最新刊期
卷 30 ， 期 9 ， 2017
- 摘要：Biomass is a class of abundant renewable resource.The high efficiency use of biomass not only has a great economic and ecological value,but also of great significance for the implementation of sustainable development strategies for new energy and new bio-based synthetic materials.2,5-furandicarboxylic acid (FDCA) as a bio-based monomer,can be obtained now in mass amount from plant cellulose via simple bio-or chemical processes.FDCA can be used for the syntheses of the FDCA based polyesters.These polyesters have excellent properties and are regarded as bio-degradable potentially substitution materials for aromatic polyesters (such as PET),which are synthesized from oil-based purified terephthalic acid (PTA).The properties and preparation methods of bio-based monomer FDCA are briefly summarized.The synthesis and properties of FDCA based polyesters,including poly(ethylene 2,5-furandicarboxylate) (PEF) and poly(1,4-butylene 2,5-furandicarboxylate) (PBF) are discussed.The progress of FDCA based polyesters application is introduced,and the expectations for the development and prospect of FDCA based polyesters are proposed.关键词：Biomass;2, 5-Furandicarboxylic acid;Polyester;Synthetic materials;Application
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发布时间：2022-09-06 - 摘要：Tannic acid(TA)is one of the plant polyphenolic compounds which can be widely found in plant roots, stems, leaves and fruits. TA belongs to the family of hydrolysable tannins and has many advantages such as low cost, wide source,good biocompatibility and so on. With abundant hydroxyl groups and ester groups TA possesses high chemical reactivity. Due to the special molecular structure-the hydrophobic planar aromatic nucleus and the hydrophilic hydroxy substituent, TA can interact with the various groups and molecules to form hydrogen bonds, hydrophobic interactions, electrostatic interactions and π-stacking (van der Waals) interactions. Over the past few years, TA has been widely applied in functional materials. In this paper, the latest developments on TA-based functional materials, involved with metal nanomaterials, surface modification, microcapsules and self-assembly materials are reviewed. Besides, the outlook for future potentials of TA-based functional materials is proposed in the end of this review.关键词：Tannic acid;Functional materials;Surface modification;Metal nanoparticles
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发布时间：2022-09-06 - 摘要：The objectives of this paper are to review the techniques to prepare selective laser sintering polymer powder, including mechanical crushing, direct polymerization and solution techniques. Moreover, some novel powder preparation techniques including phase separation, microfluidic device, "swelling" crushing and water dispersion. In addition, the applications of different types of polymer powders were also discussed. Furthermore, the effects of powder particle size, morphology, particle size distribution On the performance of selective laser sintering process were summarized.关键词：Selective laser sintering;Polymer powder;Preparation methods
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发布时间：2022-09-06 - 摘要：Graphene as the most popular nano-materials nowadays, attracting the attention of many researchers at home and abroad. Graphene has a huge application in thermal conductive epoxy composite materials prospects because of its high thermal conductivity. In this paper, the progress of thermal conductivity of graphene/epoxy composites is reviewed. The effects of various factors such as the regulation of the size of graphene, the complexing with other fillers and the surface modification of graphene are introduced in detail. In addition, the influence of the microstructure of the composites on thermal conductivity was analyzed. Finally, the development of thermal conductive graphene/epoxy composites is prospected. The technical difficulties and unknown mechanism in this field are also put forward.关键词：Graphene;Epoxy;Surface modification;Thermal conductivity
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发布时间：2022-09-06 - 摘要：Silicone rubber (MVQ) and fluorine rubber (FKM) as a defense aerospace and other important areas of heat-resistant materials have been favored, but they have their own advantages and disadvantages and the both kind of rubbers are expensive. In this work, we try to prepare MVQ/FKM blends to solve the fluorine rubber intolerant low temperature and poor processing problems with a view to increasing its use temperature range. MVQ/FKM blends were prepared by mechanical blending. The mixing process, ratio, vulcanization system and curing conditions of silicone rubber/fluorine rubber were studied with the mechanical properties. The results show that the mechanical properties of the blends are the best when the blend ratio of silicone rubber/fluorine rubber is 10:90, the vulcanization system is 3# curing agent/dicumyl peroxide (DCP), the first curing conditions are at 170℃ under 10MPa for 30min, and past curing conditions are at 200℃ for 6 hours.关键词：Fluorine rubber;Silicone Rubber;Rubber blends;Preparation;Mechanical properties
