Ranganathan, Palraj published the artcileOptically transparent bio-based polyamides with microcellular foaming properties derived from renewable difunctional aminoamides, Application In Synthesis of 627-93-0, the publication is Journal of Applied Polymer Science (2022), 139(2), 51461, database is CAplus.
A green approach for the synthesis of bio-based polyamides (PAs) with a new macromol. structure was developed. These bio-based PAs were synthesized by solvent and catalyst-free polycondensation combining fatty dimer acid Pripol 1009 with new difunctional aminoamides (DAAs). The later DAAs building blocks were synthesized by aminolysis of renewable di-Me sebacate (DMS) and di-Me adipate (DMA) with 3 different aliphatic diamines having diverse chain lengths, 2, 4, and 6 carbons. Bio-based PAs showed Mw up to 30,581 g/mol, initial thermal degradation over 380°, Tm from 168.3-202.4°C, Tg from 28.3-37.5°C, strain from 36.4 ±4.0-313.5 ±2.0%, and tensile strength up to 27.4 ±0.1 MPa. All the PAs films had excellent optical transparency with cut-off wavelengths of 276.0-283.0 nm, transmittance from 82.7%-90.7% at 600 nm. As a proof-of-concept of their usage, 1 of the PA can form microcellular foam by the green scCO2 method. The foams possessed uniform (cell size; 40μm, foam d.; 0.265 g/cm3, expansion rate; 7.2) and bimodal (cell size; 24/38μm, foam d.; 0.302 g/cm3, expansion rate; 6.5) cell textures depending on their foaming temperatures This is the first report of bio-based PA foams and transparent films manufacturing without toxic solvents.
Journal of Applied Polymer Science published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Application In Synthesis of 627-93-0.
Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics