最新刊期
卷 25 ， 期 2 ， 2012
- 摘要：The research results of prospective explosives with high energy and low sensitivity are introduced. The property and application situation of the exiting and newly synthesized explosives, with decreacd sensitivity are summarized.关键词：High energy;Low sensitivity;Explosive
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发布时间：2022-09-18 - 摘要：Carbon nanotubes and carbon fibers both possess excellent mechanical properties, electrical properties and some other good properties. They have been widely used as reinforcements for the composite materials. However, carbon nanotubes/carbon fiber/epoxy resin composites have some limitations at present. Researches only consider the interaction between two-phase materials, in other words, only consider treatment of a single phase while ignoring the modification of the other phase. This paper firstly overviews research progress about carbon nanotubes/ carbon fiber reinforced epoxy composites, and then research progress of carbon nanotubes/carbon fiber/epoxy three-phase composites is described while combining with our own research results. It can be seen that the performance of the carbon nanotube/carbon fiber/epoxy resin three-phase composite will have greatly improved if making a full and effective linkage between three-phase materials, and making good use of their synergy effects.关键词：Carbon nanotubes;Carbon fibers;Epoxy resin;Three-phase composites
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发布时间：2022-09-18 - 摘要：The crosslinking of polymer chains is of primary importance in controlling many polymer properties. Large increases in the degree of crosslinking make amorphous polymers more rigid and cause them to have higher softening points and a higher modulus.The properties of polyurethane are influenced by the method of crosslink, the structure of crosslink agent and the crosslink density. Therefore, it is very important to research the way of crosslink, the measurement of crosslink density and the relationship between the property and crosslink density of polyurethane. In this paper, several two-step methods based on linear prepolymer to prepare crosslinked polyurethane are reviewed, after that the common used methods to determinate the crosslink density are summarized. Furthermore, the works about the effects of crosslink density on the properties of polyurethane network are introduced as well.关键词：Polyurethane;Post-crosslink;Crosslink density
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发布时间：2022-09-18 - 摘要：Bio-based polymers derived from renewable resource. It has considerable economical and environmental value. Both tung oil and rosin are important renewable resources in our country. In the times of converting biomass into chemical raw materials due to the environmental pollution and diminishing petroleum oil reserves, they have been widely used in polymeric materials synthesis and modification. The research on bio-based thermosetting resin has considerable value and bright future. In this paper, the research status of tung oil and rosin being used to synthesize bio-based epoxy or curing agents was reviewed.关键词：Tung oil;Rosin;Bio-based epoxy;Epoxy curing agent
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发布时间：2022-09-18 - 摘要：The research progress of the stimulus-responsive polymer brushes was summarized in this article. The classification, the way to connect with the substrate and the conventional preparation of the polymer brushes were discussed. The ionic strength-responsive, temperature-responsive, pH-responsive, light-responsive and solvent-responsive polymer brushes and their current research progress were introduced in details, and the corresponding stimulus-responsive mechanism was also discussed. The design and preparation procedure of the multiple stimulus-responsive polymer brushes and their multiple stimulus-responsive properties were summarized. The bending behavior of the substrate resulting from polymer bushes responding to the external stimulus was discussed, and the 3D controllable self-assembling behavior by the bending was presented. The future of the stimulus-responsive polymer bushes was also prospected in this article.关键词：Stimulus responsive;Smart materials;Polymer brushes
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发布时间：2022-09-18 - 摘要：Most of the polymer-supported noble metal catalysts had high optical catalytic activity.Furthermore,they were separated readily from products after reaction and could be reused several times without any remarkable loss in optical catalytic activity,which became an important researching issue.The general polymeric supports included organic polymers and inorganic-organic hybrid composites.According to the type of polymeric support,the syntheses and applications in the hydrogenation of alkylenes,dienes,alkynes and nitroaromatics,etc.,of polymer-supported noble metal catalysts as Pt,Pd and Rh were summarized in this paper.The research on dendrimer-supported catalyst,multiple-metal-loaded catalyst and nano-gold-loaded catalyst was also generalized and commented.关键词：Polymer-supported catalyst;Noble metal;Synthesis;Hydrogenation reaction
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发布时间：2022-09-18 - 摘要：The organic-inorganic nanocomposite films were fabricated by the polystyrene (PS) grafting onto the vinyltriethoxysilane modified titanium oxide nanopowders using free radical polymerization. The morphology of the films and the structure of the PS grafted titanium oxide (PS-g-TiO2) were examined by Field Emission Scanning Electron Microscope and Fourier transform infrared spectroscopy. The wetting properties of the vinyltriethoxysilane (VTEOS) modified titania nanopowders were investigated. The superhydrophobic VTEOS modified and PS-g-TiO2 films show the maximum static water contact angle of 160° and 154°, and minimum sliding angle of 3° and 4°, respectively.关键词：Superhydrophobic;Titanium oxide nanoparticles;Polystyrene;Organic-inorganic nanocomposites
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发布时间：2022-09-18 - 摘要：Five kinds of PAN with different molecular weight were polymerized via DMSO/H2O mixed solvent method, and the PAN was dissolved into the spinning solution with DMF as solvent and electrospun into UFFMs. The polymerization results showed that viscosity average molecular weight and conversion rate of PAN would increase with higher H2O ratio in mixed solvent at the same monomer concentration and environment conditions. From the TG analysis, dramatic weight loss zone would appear and the weight loss ratio would larger with PAN molecular weight increasing. Electrospinning results showed that the spinning solution could not be electrospun into ultra-fine fiber if the molecular weight of PAN was too high, and the higher electrospinning voltage was favorable for finer fiber diameter but cause larger dispersion of fiber diameter distribution with the electrospinning stability decreasing.关键词：Polyacrylonitrile;Electrospinning;Ultra-Fine Fiber Mat;DMSO/H2O;Polymerization
