最新刊期
卷 0 ， 期 0 ， 2020
- 摘要：Biodegradable polymer has been widely paid attentions based on it became an important bio-medical material. And aliphatic polyester has become greatly studied and widely applied biodegradable polymer because of its fine properties. Based on consulting of 78 references, the research works in Institute of Chemistry, CAS on bulk modification of aliphatic homo-polyesters, which aimed to improve disadvantages of the polymers on hydrophilicity, degradation rate and bio-compatibility etc were summarized and review ed. In the paper some new aliphatic polyesters, which produced by copolymerization modification and blending modification, and some new characters and performances of the modified aliphatic polyesters were reported. Therefore, after aliphatic polyester undergone bulk modification not only performances of the aliphatic polyester have enhanced, but also the number of aliphatic polyesters has increased. It is benefit to supply more biodegradable polymers for selection of various biomedical applications.关键词：Biomaterial;Biodeg radable polymer;Aliphatic polyester;Bulk modification;Degradation rate
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发布时间：2022-09-18 - 摘要：Micro/ nanostructures of conducting polymers not only have the metallic conductivity, and reversible chemical and electrochemical properties and physical properties upon a novel doping/dedoping process, while processing qualities of conventional polymers, but they also have characteristics of nano-materials in general that lead to a large variety of applications especially in light-emitting and electronic devices, chemical sensors, separation membranes, and antistatic coatings. Micro/nanostructured polyaniline (PANI) has attracted agreat deal of interest in recent years because of its low cost, ease of preparation, unique chemical and physical properties controlled by the oxidation and protonation state, and excellent environmental stability. Therefore, the controlled synthesis, multifunctional properties created by a cooperation effect and applications of PANI micro/ nanostructures has become one of the hot topics in the area of nano-materials. In the review, the latest advances of synthesis, properties, and applications of the PANI micro/nanostucutures and related materials are presented based of our research achievements of polyaniline micro/nanostructures self-assembled by a template-free method.关键词：Polyaniline;Micro/nanost ructures;Template;Template-free;Cooperation effect;Multifunction
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发布时间：2022-09-18 - 摘要：Polymer solar cells (PSCs)are composed of a blend film (active layer) of a conjugated polymer donor and a fullerene derivative acceptor sandwiched between a transparent ITO positive electrode and a low workfunction metal negative electrode. PSCs have become the hot research field in recent years, due to their unique advantages of simple fabrication, low cost, light weight and capability to be fabricated into flexible devices. The present research focus is to improve their photovoltaic power conversion efficiency (PCE), and the key aspects for improving PCE are high efficiency photovoltaic materials. In this paper, I will mainly introduce the recent research progress of Institute of Chemistry, Chinese Academy of Sciences (ICCAS) on the new conjugated polymer donor and fullerene derivative photovoltaic materials, including the donor materials of two-dimensional conjugated polymers with conjugated side chains, conjugated polymers with electron-withdrawing substituents for lower HOMO energy levels, D-A copolymer with broad absorption and lower HOMO energy levels, and the acceptor materials of indene-C60 bisadduct (ICBA) and indene-C70 bisadduct. The highest PCE of the PSCs based on the conjugated polymer donor materials reached 7.59 %, which is one of the highest efficiencies reported in literatures so for. The PSCs based on P3HT as donor and our ICBA as acceptor showed PCE higher than 7%, which is the highest efficiency for the PSCs based on P3HT.关键词：Polymer solar cells;Conjugated polymer photovoltaic materials;Fullerene derivatives;Two-dimensional conjugated polymers;D-A copolymers
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发布时间：2022-09-18 - 摘要：Nanoscale functionalization for polymers is crucial to further understand essential correlation between polymer chain structure and macroscopic properties, which direct influence capability and trend to functionalize polymer materials. It is urgently required to further investigate physics and chemistry of the micro-process. Since2000, we have been focused on polymer composites micro-processing and physics and chemistry therein. Two representative macroscopic morphologies are mainly concerned: complex composite particles and nanoporous composite membrane. We have developed new template synthesis approaches to precisely control their macroscopic morphologies, meanwhile to assist a favorable growth and spatial distribution of desired components with soft matter (polymer gels or block copolymers) by specific interactions. The physics and chemistry during the micro-process has been elucidated.关键词：Polymer composites;Micro-process;Microstructure;Morphology
