Synergisms of mechanical properties in blends of semi-crystalline polymers

Gross, Beth A.; Peterman, J.

doi:10.1007/bf00552998

Cited by 23 publications

(42 citation statements)

References 16 publications

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“…In the skin layer, more compact shish‐kebab structure of PE phase, with some perfect shish‐kebab structure of PP phase inserting, can be seen. In the shear layer, PE lamellae arrange inclined about ±40° apart from the flow direction; this peculiar lamellae arrangement is exactly the typical epitaxy crystalline morphology, which is quite identical with the transmission electron microscopy morphology of epitaxy crystalline in many previous researches . In particular, the corresponding 2D‐SAXS pattern also shows a typical six‐spots pattern, which has been widely believed to be a proof of the existence of epitaxy structures.…”

Section: Resultssupporting

confidence: 83%

“…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: 56%

“…Although these methods have successfully obtained the epitaxial structures in practical samples, making it possible for the industrial production of iPP/PE blends with special epitaxial structures. One thing to note is that the specific morphology of epitaxial structures in those samples is not clear, even though X‐ray patterns do give a strong proof of the existence of epitaxial structures according to many previous researches . Obviously, there is reason to believe that the morphology is probably a little changed.…”

Section: Introductionmentioning

confidence: 89%

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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%

Section: Resultssupporting

confidence: 56%

Section: Introductionmentioning

confidence: 89%

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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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“…Recently, a unique orthogonal orientation, where polymeric chains align perpendicular to the drawing direction, has been occasionally reported in heterogeneous systems such as block copolymers, immiscible blends and organic/inorganic composites. Several models involving the epitaxial crystallization,8–10 thermal shrinkage stress,11,12 confinement of crystal growth,13–21 and trans‐crystallization22,23 have been employed to interpret such a behavior. However, it has rarely occurred in homogenous systems.…”

Section: Introductionmentioning

confidence: 99%

Uniaxial Drawing of Poly[(R)‐3‐hydroxybutyrate]/Cellulose Acetate Butyrate Blends and Their Orientation Behavior

Park

Tanaka

Doi

et al. 2005

Macromolecular Bioscience

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Miscible blends of PHB and CAB were prepared by the solvent-casting method with various blend compositions, and their orientation behavior was investigated during uniaxial drawing. X-ray analysis revealed that the orientation of the crystallizable PHB component in the drawn PHB/CAB blends was changed from c-axis-orientation to a-axis-orientation with increasing CAB content. The a-axis-orientation was a result from the a-axis-oriented crystal growth caused by the intramolecular nucleation and the confined crystal growth. For quantitative assessment of the chain orientation, the Hermans orientation functions of the two respective components were obtained from the polarized FT-IR measurements. The orientation function of pure PHB stretched to 5 times of its initial length was approximately 0.8. However the value decreased rapidly with increasing CAB content, and it turned to a negative value from 30 wt.-% CAB content. This indicates that the PHB chains were aligned perpendicular to the drawing direction. On the contrary, the value of the CAB component remained almost unchanged at about 0.1 regardless of the blend composition and the annealing time, indicating that the CAB chains were constantly oriented parallel to the drawing direction without any chain relaxation. In addition, SAXS analysis suggested that the lamellar stacking direction also changed from parallel to perpendicular in the stretching direction with increasing CAB content.

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“…How to understand such a phenomenon? Since molecular chain orientation21, 29, 34 and possible epitaxy22, 35, 36 may have considerable influence on the impact strength of polymeric materials, we should take them into account.…”

Section: Resultsmentioning

confidence: 99%

Calix[6]pyrrole and Hybrid Calix[n]furan[m]pyrroles (n+m=6): Syntheses and Host–Guest Chemistry

et al. 2002

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Out of line? Theory predicts that [Ti(N3)4] should exhibit unprecedented linear TiNNN bond angles as a consequence of the α‐N atoms of the azide groups acting as tridentate donors into the empty tetrahedral d0 orbitals of a (+IV) Group 4 metal atom. The title compounds were prepared and characterized (see structure). They do not possess linear TiNNN angles because their coordination numbers exceed four.

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Synergisms of mechanical properties in blends of semi-crystalline polymers

Cited by 23 publications

References 16 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

Uniaxial Drawing of Poly[(R)‐3‐hydroxybutyrate]/Cellulose Acetate Butyrate Blends and Their Orientation Behavior

Calix[6]pyrrole and Hybrid Calix[n]furan[m]pyrroles (n+m=6): Syntheses and Host–Guest Chemistry

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