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Journal articles on the topic 'Polypropylene Mechanical properties'

Author: Grafiati

Published: 4 June 2021

Last updated: 28 January 2023

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1

S, Karthik A., and Dr S. V. Gorabal. "A Study on Mechanical Properties of E-Glass Polypropylene Epoxy and S-Glass Polypropylene Epoxy Composites." International Journal of Trend in Scientific Research and Development Volume-2, Issue-5 (August 31, 2018): 571–75. http://dx.doi.org/10.31142/ijtsrd15903.

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2

KUNIMITSU, TATSUMA. "Mechanical Properties of Polypropylene Fiber." Sen'i Gakkaishi 77, no. 4 (April 15, 2021): P—150—P—154. http://dx.doi.org/10.2115/fiber.77.p-150.

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3

Shubhra, Quazi TH, AKMM Alam, and MA Quaiyyum. "Mechanical properties of polypropylene composites." Journal of Thermoplastic Composite Materials 26, no. 3 (December 12, 2011): 362–91. http://dx.doi.org/10.1177/0892705711428659.

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4

Ogata, Nobuo, Michihiro Miyagoshi, Takashi Ogihara, and Kokichi Yoshida. "Mechanical Properties of Polypropylene Blends." Sen'i Gakkaishi 51, no. 6 (1995): 248–56. http://dx.doi.org/10.2115/fiber.51.6_248.

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5

Lu, Chun. "Mechanical Properties of Polypropylene Fiber Reinforced Concrete Pavement." Advanced Materials Research 739 (August 2013): 264–67. http://dx.doi.org/10.4028/www.scientific.net/amr.739.264.

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concrete materials with low tensile strength, easy to crack, and the brittleness of the shortcomings in the polypropylene fiber concrete can improve performance. The compressive strength and flexural strength of the mechanical properties of polypropylene fiber reinforced concrete pilot study shows that the fiber content and curing age a great influence on the mechanical properties of polypropylene fiber reinforced concrete, the polypropylene fibers affordable dosage take1.5 percent is appropriate.

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6

Allahverdiyeva, Kh V. "PHYSICAL-MECHANICAL PROPERTIES OF NANOCOMPOSITES BASED ON GRAPHITE AND MODIFIED POLYOLEFINS." Chemical Problems 19, no. 4 (2021): 232–40. http://dx.doi.org/10.32737/2221-8688-2021-4-232-240.

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The influence of the graphite concentration on the main physical-mechanical properties of nanocomposites based on such polyolefin as high density polyethylene, low density polyethylene and polypropylene is considered. Properties such as tensile yield stress, ultimate tensile stress, and ultimate bending strength, elongation at break, heat resistance, flexural strength, MFI, and melting points are analysed. To improve the compatibility of the mixed components of the mixture, we used an Exxelor PO1040 compatibilizer for all grades of polyethylene and Exxelor PO1020 for polypropylene. Graphite was introduced into the composition of polyolefin at the following concentrations: 1.0, 3.0, 5.0, 10, 15, 20, and 30 wt%. As a result of the research, it was found that the introduction of graphite into the composition of polyolefin was accompanied by an improvement in strength characteristics with maximum at various concentrations. For high density polyethylene, the maximum values of strength characteristics are observed at 3.0 wt%, for low density polyethylene at 10 wt%, and for polypropylene at 5.0 wt% content of graphite. It revealed that such a difference in the value of the threshold concentration of graphite which provides the maximum value of strength indicators,was directly related to the degree of crystallinity of the polymer matrix.

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7

Mezey, Zoltán, and Tibor Czigány. "Mechanical Investigation of Hemp Fiber Reinforced Polypropylene with Different Types of MAPP Compatibilizer." Materials Science Forum 537-538 (February 2007): 223–30. http://dx.doi.org/10.4028/www.scientific.net/msf.537-538.223.

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Mechanical properties of hemp fiber reinforced polypropylene were investigated. Hemp fibers were carded together with polypropylene fibers, and needle punched. Composites were prepared by hot pressing of the PP/hemp mats. Hemp content was varied between 0 and 50 % by weight, in 10% steps. A treatment with two different maleic anhydride grafted polypropylenes was applied in order to increase the fiber/matrix surface adhesion. Tensile, three-point bending and Charpy tests were carried out on the treated and untreated composites.

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8

Yunus, Robiah Bt, N. H. Zahari, M. A. M. Salleh, and Nor Azowa Ibrahim. "Mechanical Properties of Carbon Fiber-Reinforced Polypropylene Composites." Key Engineering Materials 471-472 (February 2011): 652–57. http://dx.doi.org/10.4028/www.scientific.net/kem.471-472.652.

