THE DESIGN OF A MULTIFUNCTIONAL INITIATOR-FREE SOFT POLYESTER PLATFORM FOR ROOM-TEMPERATURE EXTRUSION-BASED 3D PRINTING, AND ANALYSIS OF PRINTABILITY
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| Language: | English |
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University of Akron / OhioLINK
2016
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=akron1466778249 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-akron14667782492021-08-03T06:37:06Z THE DESIGN OF A MULTIFUNCTIONAL INITIATOR-FREE SOFT POLYESTER PLATFORM FOR ROOM-TEMPERATURE EXTRUSION-BASED 3D PRINTING, AND ANALYSIS OF PRINTABILITY Govindarajan, Sudhanva Raj Polymers Polymer Chemistry Physics Engineering Materials Science 3D Printing Biomaterials Polyesters Patterning Polymers Extrusion Extrusion Based Printing Unentangled Melts Rouse Regime Extrusion Rheology of Inks 3D Printing Rheology Printability A 3D printable functionalized polyester platform was developed using a coumarin pendant group as a photo-crosslinker. The coumarin pendant groups convert the copolyester from a viscous liquid to an elastomeric solid under 365 nm UV light at room temperature without the use of an initiator. Relatively hydrophobic variants of this platform (SC) was created using unsaturated aliphatic chains derived from soybean oil as pendant groups. A hydrogel variant (CPP) of this platform was created by using polyethylene glycol (PEG) as a backbone. Cell studies of the SC copolyester showed no toxic effects over short time scales. Rheological analysis demonstrated that all polymers over a range of molar feed ratios and molar masses were shear thinning. The SC platform has a very high entanglement molecular weight and has rheological behavior similar to that of an un-entangled brush. UV crosslinking of both SC and CPP platforms create thermosetting elastomeric solids. The relatively SC platform exhibits a high degree of fully reversible elastic deformation under shear due to chain extensibility and lack of trapped entanglements. Multiple pendant functional groups can be readily incorporated into this platform. Primary amine functionality was incorporated into the SC copolyester as a proof of concept. Extrusion based 3D printing (EBP) was successfully demonstrated on both platforms and FITC was successfully covalently clicked onto the primary amine functional group post-printing. Extrusion of the SC platform was accelerated due to UV extrusion. This might be due to Rouse-like behavior under shear coupled with excitation of cis double bonds in the unsaturated pendant groups. Examination of defects accumulated during the 3D printing process demonstrated that dynamic viscoelasticity due to print speed V affected the overall quality of the print. Interfacial chain relaxation institutes a lag-time between initial deposition and adhesion which increases with V. Deformability of the polymer substrate due to shear during deposition can negatively impact adhesion during this lag time, forming a defect. This phenomenon was modeled using two comprehensive equations. 2016-10-04 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1466778249 http://rave.ohiolink.edu/etdc/view?acc_num=akron1466778249 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Polymers Polymer Chemistry Physics Engineering Materials Science 3D Printing Biomaterials Polyesters Patterning Polymers Extrusion Extrusion Based Printing Unentangled Melts Rouse Regime Extrusion Rheology of Inks 3D Printing Rheology Printability |
| spellingShingle |
Polymers Polymer Chemistry Physics Engineering Materials Science 3D Printing Biomaterials Polyesters Patterning Polymers Extrusion Extrusion Based Printing Unentangled Melts Rouse Regime Extrusion Rheology of Inks 3D Printing Rheology Printability Govindarajan, Sudhanva Raj THE DESIGN OF A MULTIFUNCTIONAL INITIATOR-FREE SOFT POLYESTER PLATFORM FOR ROOM-TEMPERATURE EXTRUSION-BASED 3D PRINTING, AND ANALYSIS OF PRINTABILITY |
| author |
Govindarajan, Sudhanva Raj |
| author_facet |
Govindarajan, Sudhanva Raj |
| author_sort |
Govindarajan, Sudhanva Raj |
| title |
THE DESIGN OF A MULTIFUNCTIONAL INITIATOR-FREE SOFT POLYESTER PLATFORM FOR ROOM-TEMPERATURE EXTRUSION-BASED 3D PRINTING, AND ANALYSIS OF PRINTABILITY |
| title_short |
THE DESIGN OF A MULTIFUNCTIONAL INITIATOR-FREE SOFT POLYESTER PLATFORM FOR ROOM-TEMPERATURE EXTRUSION-BASED 3D PRINTING, AND ANALYSIS OF PRINTABILITY |
| title_full |
THE DESIGN OF A MULTIFUNCTIONAL INITIATOR-FREE SOFT POLYESTER PLATFORM FOR ROOM-TEMPERATURE EXTRUSION-BASED 3D PRINTING, AND ANALYSIS OF PRINTABILITY |
| title_fullStr |
THE DESIGN OF A MULTIFUNCTIONAL INITIATOR-FREE SOFT POLYESTER PLATFORM FOR ROOM-TEMPERATURE EXTRUSION-BASED 3D PRINTING, AND ANALYSIS OF PRINTABILITY |
| title_full_unstemmed |
THE DESIGN OF A MULTIFUNCTIONAL INITIATOR-FREE SOFT POLYESTER PLATFORM FOR ROOM-TEMPERATURE EXTRUSION-BASED 3D PRINTING, AND ANALYSIS OF PRINTABILITY |
| title_sort |
design of a multifunctional initiator-free soft polyester platform for room-temperature extrusion-based 3d printing, and analysis of printability |
| publisher |
University of Akron / OhioLINK |
| publishDate |
2016 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=akron1466778249 |
| work_keys_str_mv |
AT govindarajansudhanvaraj thedesignofamultifunctionalinitiatorfreesoftpolyesterplatformforroomtemperatureextrusionbased3dprintingandanalysisofprintability AT govindarajansudhanvaraj designofamultifunctionalinitiatorfreesoftpolyesterplatformforroomtemperatureextrusionbased3dprintingandanalysisofprintability |
| _version_ |
1719440002417426432 |