA6 microfibril blend. Interestingly, not only does the small microfibril induce HDPE crystallization to form typical hybrid shish–kebab structure, but the large microfibril (about 2 μm in diameter) also induces the formation of local hybrid shish–kebab structure. For the small PA6 microfibril, the oriented HDPE chains caused by the intense shear are absorbed on the whole surface of the microfibril and then a complete polymer underlayer is formed. Subsequently, the crystal nuclei appear on the underlayer, and then the other oriented HDPE chains overgrow from the nuclei in the form of folded chains and grow perpendicular to the microfibril. Finally, the typical hybrid shish–kebab structure is formed. While for the large PA6 microfibril, a few HDPE chains can be still absorbed on the microfibril surface due to the high surface energy of PA6. However, the driving force is insufficient to absorb largely oriented HDPE chains to form complete hybrid shish but only local adsorption layer, so the local hybrid structure is formed. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45274.

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Section: The Formation Mechanism Of Hybrid Shish-kebab Structures Formentioning

confidence: 99%

The massive formation of hybrid shish‐kebab structures in HDPE/PA6 microfibril blend subjected to melt second flow

Xie

Xia

Huang

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The concentration gradient between the growing lamellae causes the periodic structure of shish-kebab. [4,5] This theory has been well defined for describing the formation of the hybrid shish-kebab when the shish material is carbon nanotube or carbon nanofiber, with a different material for the kebab. However, for the self-induced nanohybrid shish-kebab (SINSK) structure, the crystalline lattice parameters are identical for the crystals both in the shish and kebab, and the physical and chemical characteristics are also the same, although whether the epitaxy or the soft epitaxy mechanism is taking effect is still unclear.…”

Section: Doi: 101002/macp201700414mentioning

confidence: 99%

“…In the crystallization process, strict lattice matching does not occur but the molecular chains are adsorbed onto the surface of shish and form a homogenous coating, and then the polymer chains orient, nucleate, and grow. The concentration gradient between the growing lamellae causes the periodic structure of shish–kebab . This theory has been well defined for describing the formation of the hybrid shish–kebab when the shish material is carbon nanotube or carbon nanofiber, with a different material for the kebab.…”

Section: Introductionmentioning

confidence: 99%

A Prerequisite of the Poly(ε‐Caprolactone) Self‐Induced Nanohybrid Shish–Kebab Structure Formation: An Ordered Crystal Lamellae Orientation Morphology of Fibers

Wang

Gao

et al. 2017

Macro Chemistry & Physics

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The shish–kebab structure has been extensively applied in many fields; however, the formation mechanism is still an open question. In this study, different electrospun poly(ε‐caprolactone) (PCL) fibers are applied as the shish material in a self‐induced crystallization process, and two different self‐induced crystal structures are obtained. The PCL fibers with an ordered crystalline morphology lead to an induced crystalline structure with the crystal lamellae perpendicular to the fiber axis. However, the PCL fibers with a disordered structure induce a complicated (less ordered) crystalline lamellae morphology. Investigation of the surface crystalline structure reveals that the self‐induced nanohybrid shish–kebab (SINSK) structure follows a lattice matching and epitaxial growth mechanism. The internal crystalline structure of PCL nanofibers plays a dominant role in the formation of the SINSK structure. This study may prove helpful in screening materials for formation of the SINSK structure.

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“…Nowadays, polymer‐based nanocomposites have been widely used in various fields due to their excellent mechanical properties . The presence of nanofillers can significantly alter crystallization behaviors of polymers, including crystallinity and crystalline morphology . In general, nanofillers act as nucleating agents to promote crystallization and induce the formation of crystal structures with various morphologies, which remarkably depend on filler size, filler content, and polymer–filler interaction .…”

Section: Introductionmentioning

confidence: 99%

Competition Between Interfacial Interaction and Microphase Separation in Crystallization of Filled Block Copolymers

Liu

Zhou

Liu

et al. 2019

J Polym Sci B Polym Phys

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Understanding the effect of repulsive interaction between blocks on crystallization in block copolymers is beneficial for the design and development of sophisticated nanostructures. Dynamic Monte Carlo simulations were performed to reveal the crystallization mechanism of block copolymers containing onedimensional nanofiller under different repulsive interaction strengths between crystallizable and noncrystallizable blocks. During crystallization, crystalline morphology is determined by the competition between segmental orientation perpendicular to microphase interfaces dominated by microphase separation and that along the direction of the long axis of the nanofiller controlled by interfacial interaction. As the repulsive interaction between different blocks is strengthened, the competition between microphase separation and interfacial interaction is intensified, eventually leading to an increase in crystallization rate and a degradation in crystalline morphology.

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Nucleation details of nanohybrid shish-kebabs in polymer solutions studied by molecular simulations

Cited by 48 publications

References 39 publications

The massive formation of hybrid shish‐kebab structures in HDPE/PA6 microfibril blend subjected to melt second flow

The massive formation of hybrid shish‐kebab structures in HDPE/PA6 microfibril blend subjected to melt second flow

A Prerequisite of the Poly(ε‐Caprolactone) Self‐Induced Nanohybrid Shish–Kebab Structure Formation: An Ordered Crystal Lamellae Orientation Morphology of Fibers

Competition Between Interfacial Interaction and Microphase Separation in Crystallization of Filled Block Copolymers

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