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发布时间：2022-09-18 - 摘要：Linear low density polyethylene (LLDPE) is an advanced resin within polyolefins, and has been one of the most demanding synthetic materials and fast industrialized in recent years. The development is relied on the pre-catalysts, in which titanium complexes have widely explored. In this feature article, the new progress and our contribution of titanium complex pre-catalysts is illustrated, and the correlations between complex structures and their catalytic performances are discussed.关键词：Titanium complex;Half-titanocene complex;Pre-catalyst;Ethylene polymerization;Ethylene Co-Polymerization
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发布时间：2022-09-18 - 摘要：Advanced polyimide materials have been extensively used in aerospace, aviation and microelectronic industries due to their outstanding thermal and cryogenic resistance, high mechanical and electrical insulating properties, and low dielectric constant and dissipation factor, etc. A review will be given in the progress of the high temperature polyimide materials developed in this Laboratory.关键词：Polyimide;Thermal resistance;Mechanical properties;Dielectrical Constant
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发布时间：2022-09-18 - 摘要：Aliphatic polycarbonates (APC) have attracted considerable attention as an important class of biodegradable polymers for their favorable biodegradability, biocompatibility and mechanical properties. APC are generally synthesized by the following four methods: (1) reaction of aliphatic diols with phosgene, (2) ring-opening polymerization of cyclic carbonates, (3) polymerization of epoxides with carbon dioxide, or(4) transesterification of dialkyl carbonates with aliphatic diols. Recently, there are lots of reports on synthesizing APC by methods(2) and(3), while there are not so many reports on method (4). This paper reviews the synthesis and application of APC, and the emphasis is placed on progress in synthesizing APC by transesterification.关键词：Aliphatic poly carbonate;Bio degradation;Synthetic method;Transesterification
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发布时间：2022-09-18 - 摘要：Marine mussels secrete special adhesive proteins which have excellent adhesive property even underwater and can attach to almost all types of surfaces, including adhesion-resistant poly (tetrafluoroethylene)(PTFE).This special adhesive behavior has aroused great attention and shines light on preparation of under-water adhesives. Inspired by mussel, scientists and engineers have exploited numerous multi-functional and high-performance bio-mimic materials. In this paper, progress on the design of mussel inspired polymers including the synthesized polypeptides, adhesive groups grafted polymers and polydopamine has been reviewed, and the application of these bio-mimic polymers is also involved.关键词：Mussel;Adhesive;Bio-mimic polymers
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发布时间：2022-09-18 - 摘要：This article reviews the progress of internal and external donors used in the Ziegler-Natta catalysts for propylene polymerization. The internal donors include1, 3-diether, diol ester, butanedioic diester and 1-ether3-ketone compound. The external donors include mixture of external donors and silane containing N atoms. The requirement for cleanness of polypropylene is becoming higher and higher. The internal and external donors are not only required to prepare high performance Ziegler- Natta catalysts, but also are clean. Thus, this article also discusses the cleanness of the internal and external donors.关键词：Internal donor;External donor;Ziegler-Natta Catalysts;Polypropylene;Cleanness
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发布时间：2022-09-18 - 摘要：Ionic liquids (ILs) have attracted considerable attention and are widely used in the field of polymer science because of their negligible volatility, thermal stability, non-flammability, and high ionic conductivity. There is no a common theory or method defining the solvation of ILs like that of molecular solvents because of the complexity of the interactions between anion and cation of ILs. The compatibility of polymer and ILs can not be easily characterized using commonly accepted parameters. In order to address some primary rules behind the solubility phenomenon of polymers in ILs, the effects of different interactions between anion and cation on the solubility of different kinds of polymers in imidazolium ILs were discussed based on four interactions.关键词：Ionic liquids;Polymers;Interactions;Solvation properties;Compatibility
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发布时间：2022-09-18 - 摘要：The thiol-ene addition reaction is a clean, efficient, robust and mild method with wide applications in organic synthesis, polymer and materials chemistry. Till now, there are a lot of references about this reaction, but which has been used rarely in organosilicon and this micro-review summarizes the reports that describe the thiol-ene reactions of vinylsilanes prepared in polycarbosilane, polysiloxane and polysilazane. The mechanism, kinetics and its potential applications of thiol-ene addition reaction were overviewed as well.关键词：Thiol-ene addition;Silicon containing polymers;Synthesis;Application.
