Shan, Shijie published the artcileStretchable, robust and reprocessable poly(siloxane-urethanes) elastomers based on exchangeable aromatic disulfides, Category: catalysis-chemistry, the publication is Polymer (2021), 123588, database is CAplus.
The rapid expansion of dynamic covalent chem. world urges for materials not only possessing high mech. properties and stretchability, but also including high reprocessability and reforming. Herein, aromatic disulfide-containing polysiloxanes elastomers with modified urea as chain-extender and crosslinker were first designed and fabricated. Dynamic crosslinks, including hydrogen bonding formed between urea and amide bonds, and aromatic disulfide are connected with polysiloxanes backbones through isocyanate (DTSA-HDI) reacted with systematically controlled aminopropyl groups in the side chains. Consequently, a series of ATPx-SS elastomers with polysiloxanes of different mol. weight and APPx-SS elastomers with different crosslinking densities are developed. The molar amount of DTSA-HDI has been proved to play a crucial role in adjusting the mech. and thermal properties of the networks. Among all, ATP3-SS showed the best stretchability, of which the elongation at break was as high as 780%. APP1-SS achieved the highest tensile strength of 2.60 MPa. Besides, it has outstanding reprocessability and can be reprocessed and reformed without much decline of tensile strength after several cycles of hot-pressing. These remarkable properties demonstrate that the aromatic disulfide-containing elastomers are competitive to those un-filled polysiloxanes elastomers based on dynamic bonds ever reported.
Polymer published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C7H10O4, Category: catalysis-chemistry.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia