最新刊期
卷 25 ， 期 5 ， 2012
- 摘要：Surface acoustic wave (SAW) gas/vapor sensor is widely used in the fields of environmental monitoring, health care and chemical detection to detect toxic and hazardous gases/vapors on-site and real-time for its advantages of high sensitivity, good selectivity, fast response, small size and easy to carry, etc. The characteristics of the sensitive coating materials is the key factor that determine the performance of SAW gas/vapor sensor, such as sensitivity, selectivity, response time and life. In this paper, the principle of SAW sensor response and the requirements for sensitive coating materials were briefly introduced firstly. Then the research progress of the organic polymer coating materials used in SAW sensors was described in detail and a simple prediction for the research trends was made at last.关键词：Surface Acoustic Wave (SAW);Gas/Vapor Sensor;Coating Material;Organic polymer
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发布时间：2022-09-18 - 摘要：Since step-growth polymerization (SGP) has quite wide application in many fields, and usually the molecular weight of polymers obtained by SGP is gradually increased, more and more importance has been attached to the synthesis of novel polymer materials via SGP. According to the different types of SGP, the research progress of SGP in recent years, especially the polycondensation used in synthesis of polyesters and etc, the polyaddition of diisocyanate monomers and the polyaddition via click reaction are reviewed. In order to further obtain polymers with fine properties, desirable molecular weight and ideal structure by simple preparation method in the future, it is necessary for the SGP research to strengthen the theoretical study, design the monomers with new structure and fully develop the corresponding new synthetic technologies for STG.关键词：Step-Growth Polymerization;Polycondensation;Polyaddition;Ring-opening polymerization;Polyester;Diisocyanate;Click reaction
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发布时间：2022-09-18 - 摘要：Polymer chains attached onto materials surface by physical adsorption or chemically grafting and formed brush-like polymer monolayer is called as polymer brush. Stimuli-responsive polymer brushes display reversible changes on the physical and chemical properties in accordance with the small external changes in their environment. The polymer chains conformation could stretch or collapse, which has shown great potential application in recent years. The development of stimuli-responsive polymer brushes, including pH-responsive, temperature-responsive, and photo-responsive polymer brushes and different synthesis methods, were reviewed. Their applications in intelligent membrane, drug delivery, catalysis, self assembly, molecular device, and so on were introduced with some emphasis.关键词：Stimuli-responsive;Polymer brush;Synthesis;Applications
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发布时间：2022-09-18 - 摘要：As a nature polymer, chitosan has been attracted more and more attention in drug delivery systems because of its outstanding properties, such as non-toxic, biodegradable and biocompatible. Chitosan based nanocarriers can be prepared easily, and recently, the researches of these nanocarries are very novel too. On the basis of the propulsion to formulate nanocarriers, the review is to summerize the latest preparation of modified chitosan derivatives from four aspects:covalent crosslinking, ionic crosslinking, polyelectrolyte complex, and the self-assembly of hydrophobically modi? ed chitosan. And the review is to introduce the effect on drug delivery of drug loading content, drug loading efficiency, release behavior and cytotoxicity, furthermore, outlook the future application.关键词：Chitosan;Nanocarrier;Drug delivery
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发布时间：2022-09-18 - 摘要：Nanogels with particle sizes ranging from 1 to 1000 nm have attracted worldwide attention due to their potential applications in drug delivery,medical diagnosis, biosensor, bioseparation, etc. This review describes the research progress of nanogels synthesizing methods based on their raw materials, including polymerization of monomers with crosslinkers and post-crosslinking of polymers. The former can be categorized into three kinds of methods:precipitation polymerization, inverse emulsion polymerization and micromold polymerization. The latter can be classified into four kinds of methods:precipitation/crosslinking, emulsion/crosslinking, micromolding/crosslinking and self-assembly/crosslinking. Furthermore, the advantages and disadvantages of these methods are reviewed, and some viewpoints on synthesizing the nanogels for biomedical applications are put forward.关键词：Nanogel;Synthesis method;Research progress
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发布时间：2022-09-18 - 摘要：Poly(acrylonitrile-butadiene-styrene) terpolymer (ABS) resin has been widely used because of its excellent mechanical property, thermal stability, chemical resistance, aesthetic property, processability, etc. In this paper, the manufacturing techniques and preparation methods of ABS resin at home and abroad were summarized, and it points out that the continuous bulk polymerization method has advantages and will compete and coexist with the emulsion polymerization method for a long time. Moreover, the emphasis was put on the rubber types used as toughening modifiers of ABS resin and their toughening mechanism. Finally, the application status and development prospect of the instrumented impact tester in the performance characterization of polymer, especially in ABS field, were also discussed. The dynamic fracture progress and mechanism of resin materials can be deeply evaluated by combining the microscopy and the instrumented impact method.关键词：ABS resin;Manufacturing technique;Rubber toughening;Toughening mechanism;Instrumented impact
