New Chain-Extenders for Recyclable Cross-Linked Polyurethanes

2021 ◽  
Vol 899 ◽  
pp. 518-524
Author(s):  
Polina F. Ponomareva ◽  
Elena O. Platonova ◽  
Alexander V. Polezhaev
Keyword(s):  
Thermal Properties ◽  
Alder Reaction ◽  
Diels Alder ◽  
Synthetic Method ◽  
Mechanical And Thermal Properties ◽  
Diels Alder Reaction ◽  
Chain Extenders

A synthetic method for the new chain extenders with different amounts of furan groups and a prepolymer derived from three-furyl diol was developed. A series of polyurethanes cross-linked via the Diels-Alder reaction with various amounts of bismaleimide were produced. The structure, mechanical and thermal properties, and recycling ability of the obtained materials were investigated.

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.

Diels–Alder reaction of α-tropolone and electron-deficient dienophiles prompted by Et3N or silica gel: a new synthetic method of highly functionalized homobarrelenone derivatives

Tetrahedron ◽  
2009 ◽  
Vol 65 (51) ◽  
pp. 10709-10714 ◽  
Author(s):  
Hiroaki Okamura ◽  
Hiroki Iiji ◽  
Toshiyuki Hamada ◽  
Tetsuo Iwagawa ◽  
Hiroshi Furuno
Keyword(s):  
Silica Gel ◽  
Alder Reaction ◽  
Diels Alder ◽  
Synthetic Method ◽  
Diels Alder Reaction

New Synthetic Method for Bicyclic Compounds Through a Sequence of Ene-Type Chlorination, Palladium Catalyzed Dehydrochlorination, and Intramolecular Diels-Alder Reaction

1984 ◽  
Vol 14 (4) ◽  
pp. 347-352 ◽  
Author(s):  
Junzo Otera ◽  
Masaki Kishi ◽  
Koichi Kanehira ◽  
Shigeaki Suzuki ◽  
Manzo Shiono ◽  
...  
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Synthetic Method ◽  
Bicyclic Compounds ◽  
Diels Alder Reaction ◽  
Palladium Catalyzed

Palladium-catalyzed tandem carbonylation and intramolecular diels-alder reaction of 4-alken-2-ynyl carbonates: a new synthetic method for polycyclic compounds

1991 ◽  
Vol 32 (52) ◽  
pp. 7687-7688 ◽  
Author(s):  
Tadakatsu Mandai ◽  
Sadahiro Suzuki ◽  
Atsushi Ikawa ◽  
Taro Murakami ◽  
Mikio Kawada ◽  
...  
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Synthetic Method ◽  
Polycyclic Compounds ◽  
Diels Alder Reaction ◽  
Palladium Catalyzed

ChemInform Abstract: NOVEL SYNTHETIC METHOD FOR PIPERITENONES THROUGH DIELS-ALDER REACTION

1985 ◽  
Vol 16 (5) ◽  
Author(s):  
T. MANDAI ◽  
K. OSAKA ◽  
M. KAWAGISHI ◽  
M. KAWADA ◽  
J. OTERA
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Synthetic Method ◽  
Diels Alder Reaction
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