最新刊期
卷 35 ， 期 6 ， 2022
- 摘要：Magnetically responsive shape memory polymer is a class of intelligent materials that can change its shape in response to stimulation of external magnetic field. It provides a new way to solve the problem that the thermally responsive shape memory polymer cannot be directly heated to recover the permanent shape in some situations. In this paper, the research progress of magnetically responsive shape memory polymer is reviewed. The mechanism of magnetically responsive shape memory polymer is discussed in combination with magnetocaloric effect, and an athermal magnetically responsive shape memory polymer is introduced. Secondly, the main matrix materials used for magnetically responsive shape memory polymer are introduced. Then, the application progress of magnetically responsive shape memory polymer in the fields of biomedical, self-healing and soft robotics is introduced. Finally, the advantages of magnetically responsive shape memory polymer are summarized, the problems faced are put forward and the prospect is given.关键词：Magnetic response;Shape memory polymers;Composites;Magnetocaloric effect
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发布时间：2022-09-09 - 摘要：Ultra-high molecular weight polyethylene (UHMWPE) is widely used in many fields for excellent physical and mechanical properties. However, it is easy to form molecular chain entanglement for the extremely high molecular weight of UHMWPE, which dominates the long-range motion of UHMWPE molecular chain, affects the aggregate structure and the various properties of UHMWPE. Therefore, regulating the degree of molecular chain entanglement of UHMWPE is of particular importance to improve its processability and performance. In this review, the methods of regulating entanglement of molecular chains and the mechanism of disentanglement are summarized, including dissoluting UHMWPE in solvents, changing the crystallization conditions, blending modification and processing under different flow fields. The development of the regulating methods used for the molecular chain entanglement of UHMWPE is prospected.关键词：Ultra-high molecular weight polyethylene;Disentanglement;Blending modification;Flow field
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发布时间：2022-09-09 - 摘要：Polyhedral oligomeric silsesquioxane (POSS), as a kind of organic-inorganic hybrid material with nanometer structure, has attracted more and more researchers' attention.This is attributed to the excellent thermal and thermo-oxygen stability of Si—O—Si structures in POSS compounds, as well as the extensive adjustability of their organic groups. Combining POSS nanoparticles into polymer materials can significantly improve the flame retardancy, ablative resistance, heat resistance, oxidation resistance, mechanical properties and processing properties of polymer/POSS composites.In this paper, the structure, properties and synthesis methods of POSS are introduced to describe the changeable properties of POSS, summarize the research progress and the mechanism of functional POSS in polymer flame retardant, and look forward to the development trend of POSS in polymer flame retardant.关键词：POSS;The Modification;Flame retardant;Functional group;Polymer
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发布时间：2022-09-09 - 摘要：Functionalized carbon nanotubes/polymer composites have been widely used in energy storage and electronic devices due to their excellent properties. In this paper, three methods for functionalizing carbon nanotubes are introduced firstly. Then, the preparation processes of functionalized carbon nanotubes/polymer composites, including new preparation techniques such as electrospinning, electrodeposition and 3D printing which have emerged in recent years, are classified and summarized. At last, the research development of functionalized carbon nanotubes/polymer composites in the fields of supercapacitors, electromagnetic interference shielding and sensors is reviewed. Based on the literature, the future development directions of functionalized carbon nanotubes/polymer composites are prospected.关键词：Carbon nanotubes;Functionalization;Polymer;Composites
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发布时间：2022-09-09 - 摘要：In this study, superhydrophobic polyester fabric with silica nanoparticles was obtained through one-step method by using tetraethyl orthosilicate as silicon source and fluoroalkyl silane as hydrophobic agent. The scanning electron microscope, contact angle tester, Fourier transform infrared spectroscopy, and X-ray photoelectron spectrophotometer were used to characterize the surface morphology, wettability and chemical composition of the fabric. Besides, the oil water separation property was calculated. The water contact angle of the prepared polyester fabric was 156.2°, and the oil water separation efficiency was 98.32% for the first time and higher than 91% after 30 separation circles.关键词：Superhydrophobic;Polyester fabric;Oil-water separation;Nano silica