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发布时间：2022-09-18 - 摘要：Conjugated polymers with strong light-harvesting capability, can amplify fluorescence signal and improve the sensitivity of biological detection.New type of biosensors based on conjugated polymers system are of importance in understanding the information transfer in biological systems, especially in the early diagnosis of disease. The main-chain structures of water soluble polythiophene derivatives are easily changed in the external environment, thereby causing the changes of absorption spectra and solution colors. In recent years, visual biological detections based on water-soluble polythiophene have been widely developed. In this review, the design, synthesis of water-soluble polythiophene derivatives and their applications in visual biological detections are introduced, and finally future trends in this area are discussed.关键词：Water-soluble polythiophenes;Design and synthesis;Optical properties;Visual biological detections
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发布时间：2022-09-18 - 摘要：Isotactic polypropylene is among one of the most applied general plastics. To overcome its shortcoming of brittleness, many methods were developed to modify the toughness of iPP, in which compounding with polyolefin elastomers is a commonly used method. In the present paper, characterization method on the miscibility of polymer blends and several well-established toughening theories were introduced, as well as the advance in polyolefin elastomer modifying iPP in recent years.关键词：Isotactic polypropylene;Polyolefin elastomer;Blends;Structure-property correlations
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发布时间：2022-09-18 - 摘要：As the most abundant natural polymer on the earth, cellulose has many attractive properties such as renew ability, biodegradability, biocompatibility, and bro ad chemical-modifying capacity. Cellulose has been considered as the sustainable raw material of energy and chemical engineering in the future. However, because of the well-developed intra- and intermolecular hydrogen bonding network, cellulose is unmeltable and insoluble in water or conventional organic solvents, which limits its wide utilization. More recently, it is found that certain ionic liquids (ILs) have excellent dissolving capability for cellulose, which provids a new and versatile plat form for cellulose processing and derivatization. A series of biopolymer-based materials, biomass energy, platform chemicals, and so on, have been produced with the aid of ILs. Based on about 210 relevant papers published during the past 10 years, this review article highlights recent progress in the field of dissolution, regeneration, derivatization, extraction and conversion of cellulose with ILs. In additon, a perspective on ILs application in cellulose chemistry in the future is briefly discussed. It is hoped that this review work will stimulate research and collaborations that will lead to significant progress in this area.关键词：Cellulose;Ionic liquid;Derivatization;Functionalization;Hydrolysis
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发布时间：2022-09-18 - 摘要：Simulation, theory and experiment are complementary and cross-validated, which enables us to understand the microscopic origins for the macroscopic phenomena. With the novel computational powers and advanced computational technologies, computer simulation has become a powerful and unique tool for polymer science, and played an important role in the optimal design of polymer materials and the study of structure-property relationships. Polymers are characterized by a broad range of length and time scales, their properties as well as functions are therefore not only dependent on the molecular species composing the systems but also significantly on their condensed states or phase morphologies. From this reason computer simulations appear as a natural choice for gaining such deep understanding on the structure-property relationship in different scales, acting as a key step for the future material design. However, to bridge these disparate scales in the multiscale modeling of polymers, it is required to develop strategies for perfecting the simulation methods at these different scales and also for linking these scales so that various levels of simulations are coupled and fed back into each other. Among these, developing a structurally and thermodynamically consistent coarse-graining approach to bridge the gap between atomistic and mesoscopic simulation is extremely urgent.关键词：Polymer;Multiscale simulation;Coarse-grained molecular dynamics simulation;Systematic coarse-graining approach
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发布时间：2022-09-18 - 摘要：This article summarizes recent studies on the physics of single polymer chains by the application of single molecule fluorescence techniques, especially the recent researches from our laboratory. By applying single molecules microscopy and spectroscopy, such as fluorescence correlation spectroscopy, photon count histogram, single molecule fluorescence imaging, and single molecule fluorescence de-focus imaging, we have studied conformational transition and counterion distribution of polyelectrolytes, single chain dynamics of polymers at interfaces, single chain diffusion and segmental motion of polymers under confinements. The results indicate the great potential of single molecule fluorescence techniques in the study of polymer physics.关键词：Single molecule fluorescence;Single chain of polymer;Poly electrolytes;Polymer crystallization;Glass transition
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发布时间：2022-09-18 - 摘要：Specific topological-structured polymers have been a target of long-term pursuit in synthetic polymer chemistry. Among them, polyolefins with some specific topological structures (block, graft, comb, star, etc.) are of particular interest in that they represent an important promotion of polyolefins from commodity polymers with already large volume productions and widespread applications to value-added polymers with furthered properties and even expanded usages. Given the significant progress made in recent years on both polyolefin catalysts and polymerization methodologies, the development of topological poly olefins has also been at fast-pace, with some polymers already demonstrating unique, unprecedented functionalities. This review will at first describe the status quo of general topological polyolefins development, followed by an introduction to topological polyolefins research at ICCAS where the focus is on a new approach utilizing styryl-capped polyolefins as building block to construct versatile topological polyolefin architectures.关键词：Olefin coordination polymerization;Chain transfer reaction;Polyolefin;Topological structure
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发布时间：2022-09-18
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