During the last ten to fifteen years the developments in polymer science has been striking attention and undergone important changes. From rather specialized subject intended for engineers interested in certain definite fields, it has developed into one of the fundamental disciplines common to several branches of engineering and science. To serve this purpose, the subject materials have been prepared to treat a comprehensive aspects of polymer science.
New approaches to tailor-made cellulose/starch/lignin-synthetic polymer graft copolymers with precise control over molecular weight, degree of substitution, backbone-graft linkage, and the overall grafting process are being studied. Cross-linked graft copolymers with exactly defined polymer chain segments between crosslink points have been prepared. The graft copolymers exhibit a two-phase morphology and can function effectively as compatibilizers/interfacial agents to alloy cellulosic and lignocellulosic materials with synthetic polymers.
This book comprises the contributions of several authors in the area of polymer
characterization by atomic force microscopy of the polymer network structure formed
in Ferroelectric Liquid Crystals Cells; polymerization by microwave irradiation
method of starch/acrylic acid/acrylamide; polymerization of olefins; emulsion
polymerization; ring opening polymerization; cationic polymerization of vinyl
monomers ; block and graft copolymerization by controlled/living polymerization;
fabrication of doped microstructures by two-photon polymerization; rheology of
biomaterials; plant cell wall ...
With contributions from many of the world's leading scientists in the field of dendritic research and development, Dendrimers and Other Dendritic Polymers provides a comprehensive review of this rapidly expanding and exciting new field of polymer science. Of interest to academia and industry alike, this book covers the synthesis, characterization, unique properties, potential for novel applications and technical challenges associated with these polymers.
Polymer applications have become more demanding as industry continuously turns to more microscopic parts. Due to the interactions of the polymer chains with the supporting surface and the air interface, the thinner films required for such applications have distinctly different properties than those of the well-defined bulk systems. The goal of the current research is to elucidate the behavior of ultrathin films.
Polylactic acid is one of the most popular bioplastics used in recent years and it is often mixed with other polymers or chemicals to form polymer blend because polylactic acid is able to accelerate biodegradation of polymer blends. This paper presents some results of study on polymer blend based on polylactic acid (PLA) and ethylene-co-vinylacetate copolymer (EVA).
Polymers present a class of materials that play a role of importance growing in catalysis. Polymeric catalysts based on polypropylene-polyacrylic acid (PP-APA) were prepared by the two methods: co-polymerization in the presence of transition metal ions (Cu(II), Fe(III), Co(II), Mn(II)…) and soaking method. Their catalytic activity was determined by oxidation reactions of ions S2- and hydroquinone by molecular oxygen in normal condition.
One of the greatest challenges faced by the food scientist is man himself with his
highly sensitive oral equipment for evaluating food texture. The recognition of this
challenge leads immediately to two questions: ‘How can we characterize the texture of
foodstuffs in a manner that will reflect human perceptions?’ and, then, ‘How may we
preserve, formulate and process products in a way that will be acceptable to the
are not limited to: the wide range of oxidation and reduction reactions possible,
the possibility of reaching very high levels of product purity and selectivity, and
significantly less energy requirement. The process of electropolymerization leads to
simple and reproducible formations of polymer films, which led to a broad material
diversity of applications.
Nowadays, electrochemistry plays an important role in a wide number of fundamental
research and applied areas.
This book is a result of contributions of experts from international scientific community working in different aspects of nanocomposite science and applications and reports on the state of the art research and development findings on nanocomposites through original and innovative research studies.
If the 20th century could be characterized by the rapid increase in the production and
consumption of materials that helped improving the standards of living, then the 21st
certainly has many elements to qualify as the century of recycling. Since the duration
of life of a number of wastes is very small (roughly 40% have duration of life smaller
than one month), there is a vast waste stream that reaches each year to the final
recipients creating a serious environmental problem.
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Core shell hybrids based on noble metal nanoparticles and conjugated polymers: synthesis and characterization
The water soluble crude polysaccharide obtained from cultured mycelia of Cordyceps militaris (CPM)
by hot water extraction followed by ethanol precipitation was fractionated by DEAE cellulose and
Sepharose CL-6B column chromatography. This fractionation process resulted in four polysaccharide
fractions that were termed CPMN Fr I, CPMN Fr II, CPMN Fr III, and CPMN Fr IV. Of these fractions,
CPMN Fr III was able to upregulate the functional events mediated by activated macrophages, such
as production of nitric oxide (NO) and expression of cytokines (IL-1b and TNF-a).
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Synthesis and Characterization of Metal Nanoparticle Embedded Conducting Polymer–Polyoxometalate Composites
Soft matter (or soft condensed matter) refers to a group of systems that includes
polymers, colloids, amphiphiles, membranes, micelles, emulsions, dendrimers,
liquid crystals, polyelectrolytes, and their mixtures. Soft matter systems usually
have structural length scales in the region from a nanometer to several hundred
nanometers and thus fall within the domain of “nanotechnology.” The soft matter
length scales are often characterized by interactions that are of the order of
thermal energies so that relatively small perturbations can cause dramatic structural
changes in them.
Polymer blends containing nylon-6 and polypropylene (PP) were prepared by using a single screw extruder. Three different types of maleic anhydride modified PP (PPMA06, PPMA1and PPMA05) were used as compabilizers to examine their effects. The properties included tensile strength, Izod impact strength, torque rheometry and extent of water absorption of the resulting blends were measured and the morphology was characterized by using scanning electron microscope (SEM). The crystallization behavior of blends was analyzed by monitoring differential scanning calorimetry (DSC), X-ray diffraction.
Proteins are polymers composed of hundreds or even thousands of amino acids linked in series by peptide bonds. What structural forms do these polypeptide chains assume, how can the sequence of amino acids in a protein be determined, and what are the biological roles played by proteins?
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Beyond platinum: synthesis, characterization, and in vitro toxicity of Cu(II)-releasing polymer nanoparticles for potential use as a drug delivery vector
Polyurethanes are block copolymers composed of alternating short hard segments
and long flexible soft segments that are thermodynamically incompatible at the
temperature of use [1,2]. Phase separation of segmented polyurethanes (SPU) with a
limited hard segment content results in hard segment rich domains dispersed in a
continuous matrix of the soft segments . The hard domains act as physical crosslink
providing the polymer with mechanical strength while the soft matrix contributes to
the elastomeric properties [4,5]....
The general review of influence of the pollutants on polymers has been presented by
Jellinek et al. . Therein the characterization of reactivity of polymeric materials toward
aggressive gases is given. The various polymers were used as films of 20 μ thickness. The
thickness is enough small to exclude in most cases the diffusion as the determining factor of
the pollutant action. The films were investigated under different conditions: 1) the pollutant
action; 2) the oxygen action; 3) UV light action; 4) UV light and oxygen; 5) UV light, oxygen