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Professors Timothy Long and Christopher Williams from Virginia Tech present us with an in depth look on how by combining forces they were able to produce new polymers and materials for 3D printing procedures.

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Chapters:
0:00 Intro
3:04 What is a Hokie?
3:46 Where is Virginia Tech?
4:09 Macromolecules Innovation Institute: A Virtual university-wide materials program
4:44 Only recently on our campus...
5:22 Since we will be talking about lithography(printing with light) and photochemistry
6:07 Additive Manufacturing
6:46 Additive Manufacturing vs Traditional Manufacturing
7:34 Lots of ways to make layers!
7:56 Today's Scope: Polymers
8:13 Webinar Outline
8:52 Vat Photopolymerization Process (Stereolithography)
10:07 Industrial Applications of Photopolymerization AM
11:53 Vat Photopolymerization: Mask Projection Stereolithography (MPSL)
13:09 Large-area Mask Projection Scanning Stereolithography
13:58 Bottom-Up MPSL
14:56 Material Jetting Photopolymers
15:28 Multi-Material Jetting
17:10 What is a photopolymer?
17:39 Vat Photopolymerization Materials: Acrylates & Epoxies
18:35 Commercial SL Resins
19:11 Traditional Stereolithography Resin Design
21:05 Challenge, Opportunity & Invitation
22:03 Webinar Outline: Material Discovery for Vat Photopolymerization
22:25 Vat Photopolymerization: Process Physics
23:38 Traditional Process Planning: Working Curve
24:48 VT MII: "Molecules to Manufacturing"
25:39 VT Innovation Process: Thermal, Rheological, and Mechanical Characterization Tools
30:00 Suggested Reviews
30:51 Webinar Outline: Novel Photopolymers for AM
31:50 Mask Projection Micro-stereolithography successfully 3D prints a phosphonium ionic liquid
33:15 Poly with 0.25 wt% Tinuvin increases print resolution, printability, and structural definition
34:24 Visualization below the surface of printed objects in virtual reality space
35:20 Biphasic Schotten-Baumann reaction conditions afford siloxane acrylamides (PDMS-AA)
37:00 A photocuring accessory offers rheological characterization of UV-curable polymers
37:48 Photorheology and soxhlet extraction probe gelation behavior
39:12 Photorheology demonstrates decreasing photocured plateau modulus with increasing PDMS molecular weight
40:19 Log G' vs log(1/M) follows unentangled rubber elasticity theory
40:56 A photocuring accessory offers calorimetric characterization of UV-Curable polymers
42:41 Photocalorimetry indicates increasing heat evolved with decreasing PDMS molecular weight
43:49 Optical microscopy reveals improved structural details for poly(PPG) with Tinuvin-400
44:45 Tinuvin-400 photo-absorber increases cure time for photo-crosslinking PPG
45:23 Thiol-ene click chemistry and pyrolysis provides dense ceramics with previously inaccessible geometries
46:13 Fischer esterification affords PDMS dithiol for further thiol-ene reactions
46:38 1:1 thiol-vinyl mixture demonstrates large initial viscosity increase and sufficient temporal control
47:44 Photorheology demonstrates comparable modulus for 0.75:1.0 thiol:acrylamide and PDMS30.6K-AA
48:21 Funcional siloxanes for MPµSL enable photo-activated, simultaneous chain extension and crosslinking
49:16 Photcured PDMS acrylamide displays decreasing plateau modulus with increasing MW
49:41 Thiol-acrylamide mixture possesses low viscosity and once photocured exhibits modulus of higher MW photocured acrylamides
50:36 3D Printed Testing Specimens
50:55 Preliminary tensile testing demonstrates 2x increase in strain at break for filled PDMS at 25 wt%
51:46 Webinar Outline: High-performance Engineering Thermoplastics: Polyimide
52:01 Most high-performance polymers are challenging to 3D print
52:38 High-performance thermoplastic polyimides
53:13 3D printing Kapton using mask-projection µSLA... a challenging proposition
54:01 Processing the unprocessable: 3D printing Kapton using mask-projection µSLA
54:38 Incorporating photocrosslinkable groups in dianhydrides
55:02 Soluble, photcrosslinkable precursor poly(amic esters) (PADE)
55:35 Strategy for 3D printing organogels using SLA
56:24 MPSL enables 3D organogel structures
56:43 Post-printing processing to obtain PMDA-ODA polyimide
57:27 53% isotropic shrinkage helps maintain structural integrity and part resolution
58:26 SEM analysis of cross-section reveals absence of layers and comparable properties to films
58:42 Measured properties of printed PMDA-ODA similar to Kapton film
59:08 Rethink the process and tools for discovery of future AM materials
1:01:20 Q&A