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发布时间：2022-09-18 - 摘要：Nitroxide-mediated radical polymerization (NMP) is one of the most important techniques to prepare polymer materials with well-defined molecular structure, and made considerable achievements in the past decades, achieving the controlled/living polymerization of kinds of monomers such as MMA, n-BA, acrylamide, alkadiene and acrylonitrile, with PDI<1.1; and succeeding in producing a significant variety of architectures including block copolymers such as graft, star, and comb structure, etc. Moreover, the combination with photo-initiated technique presented NMP a greater breakthrough, performing control/living polymerization in room temperature, which is with more rapid reactive rate. The recent developments of photo-initiated nitroxide-mediated polymerization had focused on the new photosensitive technique, including intermolecular and intramolecular photosensitization. In this paper, we review the recent achievements of photosensitization applied in NMP and give understanding on the photosensitized mechanism, it would be help to research working deeply in this area.关键词：Photo-initiated nitroxide-mediated polymerization;Photo-living polymerization;Intermolecular photosensitization;Intramolecular photosensitization
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发布时间：2022-09-18 - 摘要：As the ever-growing demand for healthy living, there is a keen interest in materials capable of killing harmful microorganisms in both academic and industry fields. Recently, research on polymeric biocides have been prosperous due to their inherent nature of bearing a higher local density of active functional groups in the vicinity of polymer chains, longer duration of action, reduced toxicity, lower irritation to human beings as well as diverse modification. Among them, polymeric quaternary ammoniums (PQAs) have been widely investigated. Thus, in this article, progress on several kinds of novel PQAs developed in recent years was introduced according to their different skeleton configuration. Meanwhile, future applications and perspectives in the field of antimicrobial PQAs were also discussed.关键词：Polymeric quaternary ammoniums;Antimicrobial materials;Dendrimers
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发布时间：2022-09-18 - 摘要：Silicone rubber has extensive application in medical field due to its valuable properties such as no-toxic to human organism and good biocompatibility. Normally, silicone rubber used as medical materials must contact with human organism which makes the chance of invasion by bacteria and results in infection. So the silicone rubber must be antibacterial when used as medical materials. Antibacterial properties of silicone rubber could be achieved through bulk or surface modification. Investigation about antibacterial silicone rubber has become extraordinary attention by material scientists and doctors. In this paper, references about investigation of antibacterial silicone rubber are summarized. Method of the preparation of antibacterial silicone rubber and its antibacterial properties are reviewed. The merit and demerit of the preparation of antibacterial silicone rubber are also compared and investigate direction about the antibacterial silicone rubber used as medical materials are prospected.关键词：Silicone Rubber;Antibacterial;Surface modification;Blend
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发布时间：2022-09-18 - 摘要：A novel amphiphilic block copolymer functionalized with strong push-pull azobenzene moieties, P(HEMA-b-6CNAzo), was synthesized by using ATRP. First, the macromolecular initiator P(HEMA-TMS) was prepared through ATRP reaction of monomer HEMA-TMS, which was hydroxylethyl-mathacrylate (HEMA) protected with trimethylsilane (TMS) groups. Then, the precursor diblock copolymer, P(HEMA-TMS-b-6MA), containing aniline groups was prepared by a P(HEMA-TMS)-initiated ATRP of 6-(N-methylanilino)hexyl methacrylate. The amphiphilic azo block copolymer, P(HEMA-b-6CNAzo), was obtained by azo-coupling reaction between P(HEMA-TMS-b-6MA) and diazonium salt of 4-aminobenzonitrile and the TMS groups were removed at the same time because of the acidic conditiond. The macro-initiator and block copolymers were characterized by GPC, 1H-NMR and UV-vis. GPC results showed that both P(HEMA-TMS) and P(HEMA-TMS-b-6MA) had narrow molecular weight distributions. 1H-NMR analysis indicated that the ratio of polymerization degree for HEMA andP6MA blocks is 0.95∶1. The conversion rate of azo-coupling reaction and hydrolysis of TMS groups were close to 100%. By adding deionized water under a rate of 1μL/s to a THF solution of P(HEMA-b-6CNAzo) with the concentration of 0.2g/L, the amphiphilic block copolymers self-assembled to form colloidal spheres with sizes in range from 60 and to 80nm.关键词：Azo polymer;Block copolymer;Amphiphilic;Synthesis;Characterization
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发布时间：2022-09-18 - 摘要：In this paper, the properties of silk fibroin solution from different divisions of silk gland of silkworm (including the anterior, the middle and the posterior divisions) were investigated by polarized microscope. Meantime, Raman spectrum and rotational rheometer were used to analyze the structures and rheological properties of silk fibroin solutions in the different parts of the middle division (including the anterior, the middle and the posterior parts). It was found that only the anterior division and the anterior part of the middle division showed birefringence. Furthermore, with flowing from the posterior part to the anterior part in the middle division of silkworm, the silk fibroin was gradually transfered from random coil into α-helix conformation and then into β-sheet, the viscosity and elasticity of the silk fibroin solution decreased. These results implied that the liquid crystal state structure had been possibly formed in the anterior part of the middle silk gland of silkworm.关键词：Silkworm;Silk gland;Silk fibroin;Structure;Rheology
