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10 results about "Living anionic polymerization" patented technology
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Living anionic polymerization is a living polymerization technique involving an anionic propagating species. Living anionic polymerization was demonstrated by Szwarc and co workers in 1956. Their initial work was based on the polymerization of styrene and dienes. One of the remarkable features of living anionic polymerization is that the mechanism involves no formal termination step. In the absence of impurities, the carbanion would still be active and capable of adding another monomer. The chains will remain active indefinitely unless there is inadvertent or deliberate termination or chain transfer. This gave rise to two important consequences: The number average molecular weight, Mₙ, of the polymer resulting from such a system could be calculated by the amount of consumed monomer and the initiator used for the polymerization, as the degree of polymerization would be the ratio of the moles of the monomer consumed to the moles of the initiator added. , where Mₒ = formula weight of the repeating unit, [M]ₒ = initial concentration of the monomer, and [I] = concentration of the initiator. All the chains are initiated at roughly the same time.
Active anionic polymerization initiation system based on alkyl magnesium reagent and polymerization method
The invention discloses an alkyl magnesium reagent-based active anionic polymerization initiation system and a polymerization method, and belongs to the technical field of polymer synthesis. A novel initiation system based on an alkyl magnesium reagent is developed, controllable anionic polymerization of various electron-withdrawing monomers is realized by accurately regulating and controlling reaction conditions and alkyl magnesium substituent structures, and a series of magnesium polymers with controllable molecular weight distribution are successfully synthesized. The polymerization process shows typical living polymerization characteristics, the block copolymer with a regular structure is prepared through a sequential feeding strategy, modification of multiple functional end groups can be achieved, and a new technical approach is provided for designing and synthesizing high polymer materials with specific performance. A novel alkyl magnesium initiating system which is low in cost and easy to operate is provided for active anionic polymerization, the limitation of a traditional initiating system is broken through, the magnesium polymer with magnesium ions at the tail end is synthesized, a new technical path is provided for controllable preparation of high polymer materials, and important theoretical significance and wide industrial application prospects are achieved.
Owner:DALIAN UNIV OF TECH
Long-acting antibacterial high-melting-point SEEPS as well as preparation method and application thereof
PendingCN121427038ACatalyst activation/preparationMetal/metal-oxides/metal-hydroxide catalystsPolymer scienceAntibacterial property
The invention provides long-acting antibacterial high-melting-point SEEPS as well as a preparation method and application thereof, and belongs to the technical field of functional polymer materials. The SEEPS is an amino functionalized styrene-(ethylene / propylene / butylene)-styrene triblock polymer, which is obtained by hydrogenating an amino functionalized styrene-butadiene / isoprene-styrene triblock polymer (SIBS), and is called SEEPS for short. According to the invention, lithium alkyl is used as an initiator, an amido functionalized polar comonomer DPE-Ugi, styrene, butadiene and isoprene are used as comonomers, SIBS is prepared based on an active anionic polymerization mechanism, and SEEPS is obtained through selective hydrogenation on the basis; an amino functionalized polar comonomer DPE-Ugi is introduced into the SEEPS, so that the SEEPS is endowed with a long-acting antibacterial property; the SEEPS has longer polyethylene length, high melting temperature and stronger mechanical property; sEEPS has good ductility, can be processed and formed through methods of injection molding, compression molding and the like, and has better applicability in the medical aspect.
Owner:DALIAN UNIV OF TECH +1
Core-arm structure synthesis method of polyfunctional group-terminated vinyl silicone oil
The invention discloses a core-arm structure synthesis method of polyfunctional group-terminated vinyl silicone oil, and belongs to the field of functional organosilicon polymer synthesis. The method comprises the following three core processes: preparing a polyvinyl POSS core polymer through active anionic polymerization under anaerobic and anhydrous conditions; initiating double-bond metallization by using lithium alkylide to generate a multifunctional macromolecular initiator; vinyl-terminated siloxane monomers are added for polymerization to form a star-shaped structure with POSS as a core and silicone oil chain segments as arms, and the performance can be optimized through block extension and purification processes. Parameters such as initiator proportion, reaction temperature and time are regulated and controlled through a quantitative formula, and the problems of uneven structure, low bonding efficiency and the like of a traditional method are solved. The product molecular weight distribution PDI is smaller than or equal to 1.2, the bonding efficiency is larger than or equal to 95%, the vinyl density is improved by 3-5 times, the process is mild, the performance can be customized, and the method is suitable for multiple fields of sealants, pouring sealants and the like.
