A. V. Lobanov, A. A. Alekseev, E. A. Korobko, V. S. Osipchik, T. P. Kravchenko, N. G. David’yants, A. A. Alekseev Jr.
{"title":"Effect of Repeated Injection Molding Recycling of Polypropylene on Its Properties","authors":"A. V. Lobanov, A. A. Alekseev, E. A. Korobko, V. S. Osipchik, T. P. Kravchenko, N. G. David’yants, A. A. Alekseev Jr.","doi":"10.1134/S1995421226700450","DOIUrl":null,"url":null,"abstract":"<p>The effect of five-fold injection molding on the properties of polypropylene grades PP H030 GP (230°C) and PPG 1350-21 (190°C) has been studied. For PP H030 GP, an increase in the melt flow index by 33% has been established, along with stability of strength indicators under tension, bending, and shrinkage; elongation increases, but decreases after the 5th recycling cycle. The Charpy unnotched impact strength at ‒20°C monotonically decreases by 28%. The properties of PPG 1350-21 are stable under five-fold recycling conditions. Heat treatment of all samples at 120°C for 1 h has a significant effect on their properties: the “neck” disappears, strength increases and elongation at break decreases, leveling both the effect of the polypropylene grade and the number of recycling cycles.</p>","PeriodicalId":741,"journal":{"name":"Polymer Science, Series D","volume":"19 1","pages":"202 - 206"},"PeriodicalIF":0.5800,"publicationDate":"2026-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Polymer Science, Series D","FirstCategoryId":"1","ListUrlMain":"https://link.springer.com/article/10.1134/S1995421226700450","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Materials Science","Score":null,"Total":0}
引用次数: 0
Abstract
The effect of five-fold injection molding on the properties of polypropylene grades PP H030 GP (230°C) and PPG 1350-21 (190°C) has been studied. For PP H030 GP, an increase in the melt flow index by 33% has been established, along with stability of strength indicators under tension, bending, and shrinkage; elongation increases, but decreases after the 5th recycling cycle. The Charpy unnotched impact strength at ‒20°C monotonically decreases by 28%. The properties of PPG 1350-21 are stable under five-fold recycling conditions. Heat treatment of all samples at 120°C for 1 h has a significant effect on their properties: the “neck” disappears, strength increases and elongation at break decreases, leveling both the effect of the polypropylene grade and the number of recycling cycles.
期刊介绍：
Polymer Science, Series D publishes useful description of engineering developments that are related to the preparation and application of glues, compounds, sealing materials, and binding agents, articles on the adhesion theory, prediction of the strength of adhesive joints, methods for the control of their properties, synthesis, and methods of structural modeling of glued joints and constructions, original articles with new scientific results, analytical reviews of the modern state in the field.
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