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With a yield of greater than 70%, the asymmetrical alicyclic dianhydride 3,4-dicarboxy-1,2,3,4-tetrahydro-6-methyl-1-naphthalene succinic dianhydride (MTDA, II) was produced from 4-methylstyrene and maleic anhydride.
One-step high temperature polycondensation was used to create a number of semi-alicyclic polyimides (PIs) using MTDA and different aromatic diamines.
To serve as a point of comparison, a different set of PIs (PI-Ia-PI-Id) were created using the same diamines and the similar dianhydride, 3,4-dicarboxy-1,2,3,4-tetrahydro-1-naphthalene succinic dianhydride (TDA, I).
By reducing the intramolecular or intermolecular contacts of the polymer chains, the asymmetrical molecular structure of MTDA gave the resulting PIs good solubilities in common solvents and high optical transparencies in the ultraviolet and visible light areas.
Glass transition temperatures for the flexible and durable PI films were in the range of 204–271 °C, and they displayed good thermal stability up to 400 °C.
With transmittances >80% at 400 nm, a cut-off wavelength of 300 nm, and a refractive index of 1.54, the PI films demonstrated good optical transparency.
The Global Alicyclic Dianhydride market accounted for $XX Billion in 2021 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2022 to 2030.
Investigations were done on the creation and evaluation of soluble polyimides and copolyimides based on 2,3,5-ticarboxycyclopentyl alicyclic dianhydride dianhydride (TCA-AH) and aromatic diamines.
It was discovered that alicyclic polyimides may be employed as functional polymers for the alignment films in liquid crystal displays and low dielectric materials since they were soluble in organic solvents.
Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were employed to assess the thermal characteristics of the derived soluble polyimides and copolyimides.
Tetralin-1,2-dicarboxylic anhydrides (tetralin-DA) and cyclohexene-DA-based soluble polyimides were discovered to have good solubility and thermal stability.
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