We study the effect of cyclization a linear poly(styrene-b-isoprene) PS−PI copolymer on morphology micelles formed in heptane (a selective solvent for PI). The and cyclic copolymers have exactly same degree polymerization, i.e. 290 PS 110 PI, i.e., volume fraction ΦPS = 0.78. use dynamic light scattering (DLS) atomic force microscopy (AFM) techniques to characterize micellar made from molecules, focusing cyclization. also report concentration micelle size shape copolymers. Our results show...

The preparation of biocompatible nanocarriers that have potential applications in the cosmetic and health industries is highly desired. self-assembly amphiphilic block copolymers displaying biosourced polysaccharides at surface one most promising approaches. In continuity our works related to "hybrid" oligosaccharide-based copolymers, we present here design a new generation self-assembled nanoparticles composed entirely co-oligomers (BCO). These systems are defined by covalent linkage two...

We have studied the effect of polystyrene (PS) homopolymer addition on morphology self-assembled block copolymer micelles made from linear or cyclic poly(styrene-b-isoprene), PS-b-PI, in a selective solvent for PI (heptane). Both copolymers same composition: degree polymerization is 290 PS block, and 110 we focused influence small amounts micellar morphology. For concentrations considered, self-organizes into spherical while forms cylindrical micelles. chains constitute core corona these...

In this work, the structural, mechanical, diffractometric, and thermal parameters of chitosan-hydroxypropylmethylcellulose (HPMC) films plasticized with sorbitol were studied. Solutions HPMC (2% w/v) in water chitosan 2% acetic acid solution prepared. The concentration used was 10% (w/w) to both polymers. This solutions mixed at different proportions (100/0; 70/30; 50/50; 30/70, 0/100) HPMC, respectively, 20 mL cast Petri dishes for further analysis dried films. miscibility polymers assessed...

The binding characteristics of aggregates formed between neutral polymer (PVP) and anionic surfactant (SDS) are explored by light scattering. As added SDS binds to PVP polymers, the mass increase scattering is reflected in higher scattered intensity, so long as electrostatic interactions due charge (as second virial coefficient, A2) suppressed high ionic strength. Although there an equilibrium bound free SDS, majority observed SDS/PVP aggregates. These appear consist single chains with...

One of the most interesting and fascinating solution properties block copolymers is their ability to self-assemble into micelles, lamellar aggregates, vesicles. Such organized structures have made diblock great importance in nanotechnology applications.1-11 For instance, spontaneously formed vesicles water are potentially useful as vehicles for delivering drugs biomimetic models biological cells. We show here first time that cyclization a linear copolymer chain induces remarkable change...

Micelles made from linear polystyrene-block-polyisoprene (PS/PI) in decane are spherical. The differences the structure of micelles and cyclic PS/PI were investigated using small-angle X-ray scattering at rest under shear flow. effect revealed that copolymer chains have an elongated shape, which was confirmed by transmission electron microscopy. cyclization diblock is thus a new method to control micellar morphology.

A simple, rapid, and sensitive fluorimetric method was developed validated to quantify curcumin in lipid polymeric nanocapsule suspensions, using acetonitrile as a solvent. The excitation emission wavelengths were set at 397 nm 508 nm, respectively. calibration graph linear from 0.1 0.6 µg/mL with correlation coefficient of 0.9982. detection quantitation limits 0.03 0.10 µg/mL, validation results confirmed that the is specific, linear, accurate, precise for its intended use. current...

Four modified hyperbranched polyethylene imines (PEIs) were synthesized by means of the alkylation PEI. SAXS, viscosity, surface tension, and pyrene fluorescence emission then used as techniques to examine conformation aggregation PEIs in aqueous solution, absence presence sodium dodecylsulfate (SDS). Analysis SAXS data showed that radius gyration decreases with an increase alkyl chain length polymer, while viscosity indicated a decrease intrinsic under same conditions. The nonmodified PEI...

The formation of supramolecular complexes produced by association poly(ethyleneimine) (PEI) and mixtures sodium cholate (NaC) dodecyl sulfate (SDS) was investigated pH, electrical conductivity, fluorescence spectroscopy small angle X-ray scattering (SAXS) measurements. linked to previously measured values pH conductivity led the conclusion that NaC SDS molecules firstly bind specific sites PEI chains via electrostatic interaction secondly undergo self-assembly through regular cooperative...

The polyelectrolyte nature of the aggregates formed between neutral polymer, poly(vinyl pyrrolidone) (PVP) and anionic surfactant, sodium dodecyl sulfate (SDS) is demonstrated via their light scattering behavior. Adding SDS to PVP similar electrostatically charging a thereby increasing electrostatic excluded volume effects decreasing osmotic compressibility scattering. Similarly, once formed, behavior these with respect ionic strength resembles that normal linear polyelectrolytes; namely,...

We have studied the morphology of self-assembled micelles made linear and cyclic poly(styrene-b-isoprene) PS-b-PI block copolymers dispersed in selective solvents PI (n-heptane, n-decane). Up to a copolymer concentration 5 mg mL(-1), from chains adopt spherical shape. Those arising having exactly same molar mass volume fraction self-assemble into (i) planar sunflower-shaped particles at low (c < 0.1 mL(-1)), (ii) giant wormlike intermediate (0.1 mL(-1) c 2 mL(-1)) (iii) vesicles higher (2...

Amphiphilic polymers are synthesized from various biobased compounds involving telomerization of glycerin‐derived acrylate monomers with mercaptan‐modified fatty acids. The effects the chemical structure saturated or unsaturated hydrophobic block investigated. Dynamic and static light scattering measurements, transmission electronic microscopy, atomic force microscopy observations show that these copolymers capable self‐assembling into nanosized spherical particles in aqueous solution, made...

The morphology of micelles formed from blends linear and cyclic poly(styrene-b-isoprene) (PS-b-PI) block copolymers has been investigated in solution using dynamic light scattering (DLS) thin solid deposits by atomic force microscopy (AFM) transmission electron under cryogenic conditions (cryo-TEM). Micelles the pure PS(290)-b-PI(110) are wormlike cylindrical objects built unidirectional aggregation 33 nm wide sunflower micelles, while copolymer having same volume fraction molar mass forms...

Morphological and conformational transitions of lentinan (LT), a β-glucan extracted from Shiitake mushrooms (Lentinula edodes), were investigated at different concentrations aqueous NaOH, using Small Angle X-ray Scattering (SAXS) technique. At low NaOH(aq) concentration LT chains are self-associated adopt the triple helix form where as higher NaOH polymer undergo transition to random coil chains. Also, presence fractal dimensions was observed through analysis exponential decay scattering...

Three polymer-surfactant systems comprised of branched polyethylene imine (PEI) with an anionic surfactant (sodium dodecylsulfate; SDS), a cationic (tetradecyltrimethylammonium bromide; TTAB), and zwitterionic (N-tetradecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate; SB3-14) were studied based on the properties surface tension, pyrene fluorescence emission, dynamic light scattering, pH, zeta potential measurements.The critical aggregation concentration (cac) polymer saturation point (psp)...