Sornkamnerd, Saranyoo; Sasaki, Shuhei; Mitsumata, Tetsu; Takada, Kenji; Okada, Tomohiro; Ando, Shinji; Kaneko, Tatsuo published the artcile< Orientation Analysis of Polymer Chains in Optically Transparent Biopolyimides Having Rigid and Bending Backbones>, Name: Cyclobuta[1,2-c:3,4-c’]difuran-1,3,4,6(3aH,3bH,6aH,6bH)-tetraone, the main research area is optically transparent biopolyimide polymer chain orientation.
Optically transparent and heat-resistant polymer films are useful in the field of organic glasses usable for elec. insulators for panels, windows, optical devices, etc. A series of biopolyimides having non-π-conjugated backbones prepared using a renewable diamine, 4,4′-diaminotruxillic acid di-Me esters, and various dianhydride monomers were prepared and cast onto substrates to form transparent films with high heat resistances and good elec. resistance. The second order orientation coefficients (P200) of the biopolyimide films were evaluated by polarized attenuated total reflection Fourier-transform IR spectroscopy, and the P200 values for the C-N stretching vibrations at a wavenumber of 1365 cm-1 displayed a good correlation with that for the aromatic C-C stretching at 1510 cm-1, regardless of the dianhydride structure. The in-plane/out-of-plane birefringence and coefficients of linear thermal expansion exhibited strong correlations with P200 except for those of a few samples. Most of the biopolyimide films exhibited good transparencies with low birefringence and high elec. resistance, which are applicable to flexible substrates with a low coefficient of thermal expansion for panel displays.
ChemistrySelect published new progress about Birefringence. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Name: Cyclobuta[1,2-c:3,4-c’]difuran-1,3,4,6(3aH,3bH,6aH,6bH)-tetraone.
Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem