Coordination Bonds and Diels–Alder Bonds Dual Crosslinked Polymer Networks of Self‐healing Polyurethane

2019 ◽  
Vol 57 (22) ◽  
pp. 2228-2234 ◽  
Author(s):  
Changhong Lin ◽  
Dekun Sheng ◽  
Xiangdong Liu ◽  
Shaobin Xu ◽  
Fance Ji ◽  
...  
Keyword(s):  
Polymer Networks ◽  
Diels Alder ◽  
Self Healing ◽  
Crosslinked Polymer ◽  
Coordination Bonds

scholarly journals The Influence of the Furan and Maleimide Stoichiometry on the Thermoreversible Diels–Alder Network Polymerization

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2522
Author(s):  
Ali Safaei ◽  
Seppe Terryn ◽  
Bram Vanderborght ◽  
Guy Van Assche ◽  
Joost Brancart
Keyword(s):  
Transition Temperature ◽  
Functional Groups ◽  
Polymer Networks ◽  
Viscoelastic Behavior ◽  
Mechanical Analysis ◽  
Thermomechanical Properties ◽  
Diels Alder ◽  
Stoichiometric Ratio ◽  
Self Healing ◽  
Scanning Calorimetry

In recent work, the thermoreversible Diels–Alder reaction between furan and maleimide functional groups has been studied extensively in the context of self-healing elastomers and thermosets. To elaborate the influence of the stoichiometric ratio between the maleimide and furan reactive groups on the thermomechanical properties and viscoelastic behavior of formed reversible covalent polymer networks, a series of Diels–Alder-based networks with different stoichiometric ratios was synthesized. Differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and dynamic rheology measurements were performed on the reversible polymer networks, to relate the reversible network structure to the material properties and reactivity. Such knowledge allows the design and optimization of the thermomechanical behavior of the reversible networks for intended applications. Lowering the maleimide-to-furan ratio creates a deficit of maleimide functional groups, resulting in a decrease in the crosslink density of the system, and a consequent decrease in the glass transition temperature, Young’s modulus, and gel transition temperature. The excess of unreacted furan in the system results in faster reaction and healing kinetics and a shift of the reaction equilibrium.

scholarly journals Influence of the Glass Transition Temperature and the Density of Crosslinking Groups on the Reversibility of Diels-Alder Polymer Networks

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1189
Author(s):  
Merlina Thiessen ◽  
Volker Abetz
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Radical Polymerization ◽  
Polymer Networks ◽  
Alder Reaction ◽  
Diels Alder ◽  
Self Healing ◽  
Scanning Calorimetry ◽  
Diels Alder Reaction

The interest in self-healing, recyclable, and adaptable polymers is growing. This work addresses the reversibility of crosslink formation based on Diels-Alder reaction in copolymer networks containing furfuryl and maleimide groups, which represent the “diene” and the “dienophile,” respectively. The copolymers are synthesized by atom transfer radical polymerization (ATRP) and free radical polymerization. The diene bearing copolymers are crosslinked either with a small molecule containing two dienophiles or with a dienophile bearing copolymer. The influence of the crosslinking temperature on the Diels-Alder reaction is analyzed. Furthermore, the influence of the glass transition temperature and the influence of the density of crosslinking groups on the thermo-reversibility of crosslinking are investigated by temperature dependent infrared spectroscopy and differential scanning calorimetry. It is shown that the reversibility of crosslinking is strongly influenced by the glass transition temperature of the system.

scholarly journals Self-Healing in Mobility-Restricted Conditions Maintaining Mechanical Robustness: Furan–Maleimide Diels–Alder Cycloadditions in Polymer Networks for Ambient Applications

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2543 ◽  
Author(s):  
Dorothee Ehrhardt ◽  
Jessica Mangialetto ◽  
Jolien Bertouille ◽  
Kurt Van Durme ◽  
Bruno Van Mele ◽  
...  
Keyword(s):  
Structural Integrity ◽  
Network Formation ◽  
Polymer Networks ◽  
Mechanical Analysis ◽  
Diels Alder ◽  
Self Healing ◽  
Ambient Conditions ◽  
Scanning Calorimetry ◽  
Diffusion Controlled ◽  
Cure Temperature

Two reversible polymer networks, based on Diels–Alder cycloadditions, are selected to discuss the opportunities of mobility-controlled self-healing in ambient conditions for which information is lacking in literature. The main methods for this study are (modulated temperature) differential scanning calorimetry, microcalorimetry, dynamic rheometry, dynamic mechanical analysis, and kinetic simulations. The reversible network 3M-3F630 is chosen to study the conceptual aspects of diffusion-controlled Diels–Alder reactions from 20 to 65 °C. Network formation by gelation is proven and above 30 °C gelled glasses are formed, while cure below 30 °C gives ungelled glasses. The slow progress of Diels–Alder reactions in mobility-restricted conditions is proven by the further increase of the system’s glass transition temperature by 24 °C beyond the cure temperature of 20 °C. These findings are employed in the reversible network 3M-F375PMA, which is UV-polymerized, starting from a Diels–Alder methacrylate pre-polymer. Self-healing of microcracks in diffusion-controlled conditions is demonstrated at 20 °C. De-gelation measurements show the structural integrity of both networks up to at least 150 °C. Moreover, mechanical robustness in 3M-F375PMA is maintained by the poly(methacrylate) chains to at least 120 °C. The self-healing capacity is simulated in an ambient temperature window between −40 and 85 °C, supporting its applicability as self-healing encapsulant in photovoltaics.

