摘要:The recent development in the research of polyether prepared with ionic polymerization catalysts and double metal cyanide catalysts are reviewed briefly and in detailed, respectively.The structural change, novel synthesis technique of the double metal cyanide catalysts are also summarized.The research trend in the area is predicted.
关键词:polyether;Double metal cyanide catalyst;Epoxide;Synthesis
摘要:Keeping the dispersion state of inorganic nanoparticles in their primary dimension in the polymer base is the key problem in the preparation of polymer-based nanocomposites.In this series of two reviews, the combination form between inorganic nanoparticles and polymer base and preparation method of polymerbased nanocomposites are sorted.The fundamental principle and key techniques of direct dispersion method and simultaneous formation method are discussed in this review.
摘要:The recent progress and situation of study on the toughening mechanism of polymer toughened by rubber have been reviewed in this paper;especially the quantitative investigation on the brittle-ductile transition of polymer/rubber blends has been emphasized.Also the influences of the morphology parameters of rubber particles, the compatibility of the interface between the rubber particles and polymer matrix, the testing conditions of toughness and the properties of rubber and matrix on the toughness and toughening mechanism of rubber toughened polymers have been discussed in detail.Finally, the trends of toughening of polymer by rubber in the future have been suggested.
摘要:The application of light scattering on the study of macromolecular solutions and gels in recent more than ten years was summarized extensively.The topics focused on the study of formation and structure of macromolecules in solutions and particles of gels and microgels.The span processes of gelation, microemulsion polymerization and the macromolecular associations can also be investigated by combination of static and dynamic light scattering.The composition and operation of light scattering equipment and the developing history and fundamentals of light scattering was introduced compendiously.
摘要:The major aspects of the theoretical study on use of polysilsesquioxanes as precursors to silicon oxy carbide ceramics through pyrolysis at elevated temperatures in inert atmospheres and a variety of applications, including matrices, infiltrates and coatings in ceramic matrix composites, were reviewed in this paper. Several methods of pyrolysis have been mentioned.The conversion of silsesquioxanes to silicon oxy carbide ceramics, the pyrolysis mechanism and the final products were discussed.Its coming developments are given.
摘要:The applications of functional polymer materials as carriers (such as:biosensor, latex, magnetic particles and gel) in detection and diagnosis are reviewed.The prospects are also presented.
摘要:In this present paper, the development of polyelectrolyte pervaporation membranes was reviewed.Definitions, characters, and preparations of polyelectrolyte and polyelectrolyte complex were covered. Preparations and separation performances of some important polyelectrolyte membranes developed in recent years were introduced in more details.
关键词:Polyelectrolyte;Polyelectrolyte complex;Pervaporation;Membrane material
摘要:In this paper, biosynthesis technology was introduced briefly.The application of biotechnology in the field of polymer materials was illustrated in detail.In addition, the prospect on the development of this new technology was also discussed.
摘要:Photonic crystal is a new concept and a class of new material noticed in recent decade.A brief description of unique features of photonic crystal is given in this paper.The fabrication of photonic crystals are described, especially the polymer photonic crystals.
关键词:Photonic crystal;Periodic structure;Dielectric material;Photonic band gap
摘要:Polyimide fibers possess many advantageous properties, e.g., high strength, high modulus, heat resistance, radiation resistance, etc..In this article, the preparation of polyimide fibers by wetspinning technology including one-step and two-step process and fusible-spinning technology and the properties of the fibers are reviewed.
摘要:When teaching course of "The Structure and properties of Polymers" , it is important to lay stress on the characteristics of polymers.The paper presents much discussion on characteristics of polymers, such as flexibility of macromolecular chain, unique entropy elasticity and notable viscoelasticity of polymer materials, peculiar WLF equation, possible orientation of large scale motion unit and dis-orientation of small scale motion unit, crazing, single-chain condensed state, folded lamellar crystals and macroscopic single polymer crystals with stretched chain, multi-distribution of molecular weight, properties of polymer solution and elasticity of polymer melts.
关键词:Polymer;The structure and properties;Flexibility;Chain segment motions.