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发布时间：2022-09-06 - 摘要：In this paper, natural rubber is used as raw material for mechanical refining at different levels. The structural properties of the natural rubber are studied by changing their average molecular weight. The average molecular weight of the natural rubber decreases and the plasticity increases, and the solubility of the natural rubber in the organic solvent cyclohexane increases remarkably, and the maximum solubility is close to 29%. With the same solid content, the viscosity of the solution increases with the decrease of the average molecular weight of rubber. Natural rubber solution adhesive with good performance can make effective adhesion between the plastic sheet and film, and its elasticity will increase, thereby preparing a flexible, non-toxic, environmentally friendly organic table tennis racket surface adhesive glue, adhesive performance is superior to the traditional inorganic glue.关键词：Natural rubber;Plasticate;Environmental protection organic glue;Table tennis racket glue
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发布时间：2022-09-06 - 摘要：In this paper, a formula of porcelain silicone rubber composite which can make ceramic insulating layer protection cover on metal wire was studied. The ceramic temperature of material was 600℃ which was substantially lower than the current temperature as reported in the literature. By experiments investigated the influence of the substance dosage formulation on the material properties, got the optimal experimental formula composed of:alumina 10 parts, 15 parts of wollastonite and 15 parts of constitution controller A, lithium carbonate 3 parts. Under this condition the tensile strength was up to 10.79MPa, and the elongation at break was up to 316%, the compressive strength of 600℃ and 800℃ ablation residue were 3.47MPa and 10.13MPa, the volume resistivity was 134×1012Ω·cm. The volume resistivity of its ablation residues was over than 28×1013Ω·cm, and met the requirements as porcelain insulating material. The material properties were characterized by SEM analysis and thermogravimetric analysis. The results of thermogravimetric analysis show that the weight loss of the sample is reduced by 39.4% and the ablation residual rate is greatly improved. The results of SEM analysis show that sample structure is dense.关键词：Ceramic silicone rubber composite materials;Alumina;Wollastonite;Constitution controller
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发布时间：2022-09-06 - 摘要：In this paper, 0 to 20% of 1,3-dibromobenzene as a third monomer, the second monomer is 1,4-dibromobenzene and p-quinine demine with a Ni (Ⅱ) catalyzed synthesis of different proportions poly (1,4-benzoquinone demine 1,3-dibromobenzene bromophenyl) random copolymer. Test methods and by infrared spectroscopy (FT-IR), ultraviolet-visible absorption spectroscopy (UV-Vis), X-ray powder diffraction (XRD), thermal gravimetric analysis (TG), cyclic voltammetry (CV), charge and discharge of the copolymer characterization and performance tests conducted to study the effects on performance copolymer linked site. UV-visible absorption spectra showed a maximum absorption peak at 490nm appeared around the copolymer, P2, P3, P4, P5 and P1 in the absorption peak at this wavelength, respectively, compared red shift 10,19,34,24nm, wherein the copolymer P4 red shift of 34nm, has a high degree of conjugation; temperature reached 671℃ copolymer P2 was decomposed 40%, P1 when the temperature reached 577℃ decomposed 40%; cyclic voltammetry indicated that P1 to P4, the copolymerization peak area was gradually began to become larger, the greater the peak area, the greater the ratio of the capacitance of the copolymer to the peak area at the beginning of the copolymer P5 becomes smaller; discharge copolymer P4 show the longest discharge time, begins to increase from P1 until P4, P5 into the copolymer begins to decrease the discharge time.关键词：Benzoquinone demine;Ni(Ⅱ) catalyst;Mixed condensation