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In this paper, the mechanical properties of carbon fiber polypropylene composites prepared under various process conditions were investigated. Two different types of polypropylene composites were produced by mixing and compressing the mixtures using hot press. The mixture was prepared by mixing polypropylene with chopped carbon fiber and carbon fiber percentage (wt%) was varied. Mechanical properties investigated were tensile test, impact test, bending test and density test. The Scanning Electron Microscopy (SEM) was employed to study the morphology of the composites. The highest tensile strength was obtained for polypropylene (MFI 60) composites reinforced with 10 wt% carbon fiber. The composite also exhibited the best tensile and flexural properties.

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9

TAKAYAMA, Tetsuo, and Yasuhiro MORI. "Mechanical properties of nanofiber reinforced polypropylene." Proceedings of the Materials and Mechanics Conference 2017 (2017): OS0425. http://dx.doi.org/10.1299/jsmemm.2017.os0425.

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10

Cristina-Elisabeta, PELIN, STEFAN Adriana, PELIN George, DINCA Ion, FICAI Anton, ANDRONESCU Ecaterina, and VOICU Georgeta. "Mechanical Properties of Nanofilled Polypropylene Composites." INCAS BULLETIN 7, no. 2 (June 12, 2015): 113–21. http://dx.doi.org/10.13111/2066-8201.2015.7.2.11.

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11

Zihlif, A. M., and G. Ragosta. "Mechanical properties of talc-polypropylene composites." Materials Letters 11, no. 10-12 (August 1991): 368–72. http://dx.doi.org/10.1016/0167-577x(91)90136-t.

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12

Liang, J. Z., C. Y. Tang, R. K. Y. Li, and T. T. Wong. "Mechanical properties of polypropylene/CaCC3 composites." Metals and Materials 4, no. 4 (July 1998): 616–19. http://dx.doi.org/10.1007/bf03026368.

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13

Borysiak, Sławomir, and Dominik Paukszta. "Mechanical Properties of Lignocellulosic/Polypropylene Composites." Molecular Crystals and Liquid Crystals 484, no. 1 (April 17, 2008): 13/[379]—22/[388]. http://dx.doi.org/10.1080/15421400801901464.

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14

Mustapha, Kabiru, Rashidat Ayinla, Abdulraman Sikiru Ottan, and Tunji Adetayo Owoseni. "Mechanical properties of calcium carbonate/eggshell particle filled polypropylene Composites." MRS Advances 5, no. 54-55 (2020): 2783–92. http://dx.doi.org/10.1557/adv.2020.323.

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AbstractCalcium carbonate is widely used as a filler material in the production of polymer matrix composites and studies have shown that eggshell contains about 94% calcium carbonate. The effect of calcium carbonate from eggshell particles in polypropylene was studied in this work and the result compared with unreinforced polypropylene. Industrially synthesized calcium carbonate/eggshell particles were used as filler in polypropylene matrix with varying mass fractions from 5 to 20 wt. % at 5 wt. % increment. The produced samples were mechanically characterized for indentation hardness and uniaxial tensile properties using a Rockwell hardness tester and universal mechanical testing machine respectively. These properties were measured at different compositions to determine its compositional dependence. Microstructural analysis of the composites top and fracture surface was also carried out using scanning electron microscope to examine possible failure mode. The results were compared to measure the effect of reinforcement and the replacement criteria for the conventional calcium carbonate. The results obtained showed that calcium carbonate reinforced polypropylene has its highest tensile strength, elastic modulus and modulus of rupture at 5 wt. %, ductility and modulus of resilience at 10 wt. %, and hardness at 15 wt. %. The results also showed that granulated eggshell can provided appreciable improvement in the mechanical properties of polypropylene as obtainable in mineral calcium carbonate reinforced polypropylene.

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15

Long, Wu Jian, Han Xin Lin, Zhen Rong Chen, Kai Long Zhang, and Wei Lun Wang. "Mechanical Properties of Fiber Reinforced Self-Compacting Concrete." Applied Mechanics and Materials 470 (December 2013): 797–801. http://dx.doi.org/10.4028/www.scientific.net/amm.470.797.

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The mechanical strengths of self-compacting concrete (SCC) with different strengths and different fibers were investigated. By mechanics performance testing on concrete samples, it shows that the fiber can significantly reduce strength of the self-compacting concrete during curing period. The 28d tensile strength of self-compacting concrete can be improved when steel fiber, polypropylene fiber, or polyethylene fiber were used. Moreover, steel fiber can improve the 28d compressive strength; contrarily, polypropylene fiber and polyethylene fiber can reduce the 28d compressive strength.

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16

Chen, Huimin, Chunyan Xie, Chao Fu, Jing Liu, Xiuli Wei, and Dake Wu. "Orthogonal Analysis on Mechanical Properties of Basalt–Polypropylene Fiber Mortar." Materials 13, no. 13 (June 30, 2020): 2937. http://dx.doi.org/10.3390/ma13132937.

