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Abstract: Analytical instrument is a kind of large-scale scientific instrument which is widely used in all walks of life. The state puts forward the guiding ideology of localization of scientific instruments, defines the main attack direction and the breakthrough of core technologies, and focuses on research and development of key technologies with first-Mover advantage and basic frontier technologies leading the future development. In order to discuss the present situation and future development of analytical instruments in Zhejiang province, this paper introduces the development status of analytical instruments in Zhejiang Province from the aspects of definition, characteristics, development status at home and abroad, objectively analyzes the overall technical development level of analytical instruments industry in Zhejiang province, reveals the core problems existing in analytical instruments in Zhejiang Province, and puts forward the countermeasures of establishing scientific management system, increasing investment in research and development of talents, government and enterprises working together to build characteristic industrial chain in Zhejiang province, realizing technological transformation, and combining intelligence, automation, Internet, Internet of Things technology, and expanding the fields of life and health and emerging materials, the analytical instrument industry in Zhejiang Province has a promising future.Abstract: Analytical instrument is a kind of large-scale scientific instrument which is widely used in all walks of life. The state puts forward the guiding ideology of localization of scientific instruments, defines the main attack direction and the breakthrough of core technologies, and focuses on research and development of key technologies with first-Mov...Learn More
Abstract: The molecular structure of glycidol contains two highly active chemical functional groups, epoxy group and hydroxyl group, so it is very active and is a very useful chemical substance. It can be used as plastics, fiber modifiers, epoxy resin diluents, halogenated hydrocarbon stabilizers, food preservatives, fungicides, etc. In the pharmaceutical field, it can be used to synthesize a series of blockers for cardiovascular diseases, HIV protease inhibitor for AIDS, antiviral drug, many lactones and glycerophospholipid, it can also be used as an important intermediate of some photoelectric materials and functional polymer materials. The partial reactivity of glycidyl depends on its epoxy ring acting as an alkylating agent. In addition, it is used in the production of flavorings and sweeteners. Glycidyl can also be used as a stabilizer, used in the production of petroleum, vinyl polymers, demulsifiers, dyeing layered agents and gelata applied in surface coatings, chemical synthesis, fungicides, solid fuels. It's also an important monomer and semi-finished product for synthetic surfactant. And its derivatives are also a kind of chemical raw materials, which are used in many fields such as resins, plastics, medicines, pesticides and auxiliaries. Therefore, more and more attention are paid to the synthesis and application of glycidol. However, the application of glycerol in our country is limited, and the industrial production is also lagging behind. In this paper, the process of glycidol synthesis form propylene alcohol and glycerol as basic raw material was reviewed, and the preparation of glycidol was systematically summarized, so as to provide reference for the subsequent research of glycidol.Abstract: The molecular structure of glycidol contains two highly active chemical functional groups, epoxy group and hydroxyl group, so it is very active and is a very useful chemical substance. It can be used as plastics, fiber modifiers, epoxy resin diluents, halogenated hydrocarbon stabilizers, food preservatives, fungicides, etc. In the pharmaceutical fi...Learn More
Abstract: Poly (styrene-butadiene-styrene) block copolymer (SBS) is the most common thermoplastic elastomer (TPE) used for modified asphalt. The unsaturated double bond of its polybutadiene block is prone to crosslinking and aging, which affects the performance and service life of modified asphalt. To solve this problem, acrylate soft monomers are used to replace butadiene, and hard monomers with high glass transition temperature (Tg) are used to replace styrene. Such new TPEs are designed to improve the chemical stability of the soft segment and improve the modification high and low temperature properties of asphalt. Firstly, the monomers used for flexible block and rigid block are screened out based on monomer price and Tg, and the polymerization method of each monomer is analyzed. Then, the polymerization methods and topological structures of block-type TPE prepared by rigid and flexible monomers are summarized and compared. The most suitable topological structure is linear or comb type. For linear TPE, a living polymerization method should be used, and each block is selected for copolymerization with monomers to adjust Tg. For comb-type TPE, the proposed synthetic route is: firstly prepare the telechelic graft chain, and then carry out free radical copolymerization. Finally, several schemes for the preparation of telechelic graft chains are proposed. A synthesis scheme of polyacrylate thermoplastic elastomer is proposed by summarizing the existing monomers, polymerization methods and initiator molecular structures, which provides a guideline for replacing SBS and for improving the comprehensive performance and service life of modified asphalt.Abstract: Poly (styrene-butadiene-styrene) block copolymer (SBS) is the most common thermoplastic elastomer (TPE) used for modified asphalt. The unsaturated double bond of its polybutadiene block is prone to crosslinking and aging, which affects the performance and service life of modified asphalt. To solve this problem, acrylate soft monomers are used to re...Learn More
Abstract: As one of the extremely rich polysaccharides in the world, chitin is also a material with excellent biocompatibility, biodegradable, green, non-toxic and harmless properties, so the new materials made of chitin are widely used in the food industry, biomedicine, health and safety and other fields. The development of new chitin materials has inhibited the use of traditional petroleum-based materials to some extent and improved the ecological environment. However, due to the defects of traditional extraction methods, the industrialization scale and commercialization of chitin are still in a bottleneck stage. This is due to the preparation of chitin new materials generally need to dissolve and extract it, and chitin has a high molecular weight, the existence of a large number of strong intermolecular hydrogen bonds makes it crystallinity high. At the same time, the structure of chitin is also relatively special due to its regular intermolecular arrangement, so chitin is difficult to melt and does not dissolve in water, alkaline solvents and most organic solvents.Therefore, in order to avoid the processing problems caused by chitin extraction, direct extraction and dissolved chitin extraction are introduced to prepare new materials, and proposed the development prospect of chitin.Abstract: As one of the extremely rich polysaccharides in the world, chitin is also a material with excellent biocompatibility, biodegradable, green, non-toxic and harmless properties, so the new materials made of chitin are widely used in the food industry, biomedicine, health and safety and other fields. The development of new chitin materials has inhibite...Learn More
