Can the Structures of Semicrystalline Polymers be Controlled Using Interfacial Crystallographic Interactions?

Zhou, Hongwei; Yan, Shouke

doi:10.1002/macp.201200530

Cited by 21 publications

(23 citation statements)

References 179 publications

(228 reference statements)

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“…This special reflection can be ascribed to the epitaxial growth of PE lamellae onto PP lamellae, as it has been reported in many researches . PE crystallizes on the surface of the iPP substrate, with its chain ±50° apart from the chain direction of the iPP substrate, and two contact planes are assigned to be (100) PE and (010) PP …”

Section: Resultssupporting

confidence: 83%

Insight into understanding the evolution of the epitaxy crystallization in isotactic polypropylene and polyethylene blends

Zhou

Hou

et al. 2017

Polymers for Advanced Techs

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In this article, epitaxial structures have been successfully obtained in the isotactic polypropylene (iPP)/polyethylene (PE) blends by an accessible injection molding methods. By studying a series of iPP/PE blends, the evolution of the epitaxial growth of PE lamellae on the oriented iPP lamellae has been detailedly discussed via wide‐angle X‐ray diffraction, small‐angle X‐ray scattering, scanning electron microscopy and differential scanning calorimetry. Unexpectedly, the exactly epitaxial angles between peculiarly arranged PE lamellae and oriented PP lamellae are all larger than the classical epitaxy theory value of 50°, and it even increases gradually with increasing PP content. It is inferred that the special crystallization of PE is the consequence of joint construction of the oriented PP crystals and the continuous intense shear field provided by pressure vibration injection molding. The epitaxial structures play a positive role in the interfacial connection between two components; thus, the mechanical properties of the blends are improved. This work provides an insight understanding on the formation mechanism of the epitaxy crystallization under shear field. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 83%

Insight into understanding the evolution of the epitaxy crystallization in isotactic polypropylene and polyethylene blends

Zhou

Hou

et al. 2017

Polymers for Advanced Techs

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“…It is a simple and versatile way for orienting a wide variety of crystalline materials. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Surface-induced epitaxy is based on favorable crystallographic interactions and defines the crystallographic orientation of the overgrowing polymer. It can control the structure of semi-crystalline polymers in different ways: mutual molecular orientation, crystal structure polymorphs, and face-on or side-on orientation of the backbone for conjugated polymers.…”

Section: Polypropylenementioning

confidence: 99%

“…Oriented overgrowth of a foreign material on oriented crystalline substrates is a process known as epitaxy. It is a simple and versatile way for orienting a wide variety of crystalline materials . Surface‐induced epitaxy is based on favorable crystallographic interactions and defines the crystallographic orientation of the overgrowing polymer.…”

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confidence: 99%

Oriented Overgrowths of Poly(l‐Lactide) on Oriented Isotactic Polypropylene: A Sequence of Soft and Hard Epitaxies

Guan

Zhang

Sun

et al. 2018

Macromol. Rapid Commun.

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The crystallization behavior of an amorphous poly(l-lactide) (PLLA) layer deposited on uniaxially oriented isotactic polypropylene (iPP) substrate is been studied by atomic force microscopy (AFM) and electron microscopy combined with electron diffraction. A patterned PLLA structure with two fixed lamella and chain orientations is observed. Electron diffraction demonstrates that the major lamellar set is oriented with molecular chains perpendicular to the chain direction of the iPP. The minor lamellar set is inclined at ≈64° to both the iPP chain axis direction and the lamellae of the major set as judged from both the bright field electron micrograph and the AFM image. The orientation of the main set is explained in terms of "soft" epitaxy or graphoepitaxy, in which PLLA chains oriented parallel to the ditches of the iPP substrate caused by alternatively arranged crystalline and amorphous regions. The minor set is due to a homoepitaxy of PLLA with parallelism of the helical paths. The orientation of this minor set of lamellae therefore depends on and can help determine the chirality-l or d-of the PLA investigated.

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Section: Techniques For Preparing Highly Oriented Polymer Thin Filmsmentioning

confidence: 99%

Preparation and Self‐Repairing of Highly Oriented Structures of Ultrathin Polymer Films

Xin

Hou

et al. 2019

Macro Chemistry & Physics

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Thin and ultrathin polymer films play an important role in a variety of applications, such as electronics, liquid crystal alignment, adhesion, and so on. It is well established that the properties of semicrystalline polymeric materials depend remarkably on their multiscale structures; for example, an increase of more than a factor of 100 has been reported for the electrical conductivity of doped and aligned conjugated macromolecules compared with their nonoriented counterparts. Consequently, sophisticated methods have been developed for preparing highly oriented polymer ultrathin films. It should be pointed out that the highly oriented crystalline structure of polymers can be maintained only at temperatures below their melting points. Otherwise, structure rearrangement will result in the loss of orientation and therefore the properties. Therefore, self‐repairing of highly oriented polymer structures is of great significance for the long‐term application of polymer thin films in some specific fields. In this review paper, the preparation and self‐repair of the highly oriented structure of polymer thin films is described in the hopes that this will afford useful information for further development of polymeric materials for advanced applications.

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Can the Structures of Semicrystalline Polymers be Controlled Using Interfacial Crystallographic Interactions?

Cited by 21 publications

References 179 publications

Insight into understanding the evolution of the epitaxy crystallization in isotactic polypropylene and polyethylene blends

Insight into understanding the evolution of the epitaxy crystallization in isotactic polypropylene and polyethylene blends

Oriented Overgrowths of Poly(l‐Lactide) on Oriented Isotactic Polypropylene: A Sequence of Soft and Hard Epitaxies

Preparation and Self‐Repairing of Highly Oriented Structures of Ultrathin Polymer Films

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