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Multifunctional shape memory polymers based on adaptive covalent networks
Published on Dec 03, 2018299 Views
Shape-memory polymers (SMPs) are remarkable materials able to switch from a temporary shape to their initial permanent shape by crossing a thermal transition, e.g. melting transition. Efficient shap
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Multifunctional shape memory polymers based on covalent adaptive networks00:00
University of Liege, Belgium00:58
Shape-memory polymers (SMP)02:22
Thermo-responsive shape-memory polymers - 103:53
Thermo-responsive shape-memory polymers - 205:28
Thermo-responsive shape-memory polymers - 305:58
Thermo-responsive shape-memory polymers - 406:01
Thermo-responsive shape-memory polymers - 506:40
Thermo-responsive shape-memory polymers - 606:52
Thermo-responsive shape-memory polymers - 707:25
Covalently cross-linked semi-crystalline networks (class II)07:47
Processing the permanent shape: melt-flow injection - 108:56
Processing the permanent shape: melt-flow injection - 209:24
Goal of the research: reversible covalent networks10:07
Covalent adaptable networks (CANs)11:02
Selected reversible bonds for this work12:33
Insertion of these bonds into PCL networks13:12
Thermally-controlled [4+2] cycloaddition (Diels-Alder reaction) - 114:33
Thermally-controlled [4+2] cycloaddition (Diels-Alder reaction) - 215:02
Thermally-controlled [4+2] cycloaddition (Diels-Alder reaction) - 315:13
Thermally-controlled [4+2] cycloaddition (Diels-Alder reaction) - 415:22
Functionalization of 4-arm star-shaped PCL - 115:26
Functionalization of 4-arm star-shaped PCL - 216:08
Functionalization of 4-arm star-shaped PCL - 316:41
Mixing of the precursors17:12
Crosslinking study by swelling experiments 17:27
Crosslinking study by rheology (TA Ares G2 : 1% deformation, 65°C)18:48
Crosslinking study by Raman spectroscopy - 120:47
Crosslinking study by Raman spectroscopy - 222:21
Crosslinking study by Raman spectroscopy - 322:47
Crosslinking study by Raman spectroscopy - 423:12
Shape-memory properties - 123:15
Shape-memory properties - 223:38
Shape-memory properties - 325:19
Shape-memory properties - 425:58
Shape-memory properties - 527:03
Shape-memory properties - 627:55
Shape-memory properties - 728:09
Shape-memory properties - 828:12
Study of the network thermoreversibility by rheology28:25
Recycling experiment30:11
Shape-memory properties before and after recycling - 130:36
Shape-memory properties before and after recycling - 231:06
What happens with a more stable Diels-Alder adduct ?32:14
Thermally-controlled [4+2] cycloaddition (Diels-Alder reaction) - 132:58
Thermally-controlled [4+2] cycloaddition (Diels-Alder reaction) - 233:15
Thermally-controlled [4+2] cycloaddition (Diels-Alder reaction) - 333:37
Thermally-controlled [4+2] cycloaddition (Diels-Alder reaction) - 433:48
Reversible TAD/Indole Alder-ene reaction33:54
1,2,4-triazoline-3,5-dione (TAD) - 134:55
1,2,4-triazoline-3,5-dione (TAD) - 235:07
1,2,4-triazoline-3,5-dione (TAD) - 335:48
General Strategy – TAD-Indole crosslinking 36:18
Functionalization of PCL by indole moieties - 137:13
Functionalization of PCL by indole moieties - 237:17
Functionalization of PCL by indole moieties - 337:23
Processing of the precursors37:34
Shape-memory properties - 138:23
Shape-memory properties - 238:46
Stress-relaxation experiment - 140:58
Shape-memory properties40:58
Stress-relaxation experiment - 242:26
Reprocessing experiment43:18
Photo-reversible coumarin dimerization44:34
General Strategy – coumarin dimerization45:18
Functionalization of PCL by coumarin moieties - 445:31
Functionalization of PCL by coumarin moieties - 545:39
Processing of the precursor - 145:42
Processing of the precursor - 245:54
Processing of the precursor - 346:05
Crosslinking study by swelling experiments46:41
Crosslinking study by rheology - 148:01
Crosslinking study by rheology - 248:09
Crosslinking study by Raman spectroscopy49:08
Determination of the crystallization temperature49:52
Shape-memory properties51:01
Adjustment of the mechanical properties by controlling the irradiation time51:32
Study of the dimerization/cleavage by Raman spectroscopy52:26
Reprocessing experiment54:21
Conclusions55:24
Applications of cross-linked polymers56:55
Acknowlegdments - 158:30
Acknowlegdments - 259:48
Thank you for your attention01:00:30