SynopsisPolycondensations of N,N'bis(hydroxyalky1)pyromellitic diimides, N,N'-bis(hydroxypheny1)pyromellitic diimides, N,N'bis( hydroxyalkyl)-3,3',4,4'-benzophenonetetracarboxylic diimides and N,N'-bis(hydroxyphenyl)-3,3'-4,4'-benzophenonetetracarboxylic diimides with aromatic disulfonyl chlorides were carried out in pyridine to produce poly(imide-su1fonate)s. The resulting polymers had inherent viscosities in the range of 0.25-0.38 dL/g. These poly(imide-su1fonate)s were insoluble in common organic solvents and had relatively good thermal stability. The TGA data showed 10% weight losses at 253-365OC and residual weights a t 50OOC were 22-72% in nitrogen.a Observed in TGA in nitrogen (5"Wmin).Residual weight.
A series of novel aromatic diamines (1−3)
containing kinked cyclohexylidene moieties was
synthesized by a reaction of excess aniline and corresponding
methyl-substituted cyclohexanone
derivatives. The structures of (1−3) were
identifield by 1H NMR, 13C NMR, and FT-IR.
The polymers
were synthesized from the obtained diamines and various aromatic
dianhydrides by the conventional
polycondensation reaction followed by chemical imidization as well as
high-temperature one-step
polymerization. The inherent viscosities and weight-average
molecular weights of the resulting polyimides
were in the ranges of 0.55−1.58 dL/g and (7.4−15.2) ×
104 g/mol, respectively. The prepared
polyimides
showed excellent thermal stabilities and good solubility. All
polymers were readily soluble in common
organic solvents such as tetrahydrofuran, chloroform,
tetrachloroethane, etc., and the glass transition
temperatures were observed at 290−372 °C.
The addition of iodide ions promoted the vertical growth of nanoplate structures in a well-defined kinetically controlled synthetic route, resulting in small thick nanoplates.
Summary: Polymer blend nanocomposites containing linear low density polyethylene (LLDPE), nylon 6 and organoclays were prepared by melt mixing, and their morphologies and structures were examined with a field emission scanning electron microscope (FE‐SEM) and an X‐ray diffractometer (XRD). The size of phase‐separated domains decreased considerably with increasing content of organoclay. The d‐spacing of organoclay in the nanocomposites was increased from about 18.6 to over 28 Å. This effect was highly dependent on nylon 6 contents because nylon 6 is more polar and shows higher affinity to the organoclays compared to LLDPE.
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