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发布时间：2022-09-09 - 摘要：To prepare poly(L-lactic acid) (PLLA) porous microsphere, the thermally induced phase separation (TIPS) method was applied to quench PLLA/acetonitrile solutions to the metastable state, resulting in liquid-liquid phase separation of the polymer solutions. By controlling the quenching time, the porous microsphere grew from lamellar bundles to microsphere. Meanwhile, with increasing quenching time, the PLLA microsphere transformed from α'- to more stable and compact-packing α-crystal. When the quenching time and temperature were kept constant, solutions with low PLLA concentration were favorable for the formation of bundles, whereas solutions with high PLLA concentration contributed to the formation of microsphere. At last, the mechanism for the formation of PLLA bundles or microspheres was discussed.关键词：Poly(L-lactic acid);Porous microspheres;Solution crystallization;Phase separation
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发布时间：2022-09-09 - 摘要：In this study, for the first time, poly(amido acid) (PAA) was capped using hydrophilic ionic liquid (IL), and then hydrophilic polyvinylpyrrolidone (PVP) was added to its N-methyl-2-pyrrolidone solution to prepare fibrous membranes by electrospinning. The electrospinning process of polyimide was made more stable by the addition of polyvinylpyrrolidone and ionic liquid. Scanning electron microscopy photographs showed that the prepared co-blended membranes could form continuous fibres, and the final prepared membranes possessed uniform fibre diameter and pore distribution. Tests confirmed that a voltage of 16kV, a jet speed of 0.8mL/min and a curing distance of 15cm was the optimum condition for electrostatic spinning process. After modification by IL capping and PVP co-blending, the fibre membrane obtained more excellent mechanical properties, with the elastic modulus increasing from 729.12MPa to 3131.78MPa, while the tensile strength increased from 86.84MPa to 196.05MPa and the elongation at break increased from 2.84% to 12.90%, with all data showing significant improvements. As a result of the modification with hydrophilic substances, the membrane surface wettability was significantly improved and the water contact angle decreased from 128.97° without modification to 34.89°. In addition, it has a better separation effect on emulsified oil/water mixture, and the maximum flux of the modified membrane can reach 275.47L·m-2·h-1 and the maximum separation efficiency can reach more than 92%, and it can maintain more than 80% separation efficiency after 10 cycles. These properties can provide new ideas for the design of this solution for future wastewater treatment.关键词：Electrospinning method;Ionic liquid;Polyimide;Wettability
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发布时间：2022-09-09 - 摘要：Polymer Characterization and Technology, which is a key elective course for graduate students majoring in chemistry, chemical engineering and materials, is a course with very strong practicability. In view of the practical goal and the need to strengthen the construction of the postgraduate course, we put forward the reform idea of interactive teaching mode of theory and experiment based on the analysis of the current situation and problems of graduate teaching. The effective integration of theory and experiment teaching is realized through designing new teaching content and adding the corresponding experimental teaching. The results of questionnaire survey indicated that graduate students show a high degree of satisfaction and recognition to this new interactive teaching mode of theory and experiment. The integration of theory and experiment teaching can effectively stimulates the graduate students' learning enthusiasm and participation. As a result, the teaching effect is greatly improved. Meanwhile, the practical ability and innovation ability of graduate students are also greatly improved. Besides, the practical effect of this postgraduate course is enhanced in graduate research.关键词：Polymer characterization and technology;Postgraduate teaching;Interactive mode;Teaching reform;Practice
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发布时间：2022-09-09 - 摘要：It is of great importance to improve the quality of training talents in engineering education in China by promoting the construction of new engineering disciplines, boosting the high degree of integration between major construction and industrial requirements, and enhancing the connotation of engineering education reform. The present study introduces the exploration, practice, and preliminary achievement of talent training mode reform of polymer materials and engineering major of Ludong University under the background of new engineering disciplines construction. A series of measures such as the determination of training objective, optimization of education program, cultivation of teachers' engineering practice ability, establishment the cooperation between school and enterprise for talent training, monitoring of teaching process and sustaining improvement have been applied for the reform. The research has certain reference significance for the cultivation of high quality engineering talents of polymer materials and engineering major in local universities.关键词：New engineering disciplines;Talent training mode;Polymer materials and engineering major