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Orthogonal test method was applied to analyze the strength properties of basalt-polypropylene mortar. The effect of basalt fiber length, polypropylene fiber length, basalt fiber volume content and polypropylene fiber volume content on the 28 d cube compressive strength and flexural strength were investigated. Test results show that comparing with flexural strength, the influence of basalt fiber length and polypropylene fiber length on compressive strength of mortar was greater than on flexural strength. The length of polypropylene fibers contributes the highest to the flexural strength. The effect of basalt fiber on mortar strength is the largest with 6 mm length and 4% content. Polypropylene fiber length has the greatest influence on the compressive strength of fiber mortar, followed by basalt fiber volume content. Volume content of polypropylene fiber has the greatest influence on flexural strength of fiber mortar, followed by polypropylene fiber length. According to the scoring of the efficacy coefficient method, the best ratio combination for compressive and flexural strength was the basalt fiber length of 9 mm, polypropylene fiber length of 6 mm, basalt fiber volume content of 4% and polypropylene fiber volume content of 4%. Compared with the blank samples, the 28 d compressive strength and 28 d flexural strength of the cement mortar samples were increased by 27.4% and 49% respectively. According to the test results, the properties of the fiber were analyzed and evaluated and the mechanism of fiber action and fiber microstructure were analyzed.

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17

Järvelä, Pentti, Li Shucai, and Pirkko Järvelä. "Dynamic mechanical properties and morphology of polypropylene/maleated polypropylene blends." Journal of Applied Polymer Science 62, no. 5 (October 31, 1996): 813–26. http://dx.doi.org/10.1002/(sici)1097-4628(19961031)62:5<813::aid-app14>3.0.co;2-t.

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18

Jayaram, M., J. Naresh, Karhik Thipparthi, and V. Kastro Kiran. "Assessment on mechanical properties of concrete with polypropylene fiber." IOP Conference Series: Earth and Environmental Science 982, no. 1 (March 1, 2022): 012004. http://dx.doi.org/10.1088/1755-1315/982/1/012004.

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Abstract Concrete is a versatile material that must meet certain strength criteria to maintain structural integrity. Although concrete has several advantages in terms of mechanical qualities and construction costs, its brittle nature is a drawback in those applications that require flexibility. However, the recent creation of concrete with polypropylene fiber-reinforced (PFRC) has provided a technical framework for addressing these issues. Polypropylene fibres have a tendency to bind the concrete mix. This reduces the rate of bleeding by slowing the settlement of coarse material. A slower rate of bleeding equals a slower rate of drying, which means less shrinkage breaking in the plastic. Polypropylene fibres act as crack stoppers in hardened concrete. The impact of polypropylene (PP) fibres on compressive strength, tensile strength, flexural strength, and workability for M 25 Grade concrete in both fresh and hardened states is investigated in this study. Polypropylene fibres were introduced at a percentage of 0.5%, 1%, 1.5 %, and 2% in this investigation, and the findings were tabulated.

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19

Vîlcea, Elena Janina, and Rodica Mariana Ion. "Mechanical Properties of Polypropylene - REOGARD 2000® Composite." Applied Mechanics and Materials 760 (May 2015): 317–22. http://dx.doi.org/10.4028/www.scientific.net/amm.760.317.

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"New materials" as they are called composite materials are designed with special features to meet some special requirements regarding: mechanical strength and rigidity, resistance to corrosion, resistance to chemical agents, low weight, dimensional stability, resistance to varying loads, shock and wear, insulating properties and aesthetics. The main advantage of these materials is the high ratio between strength and weight density. This paper deals with the tests of a composite materials as polypropylene (PP) materials, firstly as pure and recovered polypropylene materials, and secondly, the same materials with the addition of 5%, 10%, 15%, 20%, 25% Reogard 2000®. This study led to the conclusion that the best mechanical properties of polypropylene is for 20% concentration of Reogard2000®.

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20

Zhao, Yu, Ming Du, Ke Xin Zhang, and Liang Gao. "Effect of Modified Diatomite on Crystallinity and Mechanical Properties of Polypropylene." Materials Science Forum 913 (February 2018): 551–57. http://dx.doi.org/10.4028/www.scientific.net/msf.913.551.

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The different coupling agent is used for diatomite modification. The diatomite with different content are melt and mixed with polypropylene to prepare diatomite/polypropylene composites. The modification effects of different coupling agent on diatomite and the influence of agent and diatomite contents on crystallization behavior of polypropylene and mechanical properties of composites are investigated. The results show that different coupling agents have the modification effects on diatomite influence crystallization of polypropylene but the aluminum agent is better than other agents. With the increase of the content of aluminum acid ester coupling agent, the size of bubble pore is uniform, and then the compressive strength reaches to a maximum when aluminum acid ester coupling agent content is 1%. With the increase of the content of diatomite, the porosity of bubble pore of diatomite/polypropylene composite material is gradually increases. The crystallinity of polypropylene and yield strength reach to a maximum (48.15% and 21.5%) when diatomite content is 30%. In addition, the diatomite/polypropylene composites have better compressive strength than the others.

