In this study, we successfully prepared nine non-woven, supported polyvinylidene fluoride (PVDF) membranes, using a phase inversion precipitation method, starting from 15 wt % PVDF solution in N-methyl-2-pyrrolidone. Various membrane morphologies were obtained by (1) polymers, with diverse molecular weights ranging 300 to 700 kDa, and (2) different temperature coagulation baths (20, 40, 60 ± 2 °C) used for the film precipitation. An environmental scanning electron microscope (ESEM) was...

Microencapsulation technology is being more and applied in the textile industry because microcapsules can confer additional properties to conventional fabrics. In this context, polysulfone containing vanillin were prepared, their morphology, thermal stability, antibacterial against Staphylococcus aureus assessed. The fabricated onto 100% cotton fabrics by a coating technique. resistance of several washing cycles was studied, durability aromatic finishing determined. Capsules stable range...

Textile detergent and softener industries have incorporated perfume microencapsulation technology to improve their products. Perfume encapsulation allows protection until use provides a long-lasting fragrance release. But, certain industrial microcapsules show low capacity material stability. Polysulfone capsules been already proposed solve these drawbacks. Among them, PSf/Vanillin were considered as desirable system. They present both good stability high capacity. However, several factors...

The global polyvinyldene flouride market is estimated to reach $937,278.5 thousand by 2019, therefore develop new membranes and gain pioneering ideas, which could create innovative business opportunities, a fundamental knowledge about membrane properties fabricated from recent commercially available PVDF polymers highly mandatory. In this study, we successfully prepared nine non-woven supported using phase inversion precipitation method starting 15 wt% solution in...

Despite the well-documented benefits of working in teams, teamwork also results communication, coordination and management costs may lead to personal conflict between team members. In a context where teams play an increasingly important role, it is major importance understand develop diagnostic tools avert it. Here, we investigate empirically whether possible quantitatively predict future small using parameter-free models social network structure. We analyze data appearance resolution 86...

Microencapsulation has been successfully implemented in various fields of science. It can be used to remove, protect, preserve and disseminate many substances. The objective this work is investigate the vanillin release from polysulfone macrocapsules as a first approach characterize microcapsules afterward. capsules were synthesized polymer, dimethyl formamide solvent, active agent, by phase inversion precipitation. Morphological characterization was made scanning electron microscopy....

ABSTRACT Several composite membranes have been prepared from cellulose triacetate (CTA) and activated carbon (AC) by solvent casting, varying temperature 35 to 55°C relative humidity (RH): 10–70%. Some conditions promoted AC particle agglomeration which is evidenced SEM IFME ® program. In those membranes, where homogeneity attained, a deep characterization has carried out DMA, MDSC, thermoporometry, solute transport, AFM. When added in films, T g lowered the fraction of pores with bigger...

Leadership positions are still stereotyped as masculine, especially in male-dominated fields (e.g., engineering). So how do gender stereotypes affect the evaluation of leaders and team cohesiveness process development? In our study participants worked 45 small teams (4-5 members). Each was headed by either a female or male leader, so that (33% women) supervised 258 members (39% women). Over period nine months, developed specific engineering projects part their professional undergraduate...

Abstract For the production of polysulfone microcapsules, a process was proposed, which allowed obtaining capsules with different wall morphology. A solution projected to precipitation bath. Three solvents were assessed: N , ‐dimethylformamide, ‐dimethylacetamide, and ‐methyl‐2‐pyrrolidone. Precipitation baths composed by water, pure or mixed solvent. Surfaces cross–sections preparations observed Scanning Electron Microscopy. The study focused on 30 ± 10 µm diameter. Microcapsules surfaces...

Abstract In this work, chiral activated membranes have been tested for the enantioseparation of racemic drug propranolol. Polysulfone (PS)‐based prepared purpose, using N‐hexadecyl‐L‐hydroxyproline (HHP) and L‐di‐n‐dodecyltartrate (L‐DDT) as carriers, respectively. Kinetic experiments carried out a membrane module with two rectangular channels separated by membrane, which allows well‐defined hydrodynamics feed stripping phases. Propranolol transport across depends on its diffusion rate from...

The applications of polysulfone (PSf) microcapsules have been increasing in the last years. main reason for using PSf as a capsule shell is due to high chemical and physical stability that this material possesses. In addition, it well-known polymer, broadly used by industries moreover, non-toxic biocompatible functional may be employed medical biological applications. Polysulfone preparation carried out easily phase inversion precipitation technique well-established which formation takes...