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发布时间：2022-09-06 - 摘要：The grafted poly(lactic acid)/thermoplastic starch blends with glycidyl methacrylate and thermoplastic starch addition were prepared by extrusion and injection molding technologies to improve the interfacial adhension of PLA/starch and lower the cost. Infrared spectrum analysis confirms that GMA has been successfully grafted onto the PLA. The mechanical properties, the thermal properties, the morphology of fractured composite surfaces and hydrophilic properties above were well-analyzed. The optimum results of tensile strength, elongation at break and elasticity modulus are 42.6MPa, 8.9% and 260MPa respectively, which is explored at the mass of 6% GMA and 10% TPS (the grafting ratio is 1.51%). Compared with higher thermoplastic starch content in the blends, the FE-SEM observations show that the starch particles on the tensile fracture surface of lower thermoplastic starch content are better embedded in the matrix, resulting in the partial starch granules and a strong interfacial adhension obviously. DMA and DSC results show that Tg, storage modulus, crystallinity, crystalline temperature and melting temperature just change on a small scale with different mass ratio of PLA-g-6% GMA/TPS blends. The results of water absorption and contact angle values indicate that the blends of lower thermoplastic starch change less than those of higher thermoplastic starch.关键词：Polylactic acid grafting copolymer;Plastified starch;Blend;Glycidyl methacrylate
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发布时间：2022-09-06 - 摘要：C6-oxidized regenerated cellulose,as a hemostatic material, its physic-chemical properties affect the hemostatic performance. To research the properties of oxidized regenerated cellulose with different three-dimensional structures and oxidation degree, we compared their water absorption, gelation rate, dissolution rate, degradation rate, ageing resistance, hemostasis effect. It was found that,with the increase of oxidation degree, oxidized regenerated cellulose has stronger water absorption, faster gelation rate, dissolution rate and degradation rate, but weaker ageing resistance, shorter lifetime. The mesh and porous structure of the fiber, compared with the compact structure of the gauze, is more advantageous to increase water absorption, speed up gelation rate and dissolution rate, meanwhile reduce the usage amount of the oxidizing agent and improve the ageing resistance. Fiber has faster hemostasis speed and better hemostasis effect than gauze in the same condition of oxidation degree.关键词：Oxidized regenerated cellulose;Oxidation degree;Hemostatic material;Specific oxidation
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发布时间：2022-09-06 - 摘要：In 2013, Zhejiang University has launched the graduate English course that would be fully taught by foreign teacher. Taking this opportunity, the Department of Polymer Science and Engineering has invited Prof. M. Grunze from Heidelberg University, Germany, to teach "Interface Science of Polymer". The aim of English course program is to improve student professional knowledge and communication skill in English, as well as to train young teacher. The program has been carried out for 3 years, and the teaching content, arrangement of class, student feeling, and learning experience are summarized. Furthermore, based on Chinese student characteristics, we have suggested several ideas and opinions for teaching and class management.关键词：Interface science of polymer;English course;Foreign teacher;Physics and chemistry of material surface;Teaching reformation
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发布时间：2022-09-06 - 摘要：Engineering ethics education in comprehensive experiment week was first proposed as a new teaching method beyond traditional mode such as stand-alone courses and ethics across curriculum, which conforms to the practice bias of engineering education. "Material recycling and resource utilization comprehensive experiment week" was used as an example, and the teaching aims, content design, teaching forms, and evaluation standards were discussed particularly for engineering ethics education. By highlighting effectiveness of such practice, this mode is able to raise students’ awareness of engineering ethics and improve their practical ability.关键词：Engineering ethics;Comprehensive experiment week;Practice teaching method;Material recycling
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发布时间：2022-09-06 - 摘要：Plastic products and mould design is an important specialized course of polymer materials and engineering. This course with strong comprehensiveness, practicality, and interdisciplinary, which have the closest relationship with our life reality and production. According to the training objectives of application-oriented talents, the purpose is to improve the learning enthusiasm and practical skill of the students in the course teaching reforms accompany with teaching process.The teaching reforms are theory teaching and practical teaching. The ability of mold design has been preliminarily formed, and the teaching effect has been reflected among the students.We hope the results of course reform will attract more students, thus greatly promote the course reform, and provide services for training application-oriented talents.关键词：Polymer materials and engineering;Application oriented talents;Mold design
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发布时间：2022-09-06
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