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21

Zhou, Jing Hai, and Hong Xiang. "Research on Mechanical Properties of Recycled Fiber Concrete." Applied Mechanics and Materials 94-96 (September 2011): 1184–87. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.1184.

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At present, green energy saving idea, aimed at protecting environment and saving energy, now has become the guiding philosophy of modern architecture. Based on this, recycled carpet waste fibers for textile mechanical properties of concrete were discussed in this paper. The application of polypropylene fiber concrete abroad has been widely used, which is becoming more and more popularly in China recent years. Meanwhile, research on the application of recycled polypropylene fiber concrete is still scarce. The experiment of this paper adopt waste polypropylene fibers as reinforcing fiber, and we make the standard specimen which size is . We use the specimen to do the research of mechanical properties of compressive strength and observing the variation of compressive strength of concrete specimen in different fiber volume. We discovered that when we add volume of 0.12% recycled polypropylene fiber and the length is 19mm, the compressive strength of concrete increases greatly. We draw the conclusion that the compressive strength of recycled fiber concrete is better than ordinary one from the experiment. In addition, if such concrete was used widely, we may reach the goals of conserving resources and protecting the environment.

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22

Iroh, J. O., and J. P. Berry. "Mechanical properties of nucleated polypropylene and short glass fiber-polypropylene composites." European Polymer Journal 32, no. 12 (December 1996): 1425–29. http://dx.doi.org/10.1016/s0014-3057(96)00078-x.

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23

Wang, Wei, and Jingshen Wu. "Interfacial influence on mechanical properties of polypropylene/polypropylene-grafted silica nanocomposites." Journal of Applied Polymer Science 135, no. 8 (October 25, 2017): 45887. http://dx.doi.org/10.1002/app.45887.

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24

Güldas, Abdulmecit, Mehmet Altuğ, and Servet Temel. "Mechanical properties of aluminum powder reinforced polypropylene." Materials Testing 59, no. 1 (January 5, 2017): 86–93. http://dx.doi.org/10.3139/120.110970.

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25

Eiras, Daniel, and Luiz Antonio Pessan. "Mechanical properties of polypropylene/calcium carbonate nanocomposites." Materials Research 12, no. 4 (2009): 517–22. http://dx.doi.org/10.1590/s1516-14392009000400023.

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26

TANAKA, Katsutoshi, and Kazuo NAKAYAMA. "Dynamic Mechanical Properties of Polyamide/Polypropylene Blend." KOBUNSHI RONBUNSHU 50, no. 6 (1993): 497–505. http://dx.doi.org/10.1295/koron.50.497.

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27

Ruksakulpiwat, Yupaporn, Nitinat Suppakarn, Wimonlak Sutapun, and Wandee Thomthong. "Vetiver–polypropylene composites: Physical and mechanical properties." Composites Part A: Applied Science and Manufacturing 38, no. 2 (February 2007): 590–601. http://dx.doi.org/10.1016/j.compositesa.2006.02.006.

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28

Chervakov, D. O., P. I. Bashtanyk, and M. V. Burmistr. "Modified Polypropylene with Improved Physical-Mechanical Properties." Mechanics of Composite Materials 51, no. 1 (March 2015): 93–98. http://dx.doi.org/10.1007/s11029-015-9479-6.

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29

Hao, Ayou, Haifeng Zhao, Wei Jiang, Lin Yuan, and Jonathan Y. Chen. "Mechanical Properties of Kenaf/Polypropylene Nonwoven Composites." Journal of Polymers and the Environment 20, no. 4 (July 4, 2012): 959–66. http://dx.doi.org/10.1007/s10924-012-0484-8.

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30

Nakayama, Kazuo, Kun Qi, and Xiao Hu. "Dynamic Mechanical Properties of Rolled Polypropylene Sheets." Polymers and Polymer Composites 9, no. 3 (March 2001): 151–56. http://dx.doi.org/10.1177/096739110100900301.

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31

Yao, Zhishu, Xiang Li, Cao Fu, and Weipei Xue. "Mechanical Properties of Polypropylene Macrofiber-Reinforced Concrete." Advances in Materials Science and Engineering 2019 (May 7, 2019): 1–8. http://dx.doi.org/10.1155/2019/7590214.

