3 research outputs found
1H NMR and FT-IR dataset based structural investigation of poly(amic acid)s and polyimides from 4,4′-diaminostilbene
Structural investigation of polymers by various available analytical methods is important in order to correlate the structure with polymer properties for which understanding of polymer structure is very important factor. The data presented here in this article shows the 1H NMR spectra used for the characterization of prepared poly(amic acid)s (PAAs). It is often difficult to assigns the peak in NMR of polymers due to its complexity. Data presented here helps in assigning the proton peak in complex NMR of PAAs prepared from aromatic diamines. Further functionality in polymer chains can be confirmed by FT-IR spectra. Change in functionality during some reaction or process can be monitored by disappearance or appearance of peaks in FT-IR. The complete imidization of PAAs to Polyimides (PIs) is difficult to analyze because of the chemical stability i.e. insolubility of PIs in most of the solvent therefore the completion of imidization process was confirmed using FTIR
Ultrastrong, Transparent Polytruxillamides Derived from Microbial Photodimers
Ultrastrong and transparent bioplastics
are generated from fermented
microbial monomers. An exotic aromatic amino acid, 4-aminocinnamic
acid, was prepared from a biomass using recombinant bacteria, and quantitatively photodimerized, and diacid
and diamino monomers that were both characterized by a rigid α-truxillate
structure were generated. These two monomers were polycondensed to
create the polyamides with a phenylenecyclobutane repeating
backbone such as poly{(4,4′-diyl-α-truxillic acid dimethyl
ester) 4,4′-diacetamido-α-truxillamide} which was processed
into amorphous fibers and plastic films having high transparency.
In spite of noncrystalline structure, mechanical strength of the fiber
is 407 MPa at maximum higher than those of other transparent plastics
and borosilicate glasses, presumably due to the tentative molecular
spring function of the phenylenecyclobutanyl backbone