最新刊期
卷 29 ， 期 11 ， 2016
- 摘要：Supramolecular polymer composites (SPCs) are defined as the composites composed of supramolecular polymers as matrix and fibers or fillers as reinforcements. SPCs have three types that the matrix and reinforcements can be linked by covalent bonds, non-covalent bonds or no chemical bonds. The research and development of SPCs form whole science and engineering system of polymer composites together with the covalent bonded polymer composites. In this paper, hydrogen bonded, π-π stacked and metal-ligand coordinated (metallosupramolecular) SPCs as well as their self-healing behavior and mechanism are reviewed.关键词：Supramolecular polymers;Polymer composites;Self-healing behavior
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发布时间：2022-09-12 - 摘要：In this article, effects of ion content, counterion, ionic group, short-range chain-structure (flexibility, permittivity, group steric-hindrance, branching, covalent cross-linking, etc.) of the matrix polymer, degree of neutralization, ionic-group distribution along the backbone chain, ambient conditions (temperature, solvent, water, etc.), and preparation history (melt pressing, solution casting, re-precipitation, high-temperature annealing, etc.) on the ion-aggregation morphology (fraction of aggregated ionic-groups, shape, size, aggregation number, number density, distribution-in-matrix and internal coordination structure of ionic aggregates) have systematically been reviewed for ionomers. On the basis of this, it has been pointed out that four basic issues on ion-aggregation morphology are urgent to be resolved, i.e., whether there exists an ordered arrangement of atoms inside the ionic aggregates, origin of the low-temperature differential scanning calorimetry (DSC) endothermic peak of ionomers, disadvantages of the currently-held ion-hopping theory, and effect of molecular weight, an important index to long-range chain-structure of the matrix polymer, on the ionic-aggregate morphology. Particularly, it has been suggested that, to extend and perfect the ion-hopping theory, we accommodate two morphological factors, ionic-aggregate aggregation number (i.e., extent of chain-segment close packing in the coronas of ionic aggregates) and number density (i.e., ionic cross-linking density), in addition to the pre-existing structural factor, strength of ionic interactions, thereby to reasonably explain or predict the structure-property relationships of ionomers.关键词：Ionomer;Ionic aggregate;Morphology;Aggregation number;Number density
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发布时间：2022-09-12 - 摘要：As one of the most important aliphatic polycarbonates, poly(trimethylene carbonate) (PTMC) has been widely studied because of its well-documented biocompatibility, biodegradability and rubber-like properties. This paper summarized the progress in performance improvement of PTMC, and especially discussed the methods of functionalization, copolymerization and blend modification of PTMC. The effect of the improvement methods on the performance of PTMC was exhibited. At last, this paper summarized the potential applications of the modified PTMC in biomedical fields.关键词：Poly (trimethylene carbonate);Functionalization;Ring-opening copolymerization;Blend modification;Biomedical materials
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发布时间：2022-09-12 - 摘要：At present, matt paints are traditionally added matting agent and extinction resin to reach a low gloss. In this paper, the research progress of matting agent and extinction resin, used in various kinds of matt paints, is reviewed, particularly the modified silica matting agent and new extinction resin used in the UV-curable matt paints. Meanwhile, the major problems in domestic research and applications of matting agent and extinction resin are indicated. The future application prospect and development trend are also pointed out.关键词：Matt paints;Matting agent;Extinction resin;Ultraviolet curing
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发布时间：2022-09-12 - 摘要：To improve the dispersibility of carbon nanotubes (CNT) in high density polyethylene (HDPE), carbon nanotube paper (CNP) was prepared by vacuum filtration method and then CNP/HDPE composites were prepared through hot-pressing. The morphology, pore size and mechanical property of the CNP and electrical heating property of CNP/HDPE composites are investigated. Results indicated that the resultant CNP with flat surface and porous structure possess of a certain level of strength and flexibility. The pore size is 20nm~40nm. Three-layered HDPE/CNP/HDPEcomposites show that the tensile strength and modulus are 24.88MPa and 1.953GPa respectively which are higher than those of pure HDPE. The most important point is that the electrical heating properties of CNP/HDPE sandwiched composites is much better than that of CNT/HDPE mixing blend composites with the same content of carbon nanotubes.关键词：Carbon nanotube paper;Electrical heating property;Conductive composite;Polyethylene
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发布时间：2022-09-12 - 摘要：In the test of the macromolecular weight and molecular weight distribution by Gel permeation chromatography(GPC),according to the phenomenon that the micromolecule ethylene glycol’s peak time is constant in the system,this research used ethylene glycol’s peak time as a marker, The chromatographs under the relative time are used to establish a calibration curve which istransformed from those under the absolute time. This project solves the problems caused by the repeatability of GPC instrument’s instability, the declination of chromatographic column efficiency and the replacement of chromatographic column in the records of chromatogram,the establishment of calibration curve and the calculation of molecular weight under the real time.关键词：Gel permeation chromatography;Relative time;Calibration curve
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发布时间：2022-09-12 - 摘要：With taking St and AM as main monomers, CTAB as phase transfer emulsifying agent, epoxy chloropropane, trimethylamine as quaternary ammonium reagent, a self-made polymer emulsifier was synthesized. The emulsifier is more stable comprising CTAB 1g, AM 5g and ECH 5.2g. The article also investigated the influences of different functional monomers on the polymer emulsion water resistance and particle size. The results showed:the cationic emulsion comprising DAAM-ADH 1.0g had the best water resistance. Finally, a core shell emulsion was made by adding nano-sturcuted alumina transparent dispersion, and we know that the emulsion prepared by dispersion 20 g gave a better state and stability.关键词：Acrylamide;Core-shell emulsion;Water resistance;Particle size
