最新刊期
卷 0 ， 期 0 ， 2020
- 摘要：The progress,the key issues and the trends in the fields of polymer for energy conversion and storage,polymer with catalysis functionality and the polymer synthesis based on carbon dioxide or carbon mono-oxide are mainly summarized.关键词：Optical electrical active polymers;Energy storage polymers;Covalent porous polymers;Polymer catalysis;Polymer synthesis based on carbon-oxide chemistry
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发布时间：2022-09-18 - 摘要：Advanced high temperature polyimide matrix resin and its carbon fiber reinforced composites,high temperature polyimide super engineering plastics and high performance polyimide films were investigated. The matrix resins include the first generation resin with service temperature of 316℃,the second generation with service temperature of 371℃,and the third generation with service temperature of 426℃. High temperature polyimide super engineering plastics include reactive hot press molding polyimide plastics and high temperature injection molding plastics. High performance polyimide films comprise transparent polyimide film and atomic oxygen resistance polyimide film. The structure,process and performance were discussed,their application in aerospace, aviation, microelectronics and other fields were also presented.关键词：High temperature polyimide resin;Composites;Engineering plastics;Film
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发布时间：2022-09-18 - 摘要：Due to the unique double-or multiple-chain structure,Ladder-like polysiloxanes (R-LPSs) have shown much higher resistance to heat,oxidation and radiation than the corresponding single-chain polysiloxanes. Since the first report in 1960s by Brown,R-LPS has attracted a lot of attention worldwidely,and great efforts have been made in synthesis novel R- LPS and enhance the regularity of the ladder structures since then. With the deepening understanding of the no chemical bonded inter-molecular interaction, the synthesis mechanism of R-LPS has also been further developed. It involves broad theoretical and experimental research in polymer frontiers,such as supramolecular assistant synthesis method,ladder macromolecular formation mechanism,nanostructure and material properties characterization, etc. This paper first gives an overall introduction of R-LPSs,and then reviews the most recent progress in this field. Especially,this paper reviews the publications on the synthesis of R-LPS based on the "super-molecular coupling and the gradually build-up polymerization". The R-LPSs in this review are generally classified based on structure of the main chain as three categories : Radical-sided double-chain-bonded ladder polysiloxane (R-DLPS),Radical-sided triple-chain-bonded organo-bridged ladder polysiloxane (R-TLPS) and Radical-sided quadruple-chain-bonded ladder polysiloxane (R-QLPS). Synthesis and characterization of R- LPSs with different side groups are demonstrated. The cited papers are mostly published in the nearest five years.关键词：Ladder-like polysiloxane;Supramolecular templated synthesis;Gradual coupling polymerization
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发布时间：2022-09-18 - 摘要：Phenolic resins are a kind of widely used thermosets due to their advantages,such as low cost,easy availability of raw materials,easy processing and excellent comprehensive performance. The application of phenolic resins has stepped out of the scope of universal resins. The high performance and functionalization have presently become the main developing trend,especially environmental friendliness. This review summarizes the latest progresses on phenolic resins, including new synthetic and curing methods,such as ionic liquids, phase separation and Stober method, which has unique advantages compared with the conventional methods. This paper also reviews biomass-based phenolic resin modified by lignin,tannins and bio-oil, as well as the physical, chemical and biological methods for phenolic resin recycling.关键词：Phenolic resin;New preparation method;Biomass;Recyclization
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发布时间：2022-09-18 - 摘要：Fluorinated polymers exhibit excellent and unique properties and are mostly synthesized via radical polymerization of fluoroalkenes. Significant progresses have been achieved in living/controlled radical polymerization since 1990s. Several strategies for living/controlled radical polymerization have been developed and become powerful tools for precise design and synthesis of well-defined polymers. The living/controlled radical polymerization of fluoroalkenes was pioneered in the late 1970s,and the iodine transfer polymerization of fluoroalkenes was successfully used for commercial preparation of thermoplastic elastomers. The living/controlled radical polymerizations of fluoroalkenes reported in literatures include iodine transfer polymerization (ITP),atom radical transfer polymerization (ATRP),organic borinates and reversible addition-fragmentation chain transfer polymerization (RAFT)/interchange of xanthates (MADIX). Based on these polymerizations, the well-defined fluorinated polymers have been prepared with controlled molecular weight and various architectures,such as telechelic,block and graft copolymers. This paper summarized recent progresses in living/ controlled radical polymerization of fluoroalkenes, including our lab's achievements.关键词：Fluoroalkenes;Fluoropolymer;Living polymerization;Controlled polymerization
