Chế tạo và khảo sát tính chất của vật liệu compozit PVC/hỗn hợp than đen và tro bay biến tính

In this paper, fly ash was modified by stearic acid and mixed with carbon black N330 (CB) in order to prepare PVC/MFA/CB composites (total amount of MFA and CB is 10 wt% in comparison with PVC weight). The effect of CB loading on the morphology, melt viscosity, mechanical and electrical properties of PVC/MFA/CB composites were studied. It was found that CB improved processing ability, tensile strength, and elongation at break of the PVC/MFA composites. If the ratio of CB/MFA in the PVC/MFA/CB composites is 50/50, the torque of PVC/MFA/CB composites decreased 16 % and elongation at break increased 11 %. Dielectric loss was decrease meanwhile dielectric constant, AC resistivity and breakdown voltage (dielectric strength) of the PVC/MFA/CB composites were increase as raising CB content. Keywords. Polyvinylchlorua, PVC composite, carbon black N330, fly ash, dielectric constant, melt viscosity

EFFECT OF POLYCAPROLACTONE ON CHARACTERISTICS AND MORPHOLOGY OF ALGINATE/CHITOSAN/LOVASTATINE COMPOSITE FILMS

In this work, alginate (AG)/chitosan (CS)/lovastatine (LS) AG/CS/PCL/LS composite films using polycaprolactone (PCL)  are prepared by solution method with the ratio of AG/CS and LS content fixed at 4/1 and 10 wt.% (in comparison with the total weight of CS and AG), respectively.  The PCL content is used at 3, 5 and 10 wt.% (in compared with total weight of AG, CS and LS). The role of PCL as a compatibilizer in AG)/CS)/LS composites is considered by Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM) and Differential Scanning Calorimetric (DSC) methods. Based on the change in FTIR spectra, morphology and thermal parameters of AG/CS/PCL/LS composites, it can be seen that PCL has effectiveness of compatibility for AG, CS, and LS as well as plasticity for the composites. Besides, the influence of PCL content on the swelling degree of the composites is also investigated.

Tính chất nhiệt và hình thái cấu trúc của tổ hợp polylactic axit/chitosan mang thuốc nifedipin

Polylactic acid (PLA) and chitosan (CS) are two natural resource polymers which have been applied widely into different fields. Polylactic acid (PLA) and chitosan (CS) has been attracted by many researcher due to their good adhesion, biodegradability and biocompatibility. This study expresses hydrolysis of PLA/CS composite with and without polycaprolactones (PCL) as a compatibilizer in acid environment and phosphate buffer solution. The PLA/CS composites were characterized by Fourier Infrared Spectra (FTIR), Scanning Electron Microscopy (SEM) and Differential Scanning Calorimetry (DSC). The hydrolysis of PLA/CS/PCL composites in acid solution (0.1 N) and phosphate buffer solution (pH = 7.4) for different times was also investigated. The content PCL of 6- 8 %wt. is suitable for preparing PLA/CS nanocomposites. Keywords. Polylactic acid, chitosan, polycaprolacton, hydrolysis, weight loss