The influence of blowing agent addition, talc filler content, and injection velocity on selected properties, surface state, and structure of polypropylene injection molded parts

Palutkiewicz, P.; Trzaskalska, M.; Bociąga, E.

doi:10.1177/0262489319873642

Cited by 10 publications

(9 citation statements)

References 19 publications

(22 reference statements)

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“…The research revealed that with the increasing talc content, changes to the measured mechanical parameters were observed. On the other hand, increasing talc concentration caused an increase in the hardness up to some point (6 or 9 wt.%), after which its decrease was noticed [48,49]. The appearance of this type of dependence is explained by the uneven distribution of the filler, as the filler type and its distribution are the most important factors affecting the mechanical properties of PP/talc compounds [48].…”

Section: Resultsmentioning

confidence: 99%

The Structure and Mechanical Properties of the Surface Layer of Polypropylene Polymers with Talc Additions

et al. 2020

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In the presented work the influence of different 3MgO·4SiO2·H2O (talc) contents in polypropylene samples on the structure, hardness, elasticity, and friction of the surface layer was investigated. The talc content ranged from 0 to 25 wt.%, and all the samples were obtained in the same conditions by the injection molding process. The analysis of the microstructure was performed by X-ray diffraction. Changes in the hardness and elasticity were determined for three different depths (300, 800, and 4000 nm) using an ultra nano tester. For the purpose of the examination of the friction properties of the obtained compounds, a nano-scratch tester was applied. Increasing the talc content caused growth in the indentation modulus and hardness values. Simultaneously, an effect of decreasing hardness and elastic modulus with increasing indentation depth was observed. The smallest effect size was observed for 25 wt.% talc content, which might suggest that talc addition increased the homogeneity of the observed composites. Scratch tests showed increasing scratch resistance along with increasing talc content for both constant and progressive loads. The growth in talc concentration led to a decrease in the degree of the polypropylene (PP) crystallinity of the surface layer. The exfoliation process occurred in PP composites.

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Section: Resultsmentioning

confidence: 99%

The Structure and Mechanical Properties of the Surface Layer of Polypropylene Polymers with Talc Additions

et al. 2020

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“…Polymers and Fillers Molded Part Thickness, mm [4,7,8,11,13,16,22,23] PP GF20; PP/LDPE blends; PP + GF + Talc; PP-TPU; PP CF20; PP CF30; PP + EPDM + TALC 2.4-4.0 [6,9,15,17] PA66 GF 30 1.5-4.0 [7,24] PLA/PHBV; PLA/PTFE (fibril) 3.3-4.0 [10,12] PC; PC/ABS 1.7-4.0 [14,25] PS 3.0…”

Section: Entry In the Literature Listmentioning

confidence: 99%

The Microcellular Structure of Injection Molded Thick-Walled Parts as Observed by In-Line Monitoring

2020

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The aim of the study was to detect the influence of nitrogen pressure on the rheological properties and structure of PA66 GF30 thick-walled parts, produced by means of microcellular injection molding (MIM), using the MuCell® technology. The process was monitored in-line with pressure and temperature sensors assembled in the original injection mold. The measured data was subsequently used to evaluate rheological properties inside an 8.4 mm depth mold cavity. The analysis of the microcellular structure was related to the monitored in-line pressure and temperature changes during the injection process cycle. A four-times reduction of the maximum filling pressure in the mold cavity for MIM was found. At the same time, the holding pressure was taken over by expanding cells. The gradient effect of the cells distribution and the fiber arrangement in the flow direction were observed. A slight influence of nitrogen pressure on the cells size was found. Cells with a diameter lower than 20 µm dominate in the analyzed cases. An effect of reduction of the average cells size in the function of distance to the gate was observed. The creation of structure gradient and changes of cells dimensions were evaluated by SEM images and confirmed with the micro CT analysis.

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“…Their addition also affects the processing of the polymer [7]. The filler can be introduced into the polymer by various methods including melt-mixing [8], melt extrusion [9], and injection molding [10]. Mineral fillers for thermoplastics often include natural sedimentary rocks, like calcium carbonate [11], mica, clinoptilolite [12], zeolites [13], kaolin [14], silica [15], titanium dioxide [16] or diatomaceous earth [17], and clay minerals with a two-layer structure (kaolin-serpentine group) or three-layer structure (talc-pyrophyllite group, mica group, etc.)…”

Section: Introductionmentioning

confidence: 99%

Opoka—Sediment Rock as New Type of Hybrid Mineral Filler for Polymer Composites

et al. 2021

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The work presents a comprehensive profile of the physicochemical characteristics of opoka sedimentary rock in the context of its use as a hybrid filler for thermoplastics. Determining the functional parameters of the studied filler was the main aim of this research. Thermal treatment leads to changes in its morphology and phase composition. A wide range of physicochemical techniques was used, such as low-temperature nitrogen adsorption, FT-IR, TGA, XRD, optical, and electron microscopy. The susceptibility of the material to micronisation was also tested (ball milling). Due to its widespread occurrence, opoka can be an attractive alternative to fillers such as silica or chalk. In order to verify this statement, polypropylene composites thereof were prepared by melt blending and injection molding, and studied by mechanical testing and microscopic imaging.

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The influence of blowing agent addition, talc filler content, and injection velocity on selected properties, surface state, and structure of polypropylene injection molded parts

Cited by 10 publications

References 19 publications

The Structure and Mechanical Properties of the Surface Layer of Polypropylene Polymers with Talc Additions

The Structure and Mechanical Properties of the Surface Layer of Polypropylene Polymers with Talc Additions

The Microcellular Structure of Injection Molded Thick-Walled Parts as Observed by In-Line Monitoring

Opoka—Sediment Rock as New Type of Hybrid Mineral Filler for Polymer Composites

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