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发布时间：2022-09-18 - 摘要：Bridged polysilsesquioxanes is a widely used organic-inorganic hybrid material. This material has a three- dimensional net-like structure,which makes the material achieve the mixture of the inorganic phase and the organic phase in the molecular level. Its properties are the combination of the two-phase nature. We can gain varieties of bridged polysilsesquioxanes with different properties by changing the type of organic phase. In this paper,we introduce the bridged polysilsesquioxanes xerogel and aerogel from the view of molecular structure,synthetic methods,representative materials and typical applications. In addition,we also introduce the history,the monomer structure and the application of a special bridged polysilsesquioxane material with periodic mesoporous structure.关键词：Bridged polysilsesquioxanes;Gel;Structure;Synthesis;Application;Mesoporous
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发布时间：2022-09-18 - 摘要：In the field of bulk-heteroj unction organic photovoltaics (BHJ OPVs),fullerenes and their derivatives are an important class of n-type electron acceptor materials. Nevertheless,they suffer from some disadvantages,such as weak absorption in the visible spectral region, limited spectral breadth,difficulty in variably tuning the band gap,and poor solubility, which severely limit the fullerene-based materials as an acceptor material more widely used in organic solar cells. Compared to the fullerene derivatives,non-fullerene organic small molecular acceptors (OSMAs) are much easier to be synthesized and purified with lower processing costs and more excellent solubility, and their band gaps could be finely adjusted by proper molecular design. Recent reports on OSMAs show great improvement and the power conversion efficiency has exceeded 4%. This article reviews recent developments in several classes of solution-processable non-fullerene acceptors for BHJ OPVs. Finally,critical challenges that determine photovoltaic performance and prospects for future directions are discussed.关键词：n-Type non-fullerene small-molecular acceptor;Solution processing;Bulk-heteroj unction;Organic photovoltaics
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发布时间：2022-09-18 - 摘要：A review. Conductive polymers have been become new microwave absorbing materials for their low density, varied structure and adjustable electromagnetic parameters. To improve its absorbing properties, a lot of research has been carried out on micro-and macro-structural design. It has been found that conductive polymers and their metal complexes have good microwave absorbing properties,which would be significantly enhanced through micro-structure control such as with nanometer size,nano-fiber morphology or with chirality. Composited to a binary or multi-component system and constructed to multi-layered system or metamaterial structure can result in more excellent absorbing properties. In this paper, the microwave absorbing materials containing conductive polymers are reviewed,some recent results are brief introduced and the development of polymeric materials in microwave absorbing field is prospected.关键词：Conductive polymer;Microwave absorbing material;Composite;Structure design
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发布时间：2022-09-18 - 摘要：The light-induced shape-memory polymers are one kind of new materials that show shape-memory effects if they can be deformed and fixed into a temporary shape by light,and recover their original,permanent shape only on exposure to another light with different wavelength,thereby complete their memory". These materials have their unique properties such as non-contact,instantaneity,localized effect and cleanness,which have attracted increasing more and more attention to scientists worldwide. This paper presents a brief review of current progress in the area of light activated shape- memory polymers and shape-changing polymers which are mainly involved in photochemical reaction types such as having cinnamic groups and azobeneze group. Their category, unique advantage, potential application and memory working mechanism are described. Problems to be solved and future development are discussed and in addition,the application trends are prospected.关键词：Shape memory;Shape-changing;Light-induced;Polymers
