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The field of stimuli-sensitive polymers has grown rapidly over the past decade. Actively-moving polymers have gained attention and have been proposed for use in applications from shape-changing biomedical devices to morphing structures. This webinar covers the basics of characterizing shape-memory polymers using thermo-mechanical equipment, such as the Q800 and ElectroForce 3200, with assistant professor Christopher Yakacki.

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Chapters:
0:00 Intro
2:22 Overview
2:42 Stimuli Sensitive Polymers
3:11 Stimuli Synthetic Polymers
3:39 Potential Biomedical Devices
5:54 Shape-Memory Polymers (SMPs)
6:46 The Shape-Memory Cycle
8:04 Why Heat for Programming?
9:10 Why do we cool for Storage?
9:46 Why does Recovery Occur? Let's first look at Entropy
10:22 Why does Recovery Occur? What happens when we stretch a polymer?
11:18 Questions We Want Answered
12:32 Machines I Use
12:46 Thermal Mechanical Analysis
14:25 Dynamic Mechanical Analysis
15:54 DMA Measurables
17:20 What do these mean?
18:47 Application Highlight- ElectroForce
19:41 DMA-Measure Photo-crosslinking
20:21 DMTA - The Glass Transition
21:55 Different Types of SMPs
23:10 Appropriate Polymer Structure
24:05 Shape-Memory Characterization
28:00 Run Complete Shape-Memory Cycle
29:27 Study Results: Measurement of Crosslink Density
30:38 More Crosslinks... More Stress
31:25 Designing a Thermoplastic SMP
32:22 Poly(para-phenylene) aka. PPP
34:11 WLF Coefficients
37:15 Use TTS for Equivalent Conditions
40:09 Techniques Apply to Other Systems
41:38 Reversible Actuation
41:57 Measure Work Capacity
42:55 Conclusions
43:24 Acknowledgements
44:01 Q&A

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