Hierarchic structure and mechanical property of glass fiber reinforced isotactic polypropylene composites molded by multiflow vibration injection molding

Mi, Dashan; La, Renxi; Wang, Tao; Zhang, Xiongwei; Zhang, Jie

doi:10.1002/pc.23868

Cited by 12 publications

(8 citation statements)

References 44 publications

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“…This approach decreases the intensity of the shish-kebab. This phenomenon also occurred in our previous experiments when glass fibers were added to PP [ 42 ]. Moreover, the high shear stress necessary to form a shish-kebab can break and decrease the performance of PET fibers.…”

Section: Resultssupporting

confidence: 79%

Effects of Phase Morphology on Mechanical Properties: Oriented/Unoriented PP Crystal Combination with Spherical/Microfibrillar PET Phase

Wang

Kuzmanović

et al. 2019

Polymers

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In situ microfibrillation and multiflow vibrate injection molding (MFVIM) technologies were combined to control the phase morphology of blended polypropylene (PP) and poly(ethylene terephthalate) (PET), wherein PP is the majority phase. Four kinds of phase structures were formed using different processing methods. As the PET content changes, the best choice of phase structure also changes. When the PP matrix is unoriented, oriented microfibrillar PET can increase the mechanical properties at an appropriate PET content. However, if the PP matrix is an oriented structure (shish-kebab), only the use of unoriented spherical PET can significantly improve the impact strength. Besides this, the compatibilizer polyolefin grafted maleic anhydride (POE-g-MA) can cover the PET in either spherical or microfibrillar shape to form a core–shell structure, which tends to improve both the yield and impact strength. We focused on the influence of all composing aspects—fibrillation of the dispersed PET, PP matrix crystalline morphology, and compatibilized interface—on the mechanical properties of PP/PET blends as well as potential synergies between these components. Overall, we provided a theoretical basis for the mechanical recycling of immiscible blends.

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Section: Resultssupporting

confidence: 79%

Effects of Phase Morphology on Mechanical Properties: Oriented/Unoriented PP Crystal Combination with Spherical/Microfibrillar PET Phase

Wang

Kuzmanović

et al. 2019

Polymers

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“…It is well known that the macroscopic performance of the product is substantially dependent on its microstructure [6][7][8]. In the past, considerable efforts have been devoted to adapt the microstructures of GFRPP products and improve their macroscopic performance [9][10][11][12][13][14][15]. It is presumed that the mechanical properties of GFRPP products significantly depend on the combined effects of glass fiber orientation and distribution, fiber-matrix interface bonding strength conditions, and state of matrix crystallization, while some surface defects, such as flow marks, floating fibers, weld lines, and jetting marks cannot be avoided through the CIM process [16,17].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Tensile Property, and Surface Quality of Glass Fiber-Reinforced Polypropylene Parts Molded by Rapid Heat Cycle Molding

Liu

et al. 2020

Advances in Polymer Technology

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The microstructure of a molded product considerably influences its macroscopic properties. In this study, the influence of molding process on microstructure, tensile property, and surface quality was explored on the glass fiber-reinforced polypropylene (GFRPP) parts molded by rapid heat cycle molding (RHCM) and conversion injection molding (CIM). Tensile strength and surface gloss were chosen to measure macroscopic properties of the molded parts. The microstructure including multilayer, fiber orientation, crystallinity, and fiber-matrix bonding strength were analyzed by simulations, scanning electron microscopy, wide-angle X-ray diffraction, and dynamic mechanical analysis. The relationship between the macroscopic properties and microstructure of the RHCM samples was also discussed. The results indicate that as the mold cavity surface temperature increases, the tensile strength increases firstly and decreases thereafter. The tensile strength of RHCM parts reached the maximum at the mold heating temperature of 60°C. It is also observed that the surface gloss of the sample increases as the mold cavity surface temperature rises, and the increase of surface gloss decreases distinctly with the mold heating temperature higher than 90°C.

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“…The meridional maxima in the SAXS pattern should also be attributed to the structures of the kebab‐like lamellar, which were perpendicular to the flow direction. By contrast, the equatorial streak should be attributed to the formation of shish or microcracks, and/or oriented α daughter lamellae growing epitaxially . In this case, the crossed signal in the SAXS was potentially formed by crossed lamellas generated through the self‐organizing β‐NA.…”

Section: Resultsmentioning

confidence: 95%

Quantification of shish–kebab and β‐crystal on the mechanical properties of polypropylene

Zhou

Zhang

2017

J of Applied Polymer Sci

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ABSTRACT:The oriented "shish-kebab" structure and b-crystal can enhance the mechanical properties of polypropylene products. In this regard, equipment and b-nucleation agents have been developed or modified to form shish-kebab and b-crystal. However, the effect of shish-kebab/b-crystal proportion on the mechanical properties of polypropylene remains unclear. The answer is crucial but remains a challenge because of the difficulty in manipulating the shish-kebab proportion. In this work, we used a self-made multiflow vibrate-injection molding, which can provide a controllable shear flow, to produce samples with different shear-layer thicknesses. The shish-kebab proportion was represented by R, which is the thickness ratio of the shear layer to that of the whole sample. Results showed that the tensile strength exponentially increased, whereas the elongation at break exponentially decreased, with R. The impact strength remained constant with R, indicating that the shish-kebab and b-crystal possessed similar toughening effects. This work proposes a schematic to interpret the strengthening mechanism involved and presents a method of establishing and controlling the mechanical properties of polypropylene samples by using shish-kebab structures and b-crystals. V C 2017 Wiley Periodicals, Inc. J. Appl.Polym. Sci. 2017, 134, 45052.

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Hierarchic structure and mechanical property of glass fiber reinforced isotactic polypropylene composites molded by multiflow vibration injection molding

Cited by 12 publications

References 44 publications

Effects of Phase Morphology on Mechanical Properties: Oriented/Unoriented PP Crystal Combination with Spherical/Microfibrillar PET Phase

Effects of Phase Morphology on Mechanical Properties: Oriented/Unoriented PP Crystal Combination with Spherical/Microfibrillar PET Phase

Microstructure, Tensile Property, and Surface Quality of Glass Fiber-Reinforced Polypropylene Parts Molded by Rapid Heat Cycle Molding

Quantification of shish–kebab and β‐crystal on the mechanical properties of polypropylene

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