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We identified the conformational structure, aggregation behavior and photophysical properties of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) in various toluene/nonane solutions dependent on nonane content. In dilute solution region (e.g., below the overlap concentration, c*), static light scattering (SLS) revealed that the stiffness of MEH-PPV decreased as nonane content was...
Multiwalled carbon nanotubes (MWCNTs) were modified via polymerization of styrene under microwave irradiation, and polystyrene (PS)–MWCNT composites with individual-dispersed nanotubes were prepared by melt-mixing using industrial extruder and injection moulding machine. The microscopic morphologies of modified MWCNTs (m-MWCNTs) and composites were studied through transmission electronic microscopy...
The morphology and thermal properties of isothermal crystallized binary blends of poly(propylene-co-ethylene) copolymer (PP-co-PE) and isotactic polypropylene (iPP) with low molecular weight polyethylene (PE) were studied with differential scanning calorimeter (DSC), dynamic mechanical analysis (DMA), polarized optical microscopy (POM) and wide-angle X-ray diffraction (WAXD). In PP-co-PE/PE binary...
The isothermal crystallization kinetics and morphology development of isotactic polypropylene (iPP) blended with small loading of nanostructure of polyhedral oligomeric silsesquioxane (POSS) were studied with differential scanning calorimetry (DSC), polarized optical microscopy (POM), and wide-angle X-ray diffraction (WAXD). The crystallization behaviors of iPP/POSS composites presented an unusual...
An easy process for the synthesis of poly(methyl methacrylate)/Ce(OH) 3 , Pr 2 O 3 /graphite nanosheet (PMMA/Ce(OH) 3 , Pr 2 O 3 /NanoG) composite was developed. Graphite nanosheets (NanoG) were prepared by treating the expanded graphite with sonication in aqueous alcohol solution. The PMMA/Ce(OH) 3 , Pr 2 O 3 /NanoG composites...
The thermal properties and morphology development of isotactic polypropylene (iPP) homopolymer and blended with low molecules weigh atactic polypropylene (aPP) at different isothermal crystallization temperature were studied with differential scanning calorimeter and wide-angle X-ray scattering. The results of DSC show that aPP is local miscible with iPP in the amorphous region and presented a phase...
Benzoxazine precursor is synthesized and is tested by torsional braid analysis. The phenomena of gelation and glass transitions which occur in the formation of thermosets are found and studied. In particular, two special secondary glass transitions appear at the curing temperature and the time–temperature-transformation spectrum is obtained.
In this work, the aggregation behavior of polyvinyl chloride/dioxane (PVC/DOA) solution was discussed through light scattering and viscometric measurements. From the static light scattering results, PVC/DOA solution has a negative value of the second virial coefficient, A 2 value (ca. -3.65x10 -4 cm 3 molg -2 ) at 30 o C, implying that a repulsive...
In this work, the network structure and chain mobility of dried polyvinyl chloride/dioxane (PVC/DOA) gels prepared by the freeze-drying method are studied by SEM, FTi.r., WAXD, EDTA and pulsed NMR analyses. The results of FTi.r. and WAXD show no remarkable change in the crystallinity of either dried or wet PVC gels; however, the elasticity of wet gels and the gelation time of semi-dilute solutions...
In this work, the structure and physical properties of polyvinyl chloride (PVC) gels prepared from the solutions of bromobenzene (BrBz) and dioxane (DOA) under different gelation conditions are studied. The average size of the junction point for PVC gels in the initial gelation state are the combination of ca. two to three chains in width and ca. six to eight syndiotactic sequences in length to form...
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