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发布时间：2022-09-18 - 摘要：Parylene films,which are made by vacuum vapor deposition and polymerization and have some excellent properties, was first developed industrially by Union Carbide Corporation in mid-1960s. Parylene films have become a new type of material for rubber surface modification,e. g.,for the improvement of mechanical properties, chemical and oil resistance,barrier properties,surface friction and lubrication properties, electrical insulation and voltage resistance,and biocompatibility of rubber products. Based on the authors'working experience,the preparation method,the properties and the applications of the parylene films in rubber products such as silicone rubber keypads,rubber seal rings,inner liners and inner tubes,medical rubber products and micro electro mechanical systems were reviewed in this paper. The research and application prospects of parylene films were also briefly discussed.关键词：Parylene;Silicone Rubber;Keypads;Rubber seal rings;Rubber stoppers
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发布时间：2022-09-18 - 摘要：Polymer microspheres with different morphology and structure have various physico-chemical properties and functions. The design, synthesis and characterization of the functional polymer microspheres is briefly introduced. This paper summarizes the research progress on design,synthesis,characterization and application of the functional polymer microspheres incorporated proton exchange membrane for fuel cell. The resultant composite proton exchange membranes exhibit high proton conductivity,good methanol barrier property due to their high uptake and good water retention under low humidity.关键词：Functional polymer microsphere;Proton exchange membrane;Composite membrane;Water-retention;Proton conductivity
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发布时间：2022-09-18 - 摘要：Natural fatty alcohols were ethoxylated to synthesize fatty alcohol polyoxyethylene ethers in the presence of the catalyst prepared in our lab and the ethoxymer distributions were analyzed by gas chromatogram. The experimental results indicated that the ethoxylated oligomers showed very narrow distribution in the presence of the catalyst. In the case of average adduct number of ethylene oxide 1. 6,the reaction pressure 0. 1~0. 3MPa,the reaction temperature 120℃, the mixed fatty alcohol polyoxyethylene ether with only 15. 5 % of the free alcohol and 76. 2% of the main oligomers AEO1-3 was obtained.关键词：Fatty alcohol;Ethoxylation;Fatty alcohol polyoxyethylene ether
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发布时间：2022-09-18 - 摘要：Through regulating the content and proportion of biphenyl carbonyl and unsymmetrical biphenyl segments in polyimide resin backbone,polyimide precursor solid resins with different carbonyl content were prepared. These precursor resins have good meltability,when heated to 320~330℃, PI resin completely melted, resulting in low melt viscosity resin, as the temperature increased further,the melt viscosity increases rapidly due to the crosslinking reaction. The precursor resins were heated and foamed,forming the thermosetting rigid closed-cell PI foams which have high closed-cell rate (>86%) and high thermal properties (Tg>353℃, T10>519℃) . The study found that the introduction of the biphenyl carbonyl segment into the PI resin main chain could obviously improve the PI foam toughness without sacrificing its mechanical strength and modulus.关键词：Polyimide;Rigid closed-cell foams;Copolymerization;Heat resistance;Mechanical property
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发布时间：2022-09-18 - 摘要：Owing to their unique physicochemical properties endowed by the micro/nano structure, polyimide microspheres attracted many attentions. Polyimide microspheres were fabricated via phase inversion emulsification method. The polyimide microspheres prepared by this way were mono-dispersed. PI with hydrophobic group in the molecular structure could be fabricated into microspheres in the microstructure successfully. Stirring rates and emulsion concentrations influenced polyimide microspheres morphology and particle distribution severely.关键词：Polyimide;Microspheres;Mono-dispersed