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发布时间：2022-09-18 - 摘要：This paper mainly introduces the status quo of researching on PVB (Polyvinyl Butyral) material properties at home and abroad. It shows that PVB is strain rate dependence and temperature sensitivity material. While strain rate increasing, elastic modulus will larger; While temperature increasing, elastic modulus and shear modulus decreased. Meanwhile, there are few experiments at home and abroad researching on the constitutive model of PVB. In general, PVB can be described as four constitutive models: linear elastic, elastic-plastic, linear viscoelastic and non-linear viscoelastic, but essentially PVB is non-linear viscoelastic materials. Different environmental conditions and computing requirements should choose different constitutive model. At present, scholars both domestic and oversea recognize using hyperelastic to consider the nonlinear, and considering the viscoelastic by a Generalised Maxwell Series.关键词：Polyvinyl Butyral (PVB);Strain rate dependence;Temperature sensitivity;Experimental research;Constitutive model
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发布时间：2022-09-18 - 摘要：With the advantages both of reactive surfactants that they polymerize to the polymer by covalent bond avoids surfactants removes from material,and polymeric surfactants that they properties stable,waterproof,harmfulless,reactive polymeric surfactants are attracting increasing interest.Because polyurethane reactive polymeric surfactants have the advantages of adjustable hardness and high reactivity,be highly focused.In this paper the recent development of polyurethane reactive polymeric surfactants both domestic and overseas were reviewed,and the synthetic ways and application performances were summarized,and the further research prospect in this field was also described.关键词：Polyurethane;Reactive;Polymer;Surfactant
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发布时间：2022-09-18 - 摘要：Thiophene-based narrow band gap conjugated polymers with good stability and machinability for Solar cell applications have been the hot topic of new solar cells. This paper mainly introduced research progress of narrow band gap conjugated polymers for solar cells. According to the structure characteristics, the narrow band gap conjugated polymer was divided into alkyl- or alkoxy-substituted polythiophene, polyisothianaphthene, thiophene-based copolymers, pyrazine, thiazole, phenothiazine, fluorene and others. And their structural characteristics, optical band gap, synthesis methods were summarized. In addition, the existing problems and the further trend of this kind of materials in this field have also been discussed in this paper.关键词：Narrow band gap;Thiophene;Conjugated polymers;Solar cells
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发布时间：2022-09-18 - 摘要：Polymer chemistry is a science of researching on polymer synthesis and chemical reaction. It is one of the most important required courses for polymer materials major and a selective course for non-polymer engineering specialties such as applied chemistry and chemical engineering and technology etc. The problems and countermeasures in polymer chemistry teaching for non-polymer engineering specialties were explored and practiced actively in this paper. Based on many years of polymer chemistry teaching experience, several aspects were suggested to be advantageous to enhance the polymer chemistry teaching effect, such as how to organize the first lesson, selection of teaching contents, developing extracurricular activities and improving the teaching methods.关键词：Non-polymer engineering specialties;Polymer chemistry;Teaching effect
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发布时间：2022-09-18 - 摘要：Polymer chemistry is one of the most important specialized courses for the student majoring in polymer materials, contains both the theoretical knowledge, but also pay attention to experimental teaching.As an important specialized basic course of polymer material and engineering major in Guizhou University, from the teaching system, teaching content, teaching methods, evaluation methods, teaching materials preparation and other aspects, some proposals of teaching reform for polymer chemistry are proposed based on the current situation and existing problems in our university.The practice shows that the teaching exploration can stimulate students learning interests and improve students comprehensive ability.关键词：Polymer chemistry;Teaching reformation;Proposals
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发布时间：2022-09-18 - 摘要：In order to satisfy a requirement of polymer materials and engineering talents for social,training the students practical ability,improved the student to analyze and solve the question level,comprehensive and design experiments teaching for "Experiments of Polymer Physics" were reformed and researched.In the process of writing experiments teaching materials, many research projects were used to design comprehensive and design experiments including many simple experiments of polymer physics in order to meet the requirements of undergraduate teaching.An effective evaluation system was established.The practice indicates that it can significantly improve the students’ experimental abilities,innovative abilities and comprehensive quality.关键词：Experiments of polymer physics;Comprehensive experiment;Design experiment;Teaching reformation
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发布时间：2022-09-18
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