Mengna Luo, Mingjin Liu, Zheng Yan, Tao Wang, Yabing Qian, Jie Zhang
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In this work, disentangled LCB-PP was successfully prepared using the self-designed polymer melt disentanglement device that can apply a complex shear field (a superposition of rotational shear and oscillatory shear) to polymers. The effect of the rotational shear, oscillatory shear, and complex shear on disentanglement was studied. The results show that the complex shear field has a better effect on the disentanglement of LCB-PP, which is endowed with lower viscosity and higher melt flow rate compared to rotational shear and oscillatory shear. In secondary processing, the processing temperature and injection pressure required for disentangled LCB-PP are significantly reduced while mechanical properties are maintained.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":645,"journal":{"name":"Journal of Materials Science","volume":"59 43","pages":"20462 - 20479"},"PeriodicalIF":3.5000,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The influence of entanglement degree controlled by complex shear field on the performance of long-chain branched polypropylene\",\"authors\":\"Mengna Luo, Mingjin Liu, Zheng Yan, Tao Wang, Yabing Qian, Jie Zhang\",\"doi\":\"10.1007/s10853-024-10374-4\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The entanglement of polymers can cause a sharp increase in the viscosity of polymer melt, which is adverse to polymer processing. Disentanglement is an effective method to improve the processing performance of polymers without sacrificing mechanical properties. Although there are some methods to reduce the entanglement degree of polymers, few methods can preserve the disentangled state in pellets for secondary processing. Long-chain branched polypropylene (LCB-PP) has a slower entanglement recovery rate due to its branched chain. Thus, it is worth studying whether the disentangled state of LCB-PP can be kept in pellets to improve processing performance during secondary processing. In this work, disentangled LCB-PP was successfully prepared using the self-designed polymer melt disentanglement device that can apply a complex shear field (a superposition of rotational shear and oscillatory shear) to polymers. The effect of the rotational shear, oscillatory shear, and complex shear on disentanglement was studied. The results show that the complex shear field has a better effect on the disentanglement of LCB-PP, which is endowed with lower viscosity and higher melt flow rate compared to rotational shear and oscillatory shear. In secondary processing, the processing temperature and injection pressure required for disentangled LCB-PP are significantly reduced while mechanical properties are maintained.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>\",\"PeriodicalId\":645,\"journal\":{\"name\":\"Journal of Materials Science\",\"volume\":\"59 43\",\"pages\":\"20462 - 20479\"},\"PeriodicalIF\":3.5000,\"publicationDate\":\"2024-11-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Materials Science\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s10853-024-10374-4\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Science","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s10853-024-10374-4","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
The influence of entanglement degree controlled by complex shear field on the performance of long-chain branched polypropylene
The entanglement of polymers can cause a sharp increase in the viscosity of polymer melt, which is adverse to polymer processing. Disentanglement is an effective method to improve the processing performance of polymers without sacrificing mechanical properties. Although there are some methods to reduce the entanglement degree of polymers, few methods can preserve the disentangled state in pellets for secondary processing. Long-chain branched polypropylene (LCB-PP) has a slower entanglement recovery rate due to its branched chain. Thus, it is worth studying whether the disentangled state of LCB-PP can be kept in pellets to improve processing performance during secondary processing. In this work, disentangled LCB-PP was successfully prepared using the self-designed polymer melt disentanglement device that can apply a complex shear field (a superposition of rotational shear and oscillatory shear) to polymers. The effect of the rotational shear, oscillatory shear, and complex shear on disentanglement was studied. The results show that the complex shear field has a better effect on the disentanglement of LCB-PP, which is endowed with lower viscosity and higher melt flow rate compared to rotational shear and oscillatory shear. In secondary processing, the processing temperature and injection pressure required for disentangled LCB-PP are significantly reduced while mechanical properties are maintained.
期刊介绍：
The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.
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