Polymorphic structures phase diagram of shear-induced isotactic polypropylene/carbon fiber cylindrites

Zhao, Jing; Chen, Lu; Guo, Shuo; Wang, Ke; Fu, Qiang

doi:10.1016/j.matdes.2018.04.030

Cited by 11 publications

(2 citation statements)

References 41 publications

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“…Adding fiber into polymer materials is another commonly used method to strengthen the matrix. , However, under a strong shear field, the added fiber is easy to break, which will even lead to a decrease in the strength of the material . If the fiber structure can be formed spontaneously in the matrix during processing, then this problem can be greatly improved.…”

Section: Introductionmentioning

confidence: 99%

Preparation of PPR/PS Blends by Multiflow Vibration Injection Molding: Influence of Shish–Kebab Structures and In Situ Fibers

Min,

Hu,

Yan

et al. 2024

Ind. Eng. Chem. Res.

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PPR resin has the advantages of good transparency, high impact strength, and low welding temperature and is widely used in pipelines, automobile parts, furniture, and packaging. However, a low tensile strength limits its application in other fields. In this work, PS is chosen to modify PPR, and multiple shear fields are exerted on the polymer melt during the packing stage. The results demonstrate that PS forms in situ fibers, and a large number of shish−kebab and hybrid shish−kebab structures can be detected. Compared with the conventional injection-molded sample, the crystallinity increases from 32.9 to 35.8% and the tensile strength increases from 18.37 to 47.22 MPa. Meanwhile, the impact strength remains as high as 28.04 kJ/m 2 . This work achieves excellent comprehensive mechanical properties of PPR, and it is of great theoretical and practical significance for its broad application.

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Section: Introductionmentioning

confidence: 99%

Preparation of PPR/PS Blends by Multiflow Vibration Injection Molding: Influence of Shish–Kebab Structures and In Situ Fibers

Min,

Hu,

Yan

et al. 2024

Ind. Eng. Chem. Res.

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“…It can be said that conditions for obtaining the different crystal forms are now reasonably well understood. For example, crystallization in a temperature gradient, , shear-induced crystallization, − and addition of a β-nucleating agent have all been reported to produce the β-form. , On the other hand, i- PP crystallization under high pressure and random incorporation of a comonomer can result in the γ-form. ,,− …”

Section: Introductionmentioning

confidence: 99%

3D Morphology of Different Crystal Forms in β-Nucleated and Fiber-Sheared Polypropylene: α-Teardrops, α-Teeth, and β-Fans

et al. 2023

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Polymorphism of semicrystalline polymers has significant influence on their physical properties, with each form having its advantages and disadvantages. However, real-life polymer processing often results in different coexisting crystal polymorphs, and it remains a challenge to determine their shape, spatial distribution, and volume fraction. Here, i-polypropylene (i-PP) sheets containing both αand β-forms were prepared either by adding β-nucleating agent or by fiber pulling-induced crystallization. By adding a compatible dye that is partially rejected from the growing crystalline aggregates (spherulites and cylindrites), we visualize the shape of these objects in 3D using two-photon fluorescence confocal microscopy. To distinguish between crystal forms, we take advantage of the difference in dye-retaining ability of the αand β-aggregates. Even in 2D, fluorescence microscopy (FM) distinguishes the two crystal forms better than polarized microscopy. In 3D imaging, the volume fraction and spatial distribution of αand β-forms in different morphological types could be determined quantitatively. Morphologies described as α-teeth, β-fans, and α-teardrops were visualized for the first time in 3D. Furthermore, internal and surface microcracks were seen to be associated predominantly with the β-form and around the fiber. Spatial distribution of αand β-forms was also determined by scanning with a synchrotron X-ray beam. Good agreement was obtained with 3D microscopy, but XRD could not match the detail obtainable by the tomography. The work demonstrates the ability of the 3D imaging method to distinguish different crystal forms and their specific morphologies.

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The synergetic effect of zinc phthalate and carboxymethyl cellulose–carbon nanotube of glass fibers surfaces on improving strength and toughness of polypropylene composite

Fang

Cheng

Zhang

et al. 2020

Journal of Polymer Science

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The interfacial interaction between glass fibers (GFs) and polypropylene (PP) resin is the key factor which affects the properties of GFs reinforced PP composites. The β‐transcrystallization (β‐TC) structure induced by β‐nucleating agent (β‐NA) at the interface is beneficial to improving the interfacial performance and comprehensive mechanical properties. However, due to the poor adhesive ability, it is difficult to introduce β‐NAs onto GFs surface directly. In this work, for solving above problem, the sodium carboxymethyl cellulose (CMC) and NH2 functionalized multiwalled carbon nanotubes (CNTs) were used to construct the network structure on GFs (CMC‐CNT‐GF) through plenty of active groups. Furthermore, the zinc phthalate (ZnPht, β‐NA) was synthesized and coated on GFs surface by hydrogen bonds interaction with CMC‐CNT and physical anchoring effect (ZnPht@CMC‐CNT‐GF). Finally, the hybrid GFs reinforced PP composite (iPP/ZnPht@CMC‐CNT‐GF) was prepared, which exhibited enhanced tensile, flexural, and impact strength by 20.1, 9.3, and 33.3%, respectively when compared with the iPP/raw GF due to the formation of β‐TC and improvement of interfacial adhesion. This study provides an effective strategy to introduce β‐NAs on GFs with network structure for improving interfacial properties by inducing β‐TC to enhance the strength and toughness of composite, which could be applied in other fiber/semicrystalline polymer systems.

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Polymorphic structures phase diagram of shear-induced isotactic polypropylene/carbon fiber cylindrites

Cited by 11 publications

References 41 publications

Preparation of PPR/PS Blends by Multiflow Vibration Injection Molding: Influence of Shish–Kebab Structures and In Situ Fibers

Preparation of PPR/PS Blends by Multiflow Vibration Injection Molding: Influence of Shish–Kebab Structures and In Situ Fibers

3D Morphology of Different Crystal Forms in β-Nucleated and Fiber-Sheared Polypropylene: α-Teardrops, α-Teeth, and β-Fans

The synergetic effect of zinc phthalate and carboxymethyl cellulose–carbon nanotube of glass fibers surfaces on improving strength and toughness of polypropylene composite

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