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To economically and reasonably solve the difficult problem of mine shaft support subject to complex geological conditions, we studied the mechanical properties of polypropylene macrofiber-reinforced concrete (PPMFRC). First, we selected test raw materials through an investigation and comparison of technical parameters. Second, using a preparation test, we obtained the composition of reference concrete of PPMFRC for the mine shaft lining structure, and test specimens were manufactured according to relevant test technical regulations. Finally, the mechanical properties of the specimens were compared, and the results show that the compressive, flexural, and tensile strengths of PPMFRC were increased by approximately 3%, 30%, and 20%, respectively, for mixtures with polypropylene macrofibers. The fracture toughness of PPMFRC was between 0.26 and 0.35, and the fracture energy was between 382.7 N/m and 485.6 N/m, which is significantly higher than that of plain concrete. The test results show that PPMFRC is an ideal material for the lining structure of a mine shaft under complex geological conditions, and we have provided technical parameters for engineering applications.

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32

Gutman, E., L. Utevski, M. Scheinker, A. Kozlovsky, and G. H. Michler. "Mechanical properties of flame-retardant polypropylene compositions." Journal of Macromolecular Science, Part B 38, no. 5-6 (September 1999): 1081–93. http://dx.doi.org/10.1080/00222349908248161.

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33

Kumar, Raj, J. S. Dhaliwal, G. S. Kapur, and Shashikant. "Mechanical properties of modified biofiller-polypropylene composites." Polymer Composites 35, no. 4 (October 17, 2013): 708–14. http://dx.doi.org/10.1002/pc.22714.

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34

Gregor-Svetec, Diana, and Franci Sluga. "High modulus polypropylene fibers. I. Mechanical properties." Journal of Applied Polymer Science 98, no. 1 (2005): 1–8. http://dx.doi.org/10.1002/app.21990.

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35

Incarnato, Loredana, Paola Scarfato, and Domenico Acierno. "Rheological and mechanical properties of recycled polypropylene." Polymer Engineering & Science 39, no. 4 (April 1999): 749–55. http://dx.doi.org/10.1002/pen.11463.

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36

Hong, C. K., I. Hwang, N. Kim, D. H. Park, B. S. Hwang, and C. Nah. "Mechanical properties of silanized jute–polypropylene composites." Journal of Industrial and Engineering Chemistry 14, no. 1 (January 2008): 71–76. http://dx.doi.org/10.1016/j.jiec.2007.07.002.

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37

Li, Xue Ying, Jing Zhao, Wei Zhe Wang, and Alan Jiang. "Effects of Polypropylene Fiber on Plastic Shrinkage Crack and Mechanical Properties of Concrete." Key Engineering Materials 324-325 (November 2006): 487–90. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.487.

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This paper reports on the mechanical properties and plastic shrinkage crack of concrete containing modified polypropylene fibera kind of new porous polypropylene fiber. Results of crack properties tests show that after adding modified polypropylene fiber, crack area, maximum crack width and average crack width of concrete decreased markedly. Results of mechanical properties show that flexural and splitting tensile strength of concrete with 1.0‰ modified polypropylene fiber volume fraction at 28 days increased 24% and 28% respectively compared to the reference concrete; Reticulate polypropylene fiber has less effects than modified polypropylene fiber on flexural and splitting tensile strength. Compressive strength of fiber reinforced concrete changed slightly, but flexural strength and splitting tensile strength increased, and the ratio of splitting tensile strength to compressive strength decreased.

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38

Gabriel, Djoko Sihono, and Afifah Nadia Tiana. "Mechanical Properties Improvement of Recycled Polypropylene with Material Value Conservation Schemes Using Virgin Plastic Blends." Materials Science Forum 1015 (November 2020): 76–81. http://dx.doi.org/10.4028/www.scientific.net/msf.1015.76.

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Plastic packaging that applied material value conservation paradigm will generate good quality plastic waste. It can be recycled to produce raw material for new packaging. However, repetitive recycling has impacts on lowering its mechanical properties. Recycled plastic is expected not to undergo mechanical properties degradation. This research proposed to blend recycled plastic pellets with its virgin plastic to reduce mechanical properties degradation. Mechanical properties of recycled polypropylene are compared to 100% virgin polypropylene and recycled/virgin polypropylene blends with composition 90/10, 70/30, 50/50, 30/70, and 10/90. Mechanical properties tested in this research are modulus of elasticity, tensile strength, elongation at break, and density. All were tested according to ASTM for mechanical properties testing materials. This study revealed blending 50% virgin polypropylene significantly improves mechanical properties of recycled plastics and keep improving at 70% virgin polypropylene. The optimum improvement based on four mechanical properties was found at composition 30/70 of recycled/virgin plastic. Elongation at break is the most critical property where degradation was found at 90/10. Blending 6th recycled and virgin polypropylene gives opportunities to improve the mechanical properties of recycled plastic products with careful consideration of the compositions. By implementing material value conservation, good quality plastic waste can be recycled repetitively. This will decrease accumulation of plastic waste generation and usage of non-renewable plastic’s raw material. The positive impact is not only to economic of plastic industry but also to the quality of environment.

