{"title":"RELAXATION BEHAVIOR OF 3D PRINTED NBR-BASED RUBBER O-RINGS AS INNER PART OF ROD SEALS","authors":"Lion Sundermann, B. Klie, Ulrich Giese","doi":"10.5254/rct-d-23-00036","DOIUrl":null,"url":null,"abstract":"\n The viscoelastic properties of rubber polymer-based compounds are crucial for further applications but challenging in the manufacturing process using additive manufacturing techniques. The fact that the first layer is attached to the printing bed restricts free relaxation after extrusion, that the part shows a strong contraction along the printing direction after release and especially after vulcanization. In this study, the molar mass distribution and acrylonitrile (ACN) content of an NBR-based compound for the fabrication of O-rings for rod seal applications was varied to demonstrate the different degree of contraction resulting from 3D printing. An ACN content of 34% and an average molar mass Mw of 2.47·105 g·mol−1 with a dispersity index D of 2.6 was found to be a suitable compromise between the degree of contraction and compression set as a criterion for the application as O-ring as inner part of rod seals.","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":" 680","pages":""},"PeriodicalIF":17.7000,"publicationDate":"2024-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.5254/rct-d-23-00036","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The viscoelastic properties of rubber polymer-based compounds are crucial for further applications but challenging in the manufacturing process using additive manufacturing techniques. The fact that the first layer is attached to the printing bed restricts free relaxation after extrusion, that the part shows a strong contraction along the printing direction after release and especially after vulcanization. In this study, the molar mass distribution and acrylonitrile (ACN) content of an NBR-based compound for the fabrication of O-rings for rod seal applications was varied to demonstrate the different degree of contraction resulting from 3D printing. An ACN content of 34% and an average molar mass Mw of 2.47·105 g·mol−1 with a dispersity index D of 2.6 was found to be a suitable compromise between the degree of contraction and compression set as a criterion for the application as O-ring as inner part of rod seals.
橡胶聚合物基化合物的粘弹性能对进一步的应用至关重要，但在使用增材制造技术的制造过程中却面临挑战。由于第一层附着在打印床上，因此挤压后的自由松弛受到限制，部件在脱模后，尤其是在硫化后会沿打印方向出现强烈收缩。在这项研究中，我们改变了一种用于制造棒状密封件 O 形环的 NBR 基化合物的摩尔质量分布和丙烯腈（ACN）含量，以证明 3D 打印会产生不同程度的收缩。结果发现，ACN 含量为 34%、平均摩尔质量 Mw 为 2.47-105 g-mol-1、分散指数 D 为 2.6 时，是作为棒状密封件内部 O 形圈应用标准的收缩和压缩程度之间的适当折衷。
期刊介绍：
Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance.
Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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