Incorporation in the molecular structure of polyimides of asymmetric alicyclic
DOCDA or symmetric alicyclic
BOCA moieties, together with aromatic diamine units containing ether and/or sulfonic linkages, reduces electronic conjugation along the macromolecular chain to different extents.
of polyimides based on aromatic and alicyclic
sup-1]), methylene [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] and alicyclic
groups at 1465 and 2940 [cm.
These high values of both microstructural parameters relating to these BODA-based polyimides can be attributed to the alicyclic
structure, which induces steric hindrance for chain packing.
7] combined the methods of UV-, IR-, NMR H and 13C spectroscopy and showed that in shale oil fraction 300-320 [degrees]C aromatic ketones are not prevalent, and ketones are represented mostly by alicyclic
ketones and alkanones.
Several types of amine curing agents, such as aliphatic, alicyclic
, and aromatic amines, are used in combination with DGEBA oligomers in various applications (1).
Tetralin [Mathematical Expression Omitted] and fractions of paraffin oils (mixture of paraffin hydrocarbons, aromatic and alicyclic
hydrocarbons) were used as solvents.
PBCS by incorporation of alicyclic
units 1,4-cyclohexanedimethanol (CHDM) into PBS backbone has been extensively investigated on the biodegradability and biocompatibility , The chemical composition of PBCS series (PBCSs) plays an important role in controlling the physical properties.