Recyclable shape-memory polymer: Poly(lactic acid) crosslinked by a thermoreversible Diels-Alder reaction

2009 ◽  
Vol 112 (2) ◽  
pp. 876-885 ◽  
Author(s):  
Kazuhiko Inoue ◽  
Midori Yamashiro ◽  
Masatoshi Iji
Keyword(s):  
Lactic Acid ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Alder Reaction ◽  
Diels Alder ◽  
Poly Lactic Acid ◽  
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

scholarly journals Synthesis of a polycaprolactone-based material with shape-memory and mendability

2016 ◽  
Vol 19 (3) ◽  
pp. 90-98
Author(s):  
Tri Minh Phan ◽  
Thuy Thu Truong ◽  
Thanh Dac Nguyen
Keyword(s):  
Shape Memory ◽  
Optical Microscopy ◽  
1H Nmr ◽  
Alder Reaction ◽  
Diels Alder ◽  
Diels Alder Reaction ◽  
Furan Compound ◽  
Ft Ir ◽  
Mild Temperature ◽  
Tga And Dsc

new thermoset has been prepared from a bismaleimidic terminated polycaprolactone polyester and a tris-furan compound acting as a crosslinker via the Diels-Alder reaction between the furan and maleimide functionalities. Owing to the reversibility of the Diels-Alder chemistry and the increased mobility of the crosslinked polyester chains, this material had the ability to mend scratches under mild temperature conditions. The synthesized precursors and resulting crosslinked material were characterized using 1H NMR, FT-IR, GPC, TGA and DSC methods. The scratch mendability of the material was investigated using optical microscopy.

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

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

The Diels-Alder Reaction of 2-Ethenyl-1,4-Benzodioxin: A New and Simple Synthesis of Bisaryl Ethers

Synlett ◽  
1989 ◽  
Vol 1989 (01) ◽  
pp. 30-32
Author(s):  
Thomas V. Lee ◽  
Alistair J. Leigh ◽  
Christopher B. Chapleo
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Simple Synthesis ◽  
Diels Alder Reaction
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