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发布时间：2022-09-12 - 摘要：The structure and physicochemical properties of pea starch by ball milling were studied in this paper. The granular morphology, crystal texture and physicochemical properties of it were further characterized using scanning electron microscopy, laser particle size analyzer, X-ray diffractometry, infrared spectrometer, differential scanning calorimetry, rapid visco analyzer. The results show that micronized pea starch granular is changed from smooth polygon to rough irregular shape, its median diameter is increased 23.28μm, its polarized light is disappeared. The crystal structure of pea starch is changed from polycrystalline to amorphous and is no new groups produced. Enthalpy and gelatinization point all is decreased and has a better viscosity stability. Its hot paste stability and mechanical stability are better than those of native pea starch.关键词：Ball-milling treatment;Pea starch;Structure;Physicochemical properties
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发布时间：2022-09-12 - 摘要：Polypyrrole (PPy) with different morphologies were prepared by chemical oxidation and electrochemical deposition. The experimental results showed that specific capacitance (SC) of the PPy microspheres was better than PPy nanoparticles, and exhibited typical pseudocapacitance behavior,which can quickly proceed the reversible Faraday response in redox reaction. The reason was attributed to the order molecular chains present in the PPy microspheres, which was in favor of forming the larger conjugated system in the PPy microspheres, and showed excellent property in electrochemical energy storage.关键词：Polypyrrole;Chemical oxidation;Electrochemical deposition;Specific capacitance
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发布时间：2022-09-12 - 摘要：Polymer materials is a compulsory course in specialty of polymer materials and engineering. It’s a basic course for the students to understand and master their professional knowledges. The improvements of teaching and assessment methods in course of polymer materials in specialty of polymer materials and engineering were discussed in this paper. The ways of a discussion on the importance of materials, market survey, homework speech, and communication with people of enterprise research and industry association were explored for improvement of students’ ability in service local economy. Meanwhile, the improvements of assessment methods were explored as well. The students’ interest was stimulated and learning effect improved. The teaching method is worth of popularization in similar courses.关键词：Practical teaching;Polymer materials;Teaching method;Assessment method
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发布时间：2022-09-12 - 摘要：Engineering education accreditation has been implemented in the advanced engineering specialized subject with the reform of advanced engineering education and the development of society. The most important changes in higher education project concept are to implement teaching activities following the accreditation’s core concepts of output-oriented and student-centered. This paper has introduced the reconstruction and reformation in the core curriculum "Polymer Materials Processing" in the Specialty of Polymer Materials and Engineering at Changzhou University. According to the core idea of engineering education accreditation,the exploration and reformation are carried on at teaching aims, teaching content, teaching method and continually improvement based on the goal of reaching graduation requirements and student-centered.关键词：Engineering education accreditation;Polymer materials processing;Talent training
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发布时间：2022-09-12 - 摘要：Polymer Experimental is the core course for the students majored in materials science especially in polymer materials. In this paper, based on our more than ten years practice and continuous improvement on offering Polymer Experimental course, we summarize the polymer experimental teaching system from six aspects including the local industry related experiments, the application-oriented experimental projects, educational experimental projects, open experiments, comprehensive experiments and the preparation of experimental textbooks. Our Polymer Experimental teaching practice and some measures with developing application and innovation abilities as the core goal may provide helpful references for experimental teaching in the same type or other similar universities.关键词：Polymer experimental;Experiment teaching system;Normal colleges oriented’ feature
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发布时间：2022-09-12 - 摘要：Polymer chemistry is a typical experimental subject. It is the basis of the synthesis, processing and application for the polymer materials. It is also one of the entrance exam subjects for postgraduate students. However, how to improve the students’ ability of observation and operation becomes the key topic of training for colleges in recent years. In the experimental synthesis methods for polymer chemistry, suspension polymerization method is widely used in synthetic process for polymer materials such as rubber, plastics and others due to its advantages such as low reaction temperature, convenient operation, easy heat transfer in reaction process, the cheap water as the dispersion medium and the polymer particle size is easy to control. In order to improve the students comprehensive experimental ability and embark on scientific research as soon as possible, based on the suspension polymerization experiment of polymer chemistry, this paper shows the students various experimental phenomena and results of chemical reactions in different reaction conditions and time from multiple perspectives such as see, hear, touch and sniff.关键词：Experimental teaching;Polymer chemistry;Suspension polymerization experiment;Teaching reform;Experimental ability
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发布时间：2022-09-12
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