It is a great challenge to develop semicrystalline polyimides exhibited significant recrystallization ability and fast crystallization kinetics from the melt. A series of semicrystalline polyimides based on 1,4-bis(3,4-dicarboxyphenoxy)benzene dianhydride (HQDPA) and different diamines, including 1,3-bis(4-aminophenoxy)benzene (TPER), 1,4-bis(4-aminophenoxy)benzene (TPEQ), 4,4′-oxydianiline (4,...

Poly(trimethylene terephthalate) nanocomposites containing COOH functionalized multi-walled nanotubes were synthesized with in situ polymerization method. The microstructure of the nanocomposites was studied by SEM, in terms of the dispersion state of the nanotubes and the polymer–nanotube interface. The thermal behaviour, mechanical properties and conductivity of these resultant PTT/MWCNTs nan...

Poly(3-hydroxybutyrate) (PHB) is a natural biopolyester accumulated in microbial cells as tiny amorphous granules. The nanomicro-particles have a variety of potential applications and behave differently in different environments. In this work, the in situ crystallization of native PHB granules was investigated under different environmental conditions. The isothermal crystallization kinetics of ...

The nucleation process of lithium germanium-phosphate glass was studied to determine the temperature range and maximum rate. differential thermal analysis (DTA), scanning electron microscope (SEM) were used reveal nonisothermal isothermal nucleation, respectively. crystallization occurred at a high homogeneous rate spherulitic crystal growth morphology. Nanostructured samples obtained.

Abstract Casting powders or mold fluxes, as they are more commonly known, used in the continuous casting of steel to prevent shell from sticking copper mold. The first melt and create a pool liquid flux above mold, then fluxes penetrate into gap between water-cooled shell, where crystallization solid phases takes place temperatures gradually drop. It is important understand behavior these becau...

The work is devoted to the study of effect an aqueous medium on a polymeric biodegradable material based poly-3- hydroxybutyrate (PHB) by differential scanning calorimetry (DSC). To analyze structural reorganizations polymer, we studied process polymer crystallization after soaking in distilled water. It shown that exposure water, forms exotherms change, rate decreases, and heat decreases insig...

Stereocomplex poly(lactide) (PLA) was obtained by solution blending of linear PLLA and PDLA-PEG-PDLA. Effects of the L/D ratios, PEG block, and PDLA block on stereocomplexation of the blends are systemically discussed. The full stereocomplex PLA can be acquired by solution blending when L/D ratios are in the range of 7/3–5/5. The experiment results demonstrated that the stereocomplex degree of ...