Recyclable, shape-memory, and self-healing soy oil-based polyurethane crosslinked by a thermoreversible Diels-Alder reaction

2017 ◽  
Vol 135 (13) ◽  
pp. 46049 ◽  
Author(s):  
Kaiwen Zheng ◽  
Yazhou Tian ◽  
Mengjin Fan ◽  
Junying Zhang ◽  
Jue Cheng
Keyword(s):  
Shape Memory ◽  
Alder Reaction ◽  
Diels Alder ◽  
Soy Oil ◽  
Self Healing ◽  
Diels Alder Reaction

A novel shape memory-assisted and thermo-induced self-healing boron nitride/epoxy composites based on Diels–Alder reaction

2020 ◽  
Vol 55 (25) ◽  
pp. 11325-11338 ◽  
Author(s):  
Ying Cao ◽  
Jiatian Zhang ◽  
Dandan Zhang ◽  
Yan Lv ◽  
Jie Li ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Shape Memory ◽  
Alder Reaction ◽  
Diels Alder ◽  
Epoxy Composites ◽  
Self Healing ◽  
Diels Alder Reaction

scholarly journals Multifunctional Biodegradable Polymers with Room Temperature Self-Healing and Rewritable Shape Memory Properties via Diels-Alder Reaction

2018 ◽  
Author(s):  
Shenyang Cai ◽  
Zhe Qiang ◽  
Chao Zeng ◽  
Jie Ren
Keyword(s):  
Shape Memory ◽  
Room Temperature ◽  
Crosslinking Density ◽  
Alder Reaction ◽  
Diels Alder ◽  
Poly Lactic Acid ◽  
Crosslinking Reaction ◽  
Self Healing ◽  
Diels Alder Reaction ◽  
Shape Memory Properties

Here, we present a series of novel block copolymers (BCP) from bio-derived monomers, poly(lactic acid)-block-poly(2,5-furandimethylene succinate) (PLA-b-PFS), in which the furan groups from PFS block can be crosslinked with bis(maleimido) triethylene glycol (M2) through a Diels-Alder reaction. This dynamic crosslinking reaction leads to a network structure for enhancing the mechanical properties compared to their linear BCP analogous. Decreasing the crosslinking density leads to a decrease of glass transition temperature of BCPs and a transition from glassy to rubbery-like behavior at room temperature. This allows a wide tunablity of both elastic moduli and yields of the materials. For the lowest crosslinking density. the material exhibits an over 50% self-healing efficiency at room temperature after five days, attributed to the low Tg (15.2 C) from the introduction of PFS block, allowing sufficient chain mobility for structure re-organization. Moreover, with the appropriate selection of crosslinking density (PLA-b-PFS/M2 (6/1)), it also shows an excellent shape memory property with a high recovery rate of 96.3% and a fixity rate of 97.3%. The permanent shape can be rewriteable due to the reversibility of Diels-Alder reaction. With these advanced functionalities and ease in large-scale fabrication, the PLA-b-PFS/M2 shows great promises for self-healing coatings or films with shape memory properties in a wide variety of applications such as packaging materials

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...

New Chain Extenders for Self-Healing Polymers

2021 ◽  
Vol 899 ◽  
pp. 628-637
Author(s):  
Daria V. Zakharova ◽  
Zalina A. Lok’yaeva ◽  
Alexander A. Pavlov ◽  
Alexander V. Polezhaev
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Hydroxyl Groups ◽  
Structural Fragment ◽  
Self Healing ◽  
Diels Alder Reaction ◽  
Small Series ◽  
Chain Extenders ◽  
Reversible Covalent ◽  
Thermochemical Parameters

We present here a small series of compounds designed to modify the polymer chain of various polyurethanes in order to introduce a structural fragment with the ability of thermally-triggered reversible covalent interactions. Bismaleimides (2a-2e) were synthesized from commercially available aromatic and aliphatic symmetric diamines (1a-1e) and were further introduced into the Diels-Alder reaction with furfuryl alcohol as dienophiles. The Diels-Alder adducts (3a-3e) were obtained as a mixture of endo- and exo-isomer. The presence of symmetrical hydroxyl groups in the structure of the obtained compounds makes them suitable as chain extenders of low molecular weight diisocyanate prepolymers. The presence of a thermally reversible Diels-Alder reaction adduct in the structure of potential chain-extenders opens a possibility to create unique materials with self-healing properties. All compounds obtained were characterized by 1H, 13C NMR, ESI-HRMS, and IR spectroscopy. The thermochemical parameters of the reverse Diels-Alder reaction were established using DSC analysis.

Bio-based self-healing coatings based on thermo-reversible Diels-Alder reaction

2017 ◽  
Vol 111 ◽  
pp. 38-46 ◽  
Author(s):  
Daniel H. Turkenburg ◽  
Yvon Durant ◽  
Hartmut R. Fischer
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Self Healing ◽  
Diels Alder Reaction

Self-healing behavior of polyurethanes based on dual actions of thermo-reversible Diels-Alder reaction and thermal movement of molecular chains

Polymer ◽  
2017 ◽  
Vol 124 ◽  
pp. 48-59 ◽  
Author(s):  
Libang Feng ◽  
Zhengyang Yu ◽  
Yaohui Bian ◽  
Junshan Lu ◽  
Xueting Shi ◽  
...  
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Self Healing ◽  
Diels Alder Reaction ◽  
Thermal Movement
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