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Polyimide/layered silicate nanocomposites were prepared via in situ polymerization process from PMDA-ODA and organo-MMT in a solution of N,N-dimethylacetamide. XRD, FTIR, UV–vis analyses showed that at the content of 1wt% MMT, MMT were well intercalated, exfoliated and dispersed in polyimide matrix. As the MMT content is more than 3wt%, MMT agglomerates became severe as shown by the transparency and...
Micro-banded textures developed from thin films of a main-chain thermotropic liquid crystalline chloro-poly(aryl ether ketone) in the melt were investigated using transmission electron microscopy (TEM), selective area electron diffraction, and atomic force microscopy techniques. The micro-banded textures were formed in the copolymer thin films after annealing at temperatures between 320 and 330 ...
A thermotropic liquid crystalline (LC) polyether was synthesized by condensation polymerization of 1-(4-hydroxyphenyl-2-(2-methyl-4-hydroxypheyl)ethane) and α,ω-dibromononane, and abbreviated as MBPE-9. Multiple phase transitions were found via differential scanning calorimetry (DSC) upon heating and cooling. Based on wide-angle X-ray diffraction (WAXD) and polarized light microscopy (PLM) experiments,...
Poly(trimethlene teraphthalate) (PTT) is one of the terephthalic polyester family members which can crystallize between its glass transition and melting temperatures. The crystal structure has been determined using both electron diffraction (ED) on single crystals and wide angle X-ray diffraction on powder and oriented fibers. The unit cell is triclinic with dimensions of a=0.46 (3)nm, b=0.61(2)nm,c=1...
Formulas for correlating morphological parameters in mixtures containing polydisperse hard particles are important for investigating the relationships of the properties of these mixtures with morphological parameters. Two simple new formulas are derived, respectively for relating the number averaged surface to surface or center to center interparticle distances between impenetrable particles with...
It has been demonstrated in Part I of this research that the high degree of plastic deformation caused by the equal channel angular extrusion (ECAE) process leads to a nearly uniform molecular orientation across the extruded polycarbonate (PC) plate. In this paper, the effectiveness of the ECAE process in altering the mechanical property of PC is investigated. Significant improvements in flexural...
The layer-by-layer self-assembly of polyaniline (PAN) and polyacrylic acid (PAA) has been accomplished via the alternate spontaneous adsorption of base-type PAN from its dilute N-methylpyrrolidinone solution and PAA from its aqueous solution based on the acid–base reaction of PAN and PAA. The thickness of the films can be manipulated at nanometer scale by the concentration of PAN solution and recycling...
The relations among the morphological parameters of binary polymer blends with the morphology of well-dispersed particles are quantitatively studied to correct the error from the simple cubic (sc) lattice assumption made in previous works. A new morphological parameter, the particle spatial distribution parameter ξ, is defined. A new equation for correlating the spatial distribution with other morphological...
Specimens consisting of high-purity β-phase polypropylene were prepared by adding a bicomponent β-nucleator consisting of equal amounts of pimelic acid and calcium stearate. Scanning electron microscopy (SEM), differential scanning calorimetry (d.s.c.), dynamic mechanical analysis and instrumented drop weight impact tests were used to characterize the morphology, thermal behaviour and the impact...
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