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发布时间：2022-09-18 - 摘要：The objective of this work was to study the adsorption performances for theophylline onto the p-acetaminophen resin(GQ-01 resin) with two kinds of the hydrogen bond site of acetamino group and hydroxyl group. The GQ-01 resin modified with p-acetaminophen was synthesized with chloromethylated polystyrene and p-acetaminophen by Friedel-Crafts reaction. The results showed that the adsorption property of theophylline onto GQ-01 resin was 1.9 times that of XAD-4. Heat was discharged during the adsorption and the adsorption occurred automatically. The adsorption kinetic date of theophylline fitted to the Lagergren first order rate equation. The intrapartical diffusion of theophylline was the main rate-controlling step. The adsorption kinetic date could be described by HSDM model. The saturated adsorption quantity of theophylline was up to 102.13mg·mL-1 according to the dynamic adsorption and desorption experiments at 298 K. The resin could be regenerated by 80% ethanol and 1 mol/L HCl.关键词：P-acetaminophen resin;Theophylline;Adsorption
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发布时间：2022-09-18 - 摘要：Silicones and sugar were adopted to modified phenol-formaldehyde resin to increase the flexibility of adhesive film with high intensity of glue. The species, mass of inclusion, time of inclusion of modifier was examined .It shown that the phenol-formaldehyde resin adhesive was prepared by the way that the organic silicon(8427) was 1.5% in total mass and sugar was 1.5% in total mass were joined in 45℃.Which the free formaldehyde content in resin was lower then 0.067%, strength of tensile shear was over 6MPa. The structure and functional were characterized by FT-IR and TG. It was shown that lots of —Si—O— were formed, the strength of tensile and thermal resistance were increased in a much degree.关键词：Phenol-formaldehyde resin;Composite modify;Organic silicon;Sugar
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发布时间：2022-09-18 - 摘要：Natural rubber (NR) is an obvious renewable raw material synthesized by Hevea brasiliensis. Compared with synthetic rubbers, NR can better meet the nowadays sustainable development. The process of epoxidation modification of NR is a simple and economic way. The reaction can be carried out in the water phase. ENR poses excellent properties such as good compatibility, wet skid resistance, low rolling resistance, oil resistance and air tightness, etc. has great applied potential in tyre industry,adhesives and navel composites. The present paper reviews the recent progresses in the preparation and characterization of ENR Including its vulcanization, Silica reinforcement and its application in the tire industry. Meanwhile, the future research focuses of ENR are indentified.关键词：Epoxidized natural rubber;Preparation;Characterization;Silica Reinforcement;Vulcanization;Application
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发布时间：2022-09-18 - 摘要：Polyborosiloxanes with superior performance and wide application prospects have been extensively explored as a kind of novel organic resin materials of modified polysiloxanes. Polyborosiloxanes have better high temperature resistance and adhesive than general polysiloxanes because of introducing boron. In this paper, several methods in recent decades have been simply described for the synthesis of polyborosiloxanes. The performances and applications of polyborosiloxanes as precursor for Si—B—C—O ceramic materials, adhesive, flame retardant, coating with high temperature resistance, have also been summarized.关键词：Polyborosiloxanes;Synthesis;Application
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发布时间：2022-09-18 - 摘要：By using comparative teaching method,several groups of interesting but confusable polymer-related organic compounds,including ammonia/ammonium/amine,amide/imide,cyanogen/nitrile,ester/fat,and wax/paraffin wax/paraffin oil,were analyzed,distinguished,appreciated,and summarized,so as to help the beginners to discriminate and understand their characteristics.关键词：Polymer chemistry;Organic chemistry;Comparative teaching
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发布时间：2022-09-18 - 摘要：Condensation polymerization is one of the most important methods employed to synthesize polymers.The simplest case of condensation polymerization is linear condensation polymerization,which can be categorized into two types and involves the reaction between monomers,or pair monomers,bearing two condensable functional groups.This reaction system has been systematically studied with statistical method by Flory in the 1940s and,under the postulate of equal reactivity of all functional groups,the famous Flory Distribution Functions were derived.These functions revealed the relationship between the properties of reaction system such as number-average degree of polymerization
, the weight-average degree of polymerization and molecular weight distributions and the extent of reaction p.In this article,under the postulate of equal reactivity of all functional groups,the processes of two types of linear condensation polymerizations were modeled by computer programming.The result gained agreed with that of Flory’s statistical method.Our method rendered a comparably more vivid picture of the whole process of real reaction and had the potential to be expanded to simulate the real viscous polymerization and to study the kinetics of the reaction system. 关键词：Linear Condensation Polymerization;Computer Modeling;Flory Distribution Functions- 2
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发布时间：2022-09-18 - 摘要：The particularity of polymer lies in its long chain structures,special long chain structures lead to special motion principle.Definition of "polymer physics" is moving polymer and motion of polymer and polymer material,More specifically,"polymer physics" is a kind of course on long chain structure,long chain structure evolution and the motion principle of long chain structure on various moving units of polymer.So the main content of "polymer physics" is on structure and motion of polymer.Aiming at the teaching task and characteristics at the stage of undergraduate,the suggestions and ideas on the content and arrangement of the chapters of current textbooks of Polymer Physics were put forward.关键词：Polymer physics;Structure and motion;Teaching content
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发布时间：2022-09-18
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