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39

Dibaei, Asl, Majid Abdouss, Angaji Torabi, and Aminoddin Haji. "Surface and mechanical properties of polypropylene/clay nanocomposite." Chemical Industry and Chemical Engineering Quarterly 19, no. 3 (2013): 441–48. http://dx.doi.org/10.2298/ciceq120226079d.

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Huge consumption of polypropylene in the industries like automotive motivates academic and industrial R&Ds to find new and excellent approaches to improve the mechanical properties of this polymer, which has no degradation effect on other required performance properties like impact resistance, controlled crystallinity, toughness and shrinkage. Nowadays, nanoparticles play a key role in improving the mechanical and surface properties of polypropylene. In this study, three compositions of "Polypropylene/nanoclay", containing 0%, 2% and 5% of nanoclay were prepared in internal mixer. For characterizing the nanoclay dispersion in polymer bulk, TEM and XRD tests were used. For scratch resistance test, scratch lines were created on the load of 900 grain on sheets and SEM images were taken and compared with neat PP scratch image. Crystallinity and mechanical behavior were studied. The results showed that mechanical properties and scratch resistance of the composites have been improved.

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40

Nazir, Sheikh Gowhar, and Mr Misbah Danish. "To Determine the Mechanical Properties of Concrete by Using Glass Fibre and Polypropylene Fibre." International Journal of Trend in Scientific Research and Development Volume-2, Issue-5 (August 31, 2018): 1521–33. http://dx.doi.org/10.31142/ijtsrd17019.

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41

Ouyang, Dong, Lin Jie Kong, Hao Fu, Liu Li Lu, Long Liao, and Chen Wu Huang. "Experimental Investigations on Mechanical Properties and Fire Resistance of Steel-Polypropylene Hybrid Fiber Reinforced Concrete." Advanced Materials Research 772 (September 2013): 182–87. http://dx.doi.org/10.4028/www.scientific.net/amr.772.182.

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This paper investigates the mechanical properties and the fire resistance of steel-polypropylene hybrid fiber-reinforced concrete. The type of the polypropylene fibers are polypropylene monofilament fiber, polypropylene fibrillated fiber, and macro polypropylene fiber, and the type of the steel fibers is hooked steel fiber. The experimental results show that the compressive strength, splitting tensile strength and flexural properties of steel-macro polypropylene hybrid fiber reinforced concrete are better than any others. And the fire resistance of steel-monofilament polypropylene hybrid fiber reinforced concrete is the best.

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42

Szczygielska, Agnieszka, and Jacek Kijeński. "Studies of properties of polypropylene/halloysite composites." Polish Journal of Chemical Technology 13, no. 3 (January 1, 2011): 61–65. http://dx.doi.org/10.2478/v10026-011-0039-0.

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Studies of properties of polypropylene/halloysite compositesThe results of the studies on the synthesis, mechanical and thermal properties of polypropylene composites with various amount of halloysite filler are presented. Halloysite (HNT) belongs to the silica type characterized by a two-layer 1:1 structure. This work was aimed to develop a method for the modification of halloysite in its prime use as a filler for polypropylene by extrusion. The composites contain 1, 3, 5 and 7 wt.% of HNT. The degree of crystallinity of the composites decrease with increasing halloysite content. The results confirm the expectations that composites of interesting physicochemical, mechanical and thermal properties can be obtained. The mechanical properties studied show that the filler modification method used leads to the synthesis of polymer composites of improved thermal and mechanical properties.

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43

Zhu, Ye Ran, Jun Cai, Dong Wang, and Guo Hong Huang. "The Effect of Polypropylene Fiber on the Mechanical Properties of Self-Compacting Concrete." Advanced Materials Research 168-170 (December 2010): 1325–29. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1325.

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This paper investigates the mechanical properties (compressive strength, splitting tensile strength and flexural toughness) of polypropylene fiber reinforced self-compacting concrete (PFRSCC). The effect of the incorporation of polypropylene fiber on the mechanical properties of PFRSCC is determined. Four point bending tests on beam specimens were performed to evaluate the flexural properties of PFRSCC. Test results indicate that flexural toughness and ductility are remarkably improved by the addition of polypropylene fiber.

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44

Yousef, N. S. "Statistical Study on Additives Used to Improve Mechanical Properties of Polypropylene." Polymers 14, no. 1 (January 3, 2022): 179. http://dx.doi.org/10.3390/polym14010179.