scholarly journals A facile approach to durable, transparent and self-healing coatings with enhanced hardness based on Diels-Alder polymer networks

2020 ◽  
Vol 147 ◽  
pp. 105840 ◽  
Author(s):  
Giovanni Fortunato ◽  
Vincenzo Marroccoli ◽  
Francesca Corsini ◽  
Stefano Turri ◽  
Gianmarco Griffini
Keyword(s):  
Polymer Networks ◽  
Diels Alder ◽  
Self Healing

Oxime crosslinked polymer networks: Is every reversible covalent bond suitable to create self-healing polymers?

2016 ◽  
Vol 133 (44) ◽  
Author(s):  
Natascha Kuhl ◽  
Marcus Abend ◽  
Stefan Bode ◽  
Ulrich S. Schubert ◽  
Martin D. Hager
Keyword(s):  
Polymer Networks ◽  
Covalent Bond ◽  
Self Healing ◽  
Crosslinked Polymer ◽  
Reversible Covalent

scholarly journals Dynamic Semi IPNs with Duple Dynamic Linkers: Self-Healing, Reprocessing, Welding, and Shape Memory Behaviors

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1679
Author(s):  
Yanning Zeng ◽  
Weiming Yang ◽  
Shuxin Liu ◽  
Xiahui Shi ◽  
Aoqian Xi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shape Memory ◽  
Material Properties ◽  
Dynamic Properties ◽  
Thermoplastic Polyurethane ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Diels Alder ◽  
Self Healing ◽  
Boronic Ester

Thermoset polymers show favorable material properties, while bringing about environmental pollution due to non-reprocessing and unrecyclable. Diels–Alder (DA) chemistry or reversible exchange boronic ester bonds have been employed to fabricate recycled polymers with covalent adaptable networks (CANs). Herein, a novel type of CANs with multiple dynamic linkers (DA chemistry and boronic ester bonds) was firstly constructed based on a linear copolymer of styrene and furfuryl methacrylate and boronic ester crosslinker. Thermoplastic polyurethane is introduced into the CANs to give a semi Interpenetrating Polymer Networks (semi IPNs) to enhance the properties of the CANs. We describe the synthesis and dynamic properties of semi IPNs. Because of the DA reaction and transesterification of boronic ester bonds, the topologies of semi IPNs can be altered, contributing to the reprocessing, self-healing, welding, and shape memory behaviors of the produced polymer. Through a microinjection technique, the cut samples of the semi IPNs can be reshaped and mechanical properties of the recycled samples can be well-restored after being remolded at 190 °C for 5 min.

scholarly journals Multifunctionality in Polymer Networks by Dynamic of Coordination Bonds

2021 ◽  
Vol 222 (3) ◽  
pp. 2170005
Author(s):  
Pengfei Zhang ◽  
Andraž Rešetič ◽  
Marc Behl ◽  
Andreas Lendlein
Keyword(s):  
Polymer Networks ◽  
Coordination Bonds

Self-Healing Hydrophobic POSS-functionalized Fluorinated Copolymer via RAFT Polymerization and dynamic Diels-Alder Reaction

2021 ◽  
Author(s):  
Siva Ponnupandian ◽  
Prantik Mondal ◽  
Thomas Becker ◽  
Richard Hoogenboom ◽  
Andrew B Lowe ◽  
...  
Keyword(s):  
Chain Transfer ◽  
Raft Polymerization ◽  
Alder Reaction ◽  
Diels Alder ◽  
Self Healing ◽  
Diels Alder Reaction ◽  
Reversible Addition

This investigation reports the preparation of a tailor-made copolymer of furfuryl methacrylate (FMA) and trifluoroethyl methacrylate (TFEMA) via reversible addition-fragmentation chain transfer (RAFT) polymerization. The furfuryl groups of the copolymer...

Self-healing poly(siloxane-urethane) elastomers with remoldability, shape memory and biocompatibility

2016 ◽  
Vol 7 (47) ◽  
pp. 7278-7286 ◽  
Author(s):  
Jian Zhao ◽  
Rui Xu ◽  
Gaoxing Luo ◽  
Jun Wu ◽  
Hesheng Xia
Keyword(s):  
Mechanical Property ◽  
Shape Memory ◽  
Microphase Separation ◽  
Diels Alder ◽  
Good Mechanical Property ◽  
Self Healing ◽  
Healing Efficiency ◽  
Good Biocompatibility

The poly(siloxane-urethane) elastomers with microphase separation structure and Diels–Alder bonds show high healing efficiency, good mechanical property and good biocompatibility.

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