Pub Date : 2019-01-01DOI: 10.1021/BK-2019-1315.CH007
Masoumeh Pourali, Amy M. Peterson
{"title":"Thermal Modeling of Material Extrusion Additive Manufacturing","authors":"Masoumeh Pourali, Amy M. Peterson","doi":"10.1021/BK-2019-1315.CH007","DOIUrl":"https://doi.org/10.1021/BK-2019-1315.CH007","url":null,"abstract":"","PeriodicalId":7028,"journal":{"name":"ACS Symposium Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72663051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.1021/BK-2019-1315.CH006
C. McIlroy, J. Seppala, Anthony P. Kotula
Semicrystalline polymer melts are commonly used in material extrusion (MatEx) for 3D printing. Although flows have a profound effect on polymer crystallization, the relationship between typical MatEx deformation rates and printed-part crystal morphology is yet to be understood. Here, MatEx is used to print a wall of polylactic acid filaments. The linear rheology and quiescent crystallization kinetics are characterized, infrared imaging is used to measure temperature variations during the MatEx process, and optical microscopy is employed to determine the resulting crystal morphology before and after a postprinting thermal annealing process. Our flow-enhanced crystallization model demonstrates that MatEx-induced polymer stretch leads to a higher nucleation density and greater space filling in the weld regions between deposited filaments. Consequently, after annealing, the weld regions feature smaller spherulites than the filament center, as shown by optical microscopy. Finally, flow-induced crystallization is proposed as a method to improve weld toughness.
{"title":"Combining Modeling and Measurements To Predict Crystal Morphology in Material Extrusion","authors":"C. McIlroy, J. Seppala, Anthony P. Kotula","doi":"10.1021/BK-2019-1315.CH006","DOIUrl":"https://doi.org/10.1021/BK-2019-1315.CH006","url":null,"abstract":"Semicrystalline polymer melts are commonly used in material extrusion (MatEx) for 3D printing. Although flows have a profound effect on polymer crystallization, the relationship between typical MatEx deformation rates and printed-part crystal morphology is yet to be understood. Here, MatEx is used to print a wall of polylactic acid filaments. The linear rheology and quiescent crystallization kinetics are characterized, infrared imaging is used to measure temperature variations during the MatEx process, and optical microscopy is employed to determine the resulting crystal morphology before and after a postprinting thermal annealing process. Our flow-enhanced crystallization model demonstrates that MatEx-induced polymer stretch leads to a higher nucleation density and greater space filling in the weld regions between deposited filaments. Consequently, after annealing, the weld regions feature smaller spherulites than the filament center, as shown by optical microscopy. Finally, flow-induced crystallization is proposed as a method to improve weld toughness.","PeriodicalId":7028,"journal":{"name":"ACS Symposium Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74932854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.1021/BK-2019-1335.CH005
Sarah B. Boesdorfer
{"title":"Advancing Professional Knowledge and Skills for Chemistry Teaching through an Online Master’s Degree for Secondary-Level Chemistry Teachers","authors":"Sarah B. Boesdorfer","doi":"10.1021/BK-2019-1335.CH005","DOIUrl":"https://doi.org/10.1021/BK-2019-1335.CH005","url":null,"abstract":"","PeriodicalId":7028,"journal":{"name":"ACS Symposium Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75123261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.1021/BK-2019-1312.CH012
S. Singleton
{"title":"Computational Narrative Activities: Combining Computing, Context, and Communication To Teach Chemical Concepts","authors":"S. Singleton","doi":"10.1021/BK-2019-1312.CH012","DOIUrl":"https://doi.org/10.1021/BK-2019-1312.CH012","url":null,"abstract":"","PeriodicalId":7028,"journal":{"name":"ACS Symposium Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77485994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.1021/bk-2019-1309.ch012
L. Vong, Y. Nagasaki
{"title":"Redox Polyion Complex Micelle-Based Injectable Hydrogel as Local Reactive Oxygen Species Scavenging Therapeutics","authors":"L. Vong, Y. Nagasaki","doi":"10.1021/bk-2019-1309.ch012","DOIUrl":"https://doi.org/10.1021/bk-2019-1309.ch012","url":null,"abstract":"","PeriodicalId":7028,"journal":{"name":"ACS Symposium Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80256846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.1021/bk-2019-1336.ch002
Mary S. Lenczewski
{"title":"Using Just-in-Time Teaching To Engage Rural Students in Small Enrollment Organic Chemistry Classes","authors":"Mary S. Lenczewski","doi":"10.1021/bk-2019-1336.ch002","DOIUrl":"https://doi.org/10.1021/bk-2019-1336.ch002","url":null,"abstract":"","PeriodicalId":7028,"journal":{"name":"ACS Symposium Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85489319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.1021/BK-2019-1319.CH002
Nicole Centazzo, M. Concheiro-Guisan
{"title":"Analytical Techniques for the Identification and Quantification of Drugs and Metabolites in Wastewater Samples","authors":"Nicole Centazzo, M. Concheiro-Guisan","doi":"10.1021/BK-2019-1319.CH002","DOIUrl":"https://doi.org/10.1021/BK-2019-1319.CH002","url":null,"abstract":"","PeriodicalId":7028,"journal":{"name":"ACS Symposium Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76816491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.1021/bk-2019-1324.ch010
Sarah E. C. Gray
{"title":"From DUIs to Stolen Treasure: Using Real-World Sample Analysis To Increase Engagement and Critical Thinking in Analytical Chemistry Courses","authors":"Sarah E. C. Gray","doi":"10.1021/bk-2019-1324.ch010","DOIUrl":"https://doi.org/10.1021/bk-2019-1324.ch010","url":null,"abstract":"","PeriodicalId":7028,"journal":{"name":"ACS Symposium Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80933245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.1021/bk-2019-1321.ch005
Johannes Kiefl, Sandra Boerding, Birgit Kohlenberg, Michael Backes, Petra Slabizki, Smita Raithore, G. Krammer
{"title":"Thermal Decomposition of Wood-Derived Organic Matter under Specific Industrial Process Conditions","authors":"Johannes Kiefl, Sandra Boerding, Birgit Kohlenberg, Michael Backes, Petra Slabizki, Smita Raithore, G. Krammer","doi":"10.1021/bk-2019-1321.ch005","DOIUrl":"https://doi.org/10.1021/bk-2019-1321.ch005","url":null,"abstract":"","PeriodicalId":7028,"journal":{"name":"ACS Symposium Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83597897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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