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Polypropylene (PP) is a semi-crystalline polymer that is brittle under severe conditions. To meet industry needs, and to increase the applications of polypropylene, its mechanical properties should be improved. In this research, the mechanical properties of polypropylene, such as tensile strength at break, tensile strength at yield, % elongation, and Young’s modulus, were improved using two types of additives. Additives used were calcium carbonate master batch filler composed of 80% calcium carbonate and 20% polyethylene, and a mixture of linear low-density polyethylene (LLDPE)/low density polyethylene (LDPE). Results showed that both tensile strength at break, and tensile strength at yield, decrease with increasing the amount of both additives. Percentage elongation of PP increased using both additives. The modulus of elasticity of PP increases by increasing the amount of both additives, until a value of 20 wt%. Analysis of variance (ANOVA test) or (F-test) shows significant differences between the effect of different weights of LLDPE/LDPE mixture and calcium carbonate filler on the four mechanical properties of polypropylene studied at a level of 0.05. T-tests are applied to compare between the effect of both calcium carbonate master batch filler and the mixture LLDPE/LDPE on the four mechanical properties of polypropylene studied. T-tests show no significant differences between the effect of both calcium carbonate master batch filler and the mixture LLDPE/LDPE on all mechanical properties of polypropylene studied at a level of 0.05.

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Bassyouni, M. "Dynamic mechanical properties and characterization of chemically treated sisal fiber-reinforced polypropylene biocomposites." Journal of Reinforced Plastics and Composites 37, no. 23 (September 7, 2018): 1402–17. http://dx.doi.org/10.1177/0731684418798049.

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The incorporation of sisal fiber as reinforcement materials for polymers will be advantageous if it is synthesized and manufactured perfectly. In this study, surface modification using polymeric diphenylmethane di-isocyanate and gamma-aminopropyltriethoxysilane was applied for further amelioration of polypropylene–sisal bonding. Surface morphology, thermomechanical properties, thermal stability, and chemical bonding were investigated using scanning electron microscopy, dynamic mechanical analysis, thermogravimetric analysis, and Fourier transform infrared spectroscopy, respectively. A number of mathematical models were studied for predicting the effect of untreated and modified sisal fiber loadings on the mechanical properties of biocomposites. Polymeric diphenylmethane di-isocyanate showed a significant improvement on the thermal and mechanical properties of polypropylene biocomposites. Fourier transform infrared spectroscopy analysis of polypropylene–sisal biocomposite showed the formation of urethane group at 3333 cm−1 in the presence of polymeric diphenylmethane di-isocyanate. Glass transition temperature of polypropylene–sisal was slightly increased to 6.8°C by chemical modification with polymeric diphenylmethane di-isocyanate. Yield strength of polypropylene–sisal (30 wt%) was enhanced by more than 50% with polymeric diphenylmethane di-isocyanate chemical treatment. Halpin–Tsai and Nielsen theoretical mathematical models showed a good agreement with experimental results of polypropylene–untreated sisal and polypropylene–treated sisal, respectively.

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Li, Rui, Lei Liu, Huaming An, and Ya Wang. "Study on Dynamic Constitutive Model of Polypropylene Concrete under Real-Time High-Temperature Conditions." Applied Sciences 12, no. 3 (January 29, 2022): 1482. http://dx.doi.org/10.3390/app12031482.

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Polypropylene (PP) concrete, a kind of high-performance fiber-reinforced concrete, is widely used in large concrete structures. Studies on the dynamic mechanical properties of polypropylene concrete under temperature–impact load can provide a theoretical basis for research on the structural stability of concrete structures during fires, explosions, and other disasters. The purpose of this paper was to study the dynamic mechanical properties of polypropylene concrete under real-time high-temperature conditions and to establish a dynamic damage constitutive model for polypropylene concrete under real-time high-temperature conditions. In this paper, Split Hopkinson Pressure Bar (SHPB) equipment was used to test the dynamic mechanical properties of polypropylene concrete with different high strain rates under different real-time high temperatures (room temperature, 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, and 800 °C). A modified “Z-W-T” model was used to determine the recursion of the dynamic damage constitutive model of polypropylene concrete under different temperature–impact loads, and the model was compared with the experimental data. The results show that the thermal conditions influenced the chemical composition and microstructure of the polypropylene fiber concrete, which was why the high temperatures had a strong influence on the dynamic mechanical properties of polypropylene concrete. When the heating temperature exceeded 300 °C, although the polypropylene concrete specimen was still able to maintain a certain strength, the dynamic mechanical properties showed a deterioration trend as the temperature increased. The comparation between the experimental data and the fitting curve of the dynamic damage constitutive model showed that the dynamic stress–strain curves could be well matched with the fitting curves of the dynamic damage constitutive model, meaning that this model could describe the dynamic mechanical properties of polypropylene concrete under different real-time high temperatures well.

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Mezher, Thaer Matlab, Ashraf A. M. R. Hiswa, and Mustafa Salman Shubber. "Improvement of Mechanical Properties of Concrete by Using Polyproplene Fibers and Admixure." Defect and Diffusion Forum 398 (January 2020): 167–72. http://dx.doi.org/10.4028/www.scientific.net/ddf.398.167.