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发布时间：2022-09-09 - 摘要：In the course of polymerization reaction engineering, polymerization reaction engineering analysis is an important chapter of the course, and the average molecular weight and average degree of polymerization are the key contents of the chapter. Correctly understanding and mastering its concept and the connotation and physical meaning of various mathematical expressions to the study of this knowledge point and even the whole course is very beneficial. In this paper, the expression of number-average molecular weight is firstly derived by analogy method, and then the expression of weight average molecular weight is obtained by replacing the number with weight. According to the relationship of average molecular weight and molecular weight of monomer and the average degree of polymerization, and the expressions of the number average weight and the degree of polymerization were got respectively, and the knowledge of the average molecular weight and average polymerization degree were detailed analyzed and discussed, aiming to enable students to understand and grasp the average molecular weight and average polymerization degree systematically and profoundly.关键词：Polymerization reaction engineering;Average molecular weight;Average degree of polymerization;Monomer;Analyzed and discussed
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发布时间：2022-09-09 - 摘要：According to the requirements of cultivation talents of Polymer Materials and Engineering under the background of new engineering. In view of the current teaching situation of polymer composites, the teaching team attempted to reform the teaching methods to improve the teaching effects. The teaching team integrates the scientific research results into the classroom teaching of polymer/graphene nanocomposites. Through the analysis and discussion of scientific research achievements in the course teaching, students deepen their understanding of the rheological properties of composite materials, and build a bridge between the internal microstructure and external properties of composite materials, which provide theoretical guidance for the molding process of composite materials. Through practice, it improves students' interest in learning, cultivates students' innovative thinking and scientific research ability, and lays a foundation for the cultivation of innovative and applied talents in our university by practice.关键词：Scientific research achievements;Teaching;Compound material
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发布时间：2022-09-09 - 摘要：Polymer physics is the core course and theoretical basis for the students majoring in polymer materials science and engineering. but the knowledge of the course is difficult. It is easy to form a loose and fragmented teaching result in educational practices. Therefore, it is difficult for students to master the logic framework and the knowledge of the polymer physics course comprehensively and systematically. Experiment is a useful way to understand the course knowledge through practice method. The purpose of this paper is to design a comprehensive experimental teaching method to go through the polymer physics content; so that students can understand and master the logic framework and core knowledge of polymer physics deeper. And it also helps to improve students’ professional quality and experimental ability. Moreover, it will provide useful practical experience and reference mode for analyzing practical problems by using the knowledges of polymer physics.关键词：Comprehensive experiment;Polymer physics;Polypropylene;Foam;Experimental teaching designing
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发布时间：2022-09-09 - 摘要：With the implementation of the development of national strategy driven by innovation, new industries need a large number of professionals with the spirit of innovation and entrepreneurship and the eligibility of the developing requirements of new engineering. However, there are several problems (such as lack of understanding of innovation and entrepreneurship education, imperfect curriculum system and insufficient practice training) in the integration of innovation and entrepreneurship education into professional education. Meanwhile, there are also several puzzlers of the course construction, the training of professional teachers and the establishment of practical platform in the construction of polymer materials and engineering education under the background of new engineering. Therefore, we propose to promote the integration development of the innovation and entrepreneurship education and polymer materials and engineering education from three aspects: the establishment of integration mechanism, the cultivation of new teachers and practice platform.关键词：Innovation and entrepreneurship education;Professional education;New engineering course
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发布时间：2022-09-09 - 摘要：Skills extension training is a training course of materials major, which enhances the depth of the enterprise' participation in school teaching, broadens students' horizon, and boosting their abilities to solve the complex engineering problems. Nowadays, the promotion and improvement of this training course has become an important driving force for the integration of production and education. Herein, based on the deficiencies of "material professional skills extension training" in Taizhou University and the teaching reform under the background of the integration of production and education, some measures had been proposed to further improve students' engineering practice ability, including optimizing experimental content, winnowing a series of enterprise cases, carrying out field teaching in enterprise, and updating practice evaluation methods.关键词：Skills extension training;Integration of production and education;Field teaching;Engineering practice ability
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发布时间：2022-09-09
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