摘要:Research on the structure, morphology and properties of polymer employing high pressure method is a frontier project in polymer science. According to our studies carried out recently, in this paper, studies on high pressure crystallization behaviors of PET especially the influence of temperature, pressure, time and molecular weight on it, its morphology and the mechanism about its extended-chain crystals formation were illustrated in detail. Other high pressure behaviors about aromatic polyesters such as PBT and PEN were also discussed briefly. Prospects of research were also introduced. The progress made in this field was reflected in this paper.
摘要:In this article, we reviewed the basic synthesis methods of conducting polymer microtubes/nanotubes; the factors which effect the formation of the conducting polymer microtubes/nanotubes were detailedly analysized; the properties and effect factors of conducting polymer microtubes/nanotubes were discussed briefly.
摘要:The preparation of organic-inorganic hybrid materials comprising of the entirely new silsesquioxane-based polymers were described. Polyhedral oligomeric silsesquioxane (POSS) -based hybrid materials have excellent properties for the molecule hybrid system based on the chemical bonding. The structure and the preparation as well as the properties of the POSS-based polymers were discussed in this article.
摘要:In this paper, research progress of functional organic polysiloxane in recent ten years was summarized. The physical and chemical properties, structure, synthesis of organic polysiloxane containing epoxy, vinyl, amino and block polysiloxane were reviewed.
摘要:Microwave irradiation is used in the polymerization as a novel and effective way of heating. Microwave irradiation, which is compared with the traditional heating method, has the advantages of short time, low energy consumptions and high product yield. In recent years, applications of microwave irradiation in many chemical fields have been reported. This paper reviews that microwave irradiation has been applied in polymerization including emulsion polymerization, solution polymerization and bulk polymerization. The differences between the microwave irradiation polymerization and the normal heated polymerization have been discussed.
摘要:The development of functional polyolefin by direct copolymerization of olefin and polar monomer was summarized from the view of progress on olefin coordination polymerization catalyst. The emphasis was focused on the effects of catalysts structures, reaction between catalysts and cocatalysts, interactions between catalyst systems and the polar groups of the monomers on the direct copolymerization.
摘要:Advance in the vinyl polymerization of norbornene with late transition metal catalysts has been reviewed. In this paper, the structures of three kinds of late transition metal catalysts including Ni, Pd, Co and their characters of vinyl polymerization of norbornene have been introduced, and mechanism of vinyl polymerization of norbornene with Ni and Pd catalysts has been discussed.
摘要:The principle and some features of atomic force microscopy (AFM) are briefly reviewed. And advances in study on the structure of polysaccharide, especially starch by AFM are presented.
关键词:Atomic force microscopy (AFM);Single-molecule force spectroscopy;Polysaccharide;Starch
摘要:There exist unavoidable drawbacks in the common methods to explore the phase behavior of multi-component polymer systems. Instead, the dynamic rheology research in this field has unique advantages over those methods. This methodology is theoretically based on the fact that, for the multi-component polymer systems exhibiting critical phase behavior (LCST, UCST) or micro-phase separation, their dynamic rheological response under the small strain confition is very sensitive to the formation and evolution of the morphology and structure during the phase separation process, and the presence of the heterogeneous structure leads to the different viscoelastic relaxation behavior from the corresponding homogeneous counterparts in the long time relaxation region. That is, it deviates from the classical linear viscoelastic theoretical models by the enhanced elasticity, much longer relaxation time and breakdown of time-temperature superposition principle (TTS) . The advances in studies on the phase behavior of multi-component polymer systems by such dynamic rheology methods as Hah plot, Cole-Cole plot, breakdown of TTS and G′~ Tplot were reviewed in this paper.
关键词:Multi-component polymer systems;Phase behavior;Long time relaxation region;Dynamic rheological behavior
摘要:Phospholipid Polymers are a family of biomimetic materials and proved to be biocompatible, specifically blood-compatible. Based on their chemical compositions and microstructures, this article provides an overview of development and biomedical applications of phospholopid polymers.
摘要:A research on developments of the synthesis, liquid crystalline (LC) behavior and potential applications of several types of metallomesogenic polymers is provided based on the latest literatures. It is pointed out that four techniques such as direct coordination, monomer coordination, cross-linking coordination and polymer reaction are served for the synthesis of the metallomesogenic polymers. Metallomesongenic polymers are usually thermotropic and exhibit stable nematic or smectic LC phase. Some metallomesogenic polymers show enantiotropic smectic C and smectic A phases, and some are monotropic. Metallomesogenic polymers have special properties like metals. They are magnetically, electronically, optically conducting materials with high performance. These polymers could be potentially served as LC display materials, magnetic data-storage film materials, lubricant as well as anisotropic catalyst.
摘要:Poly (amide amine) dendrimer is a new class of macromolecule that emanates from a centeral core and has a defined number of generation and functional terminal groups. This polymer may be widely applied in catalyst, medicine, bionomy and industry in view of its high symmetry, a great number of terminal groups and interior cavity. After providing its synthesis, characterization and structure performance, this paper covers the modifications and applications of poly (amide amine) dendrimer.
摘要:The preparations, characteristics, applications and developments of polymer supports for solidphase synthesis and combinatorial chemistry are reviewed. PS-DVB resins, polyacrylamide resins and TentaGel resins are emphasized and some novel PS resins including resins modified by PEG derivative cross-linkers and by PTHF derivative cross-linkers are recommended, also nonaromatic POEPOP and SPOCC resins.
摘要:The composite, preparation and performance of waterborne two-package polyurethane coatings for automotive refinishing were reviewed. It indicated that properties of this type of coatings match that of traditional solvent-based polyurethane coatings. And they will replace the solvent-based coatings for automotive refinishing in near future.