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Concrete is considered a low tensile resistance material and a weak material against cracking. The weak properties of concrete has been enhanced by utilizing fibers to reinforce it. In this research, the effects of the polypropylene fibers on several properties of plain concrete have been studied. It was found that the polypropylene fibers has enhanced the concrete ductility and the concrete crack control. The compressive strength of plain concrete has been increased by adding polypropylene fibers to it and also the flexural and splitting strengths. The best results were at fibers ratio of 1%. When the polypropylene fibers ratio has changed different effects on concrete properties have been obtained.

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Demori, Renan, Eveline Bischoff, Ana P. de Azeredo, Susana A. Liberman, Joao Maia, and Raquel S. Mauler. "Morphological, thermo-mechanical, and thermal conductivity properties of halloysite nanotube-filled polypropylene nanocomposite foam." Journal of Cellular Plastics 54, no. 2 (December 5, 2016): 217–33. http://dx.doi.org/10.1177/0021955x16681449.

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Studies about polypropylene nanocomposite foams are receiving attention because nanoparticles can change physical and mechanical properties, as well as improve foaming behavior in terms of homogeneous cell structure, cell density, and void fraction. In this research, the foaming behavior of polypropylene, polypropylene/long-chain branched polypropylene (LCBPP) 100/20 blend, and polypropylene/LCBPP/halloysite nanocomposites with 0.5 and 3 parts per hundred of resin (phr) is studied. The LCBPP was used to improve the rheological properties of polypropylene/LCBPP blend, namely the degree of strain-hardening. Transmission electron microscopy observation indicated that halloysite nanotube particles are well distributed in the matrix by aggregates. Subsequent foaming experiments were conducted using chemical blowing agent in injection-molding processing. Polypropylene foam exhibited high cell density and cell size as well as a collapsing effect, whereas the polypropylene/LCBPP blend showed a reduction of the void fraction and cell density compared to expanded polypropylene. Also, the blend showed reduction of the collapsing effect and increase of homogeneous cell size distribution. The introduction of a small amount of halloysite nanotube in the polypropylene/LCBPP blend improved the foaming behavior of the polypropylene, with a uniform cell structure distribution in the resultant foams. In addition, the cell density of the composite sample was higher than the polypropylene/LCBPP sample, having increased 82% and 136% for 0.5 and 3 phr of loaded halloysite nanotube, respectively. Furthermore, the presence of halloysite nanotube increased crystallization temperature (Tc) and slightly increased dynamic-mechanical properties measured by dynamic-mechanical thermal analysis. By increasing halloysite nanotube content to 3 phr, the insulating effect increased by 13% compared to polypropylene/LCBPP blend. For comparative purposes, the effect on foaming behavior of polypropylene/LCBPP was also investigated using talc microparticles.

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Alsadey, Salahaldein. "Effect of Polypropylene Fiber Reinforced on Properties of Concrete." Journal of Advance Research in Mechanical & Civil Engineering (ISSN: 2208-2379) 3, no. 4 (April 30, 2016): 18–22. http://dx.doi.org/10.53555/nnmce.v3i4.318.

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This paper investigates on analyzing the effects of use of Polypropylene fiber in the mechanical properties of concrete. One ofthe main tasks of the construction industry is to increase the strength and reliability of structures while reducing construction costs. Effective use of fiber reinforced concrete is likely to lead to reduction in reinforcement. Three mixes used polypropylene fiber with content 1.0%, 1.5%, and 2.0% percent. To provide a basis for comparison, reference specimens were cast without polypropylene fiber. The test results showed that the increase of mechanical properties (compressive strength) resulting from added of polypropylene fiber was relatively high.

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Mihelčič, Mohor, Alen Oseli, Miroslav Huskić, and Lidija Slemenik Perše. "Influence of Stabilization Additive on Rheological, Thermal and Mechanical Properties of Recycled Polypropylene." Polymers 14, no. 24 (December 12, 2022): 5438. http://dx.doi.org/10.3390/polym14245438.

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To decrease the amount of plastic waste, the use of recycling techniques become a necessity. However, numerous recycling cycles result in the mechanical, thermal, and chemical degradation of the polymer, which leads to an inefficient use of recycled polymers for the production of plastic products. In this study, the effects of recycling and the improvement of polymer performance with the incorporation of an additive into recycled polypropylene was studied by spectroscopic, rheological, optical, and mechanical characterization techniques. The results showed that after 20 recycling steps of mechanical processing of polypropylene, the main degradation processes of polypropylene are chain scission of polymer chains and oxidation, which can be improved by the addition of a stabilizing additive. It was shown that a small amount of an additive significantly improves the properties of the recycled polypropylene up to the 20th reprocessing cycle. The use of an additive improves the rheological properties of the recycled melt, surface properties, and time-dependent mechanical properties of solid polypropylene since it was shown that the additive acts as a hardener and additionally crosslinks the recycled polymer chains.

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