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发布时间：2022-09-18 - 摘要：Long glass fiber reinforced polypropylene composites are usually called as thermoplastic glass fiber reinforced plastics. It has become an good candidate for common thermoset glass fiber reinforced plastics due to excellent mechanical property,easily controllable processing approach and recyclability. Long glass fiber reinforced polypropylene composites were fabricated through injection molding by adding the compatilizer and other additives. The aim is to achieve a kind of friendly-environmental recyclable composites,meeting the requirement of environmental protection. The tensile and bending properties of the composites were evaluated on the universal tensile machine to prove the enhancement effect of long glass fiber polypropylene particles. The results indicated that long glass fiber can be compatible with polypropylene very well, which affords a uniform distribution inside the polymer matrix for effective reinforcement effect.关键词：Long glass fiber reinforced polypropylene particle;Compatilizer;Friendly-environmental composite
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发布时间：2022-09-18 - 摘要：In this paper, molecular docking, the experiment and molecular simulation were connected to compare the degradation of immobilized onion Pseudomonas lipase (Pseudomonas cepacia lipase (PC)) for poly(butylene succinate) (PBS) based copolymers in chloroform organic phase and water phase. The copolymers were modified by adding 1,4- cyclohexanedimethanol(CHDM) and 1,4-Cyclohexanedicarboxylic acid (CHDA) with six-member ring structure and diethylene glycol (DEG) and ethanol acid (DGA) with ether bond structure. The binding mechanism and degradation diversity for PC lipase and the substrate were illustrated. The results showed that the PBS based copolymers were catalyzed degradation by PC lipase. The free binding energy order for PC and substrate in chloroform was CMSCM>DGSDG>BDAB>BCAB>BSB, and the order in water was CMSCM>DGSDG>BCAB>BDAB>BSB. The binding energy of CM unit was highest. The enrichment of methylene in CM unit made the most stable docking for substrate and active site of PC. Then PBS-co-CHDMS displayed the largest degradation rate. Due to the influence of the solvent effect, the combination for enzyme and substrate kept more stable in chloroform than in water. As a result,the catalytic degradation rate in chloroform was greater than it in water.关键词：Pseudomonas cepacia lipase;PBS based copolymers;Enzymatic degradation;Solvent effect;Molecular simulation
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发布时间：2022-09-18 - 摘要：A reactive macromonomer was synthesized by using PPG-400 and maleic anhydride as raw materials,then polymer polyols were synthesized in the presence of the synthesized reactive macromononer,GP-330 as basic polyether, styrene and acrylonitrile as monomers, AIBME as initiator,isopropyl alcohol and 1-dodecanethiol as a chain transfer agent. The optimal conditions of synthesizing polymer polyols were investigated and the obtained products were characterized by MS,GPC,DSC,polarization microscopy,and laser particle size analyzer.关键词：Reactive macromonomer;AIBME;Synthesis;Characterization
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发布时间：2022-09-18 - 摘要：The present paper reports the controlled polyemrization of MASI using CuCl/N-benzyl-2-pyridylmethanimine (NBPM)/ethyl 2-bromoisobutyrate (EBrIB) as initiator. Poly(MASI) of narrow PDI (~1. 10) and high molecular weight with monomer conversion up to 90% were obtained. The end groups of the polymer remained active throughout the polymerization due to stronger carbon-chlorine bond. Thus, well-defined P(MASI35-b-DMAEMA52) and P(DMAEMA40-b- MASI16) block copolymers were obtained. P (DMAEMA40-b-MASI16 ) with shorter MASI segments showed water solubility,which self-assembled into uniform micelles with core-shell structure.关键词：Poly (N-hydroxysuccinimide methacrylate);N-benzyl-2-pyridylmethanimine;ATRP;2-(Dimethylamino) ethyl methacrylate
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发布时间：2022-09-18 - 摘要：A well-defined block copolymer of poly(DMAEMA-b-TMS) was synthesized via ATRP. The obtained poly (DMAEMA-b-TMS) could be self-assembled into vesicles in methanol/water mixture. In addition, the structure of the vesicles was fixed through the crosslinking via polycondensation through the hydrolysis of -Si(OCH3)3 groups. The vesicles were characterized by laser light scattering studies and by SEM and TEM analysis. The vesicles are thermo-and pH-sensitive. The solid vesicle particles can easily be redissolved and reprecipitated by manipulating the temperature or pH of the solution and the process is fully reversible.关键词：3-(Trimethoxysilyl)propyl methacrylate;2-(Dimethylamino)ethyl Methacrylate;Block copolymer;Stimuli- responsive;Organic/inorganic hybrid vesicle
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发布时间：2022-09-18
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