Owner:XINJIANG HESHENG SILICON NEW MATERIAL CO LTD
1, 2-dihydronaphthalene derivative copolymer synthesized based on active anion polymerization and preparation method of 1, 2-dihydronaphthalene derivative copolymer
A 1, 2-dihydronaphthalene derivative copolymer synthesized based on active anion polymerization and a preparation method thereof belong to the technical field of high polymer materials, are synthesized based on an active anion polymerization mechanism, and are formed by copolymerization of a 1, 2-dihydronaphthalene derivative, a styrene derivative and a diene monomer. The 1, 2-dihydronaphthalene derivative is 1, 2-dihydronaphthalene and functionalized 1, 2-dihydronaphthalene with a substituent group on an aromatic ring or an aliphatic ring; the styrene derivative is styrene, alpha-methyl styrene, 1, 1-diphenylethylene and a chain segment formed by mutual polymerization of the monomers; the dialkene monomer is butadiene, isoprene, 2, 3-dimethyl-1, 3-butadiene and a chain segment formed by mutual polymerization of the dialkene monomer, the isoprene and the 2, 3-dimethyl-1, 3-butadiene. According to the invention, binary and ternary copolymerization of various monomers with similar structures but different performances is realized; the polymerization condition is mild, the copolymer with controllable molecular weight and distribution is easy to obtain, and the performance and application range of synthetic resin and synthetic rubber are further expanded.
Owner:DALIAN UNIV OF TECH
Poly (p-hydroxystyrene) resin as well as preparation method and application thereof
PendingCN120829531APhotosensitive materials for photomechanical apparatusPolymer sciencePotassium tert-butoxide
The invention provides poly (p-hydroxystyrene) resin as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out active anionic polymerization reaction on a compound monomer shown in a formula I under the action of a ligand to obtain a prepolymer; the prepolymer is hydrolyzed; the ligand is potassium tert-butoxide; the reaction temperature of the active anionic polymerization reaction is 20-25 DEG C. The molecular weight MW of the poly (p-hydroxystyrene) resin obtained by the preparation method is 29000-30000, the molecular weight is controllable, and the poly (p-hydroxystyrene) resin has lower molecular weight distribution index, metal impurity content, organic impurity content and water content; moreover, the monomer conversion rate is stabilized to be greater than or equal to 95%, the same molecular weight and molecular weight distribution index of the poly-p-hydroxystyrene resin produced in each batch can be ensured, and the use requirements of KrF photoresist resin are met.
Owner:SHANGHAI JIECAI MICROELECTRONICS MATERIALS TECH CO LTD
Star-branched butyl rubber and a method for preparing the same
This invention provides a method for preparing star-shaped branched butyl rubber, comprising the following steps: A) Styrene and its derivatives, a nitrogen-lithium initiator, a polarity modifier, and a solvent are mixed and reacted, and then butadiene is added to continue the reaction to obtain an SBS branching agent; B) SBS is catalytically hydrogenated, controlling the degree of hydrogenation to 20%~70%, to obtain a partially hydrogenated SBS branching agent; C) The partially hydrogenated SBS branching agent is dissolved in a solvent, mixed with isobutylene and isoprene, and an initiator is added to carry out a polymerization reaction to obtain the desired product. This invention uses living anionic polymerization technology to prepare block copolymers of styrene and its derivatives with butadiene, and partially hydrogenates them through catalytic hydrogenation. By controlling the catalyst / polarity modifier ratio, a branching agent with a specific degree of hydrogenation is synthesized. Then, the branching agent is dissolved in dichloromethane for the preparation of butyl rubber, resulting in star-shaped branched butyl rubber with a bimodal broad molecular weight distribution.
Owner:SHANDONG CHAMBROAD SINOPOLY NEW MATERIAL CO LTD
Synthesis of a positive chemical amplification photoresist resin, and preparation method and application thereof
This invention provides a positive chemical amplification photoresist resin synthesis method and its application. The positive chemical amplification photoresist resin has a specific structure, and its synthesis method involves obtaining a polymer with the corresponding structure through active anionic polymerization. This resin can improve problems such as tilted sidewalls and low resolution in photoresist after development, thereby meeting higher photolithography requirements.
Owner:WANHUA CHEM GRP CO LTD
A method for efficient polymer chain end functionalization based on carbon-magnesium / carbon-zinc bond and its application
This invention relates to a highly efficient polymer chain-end functionalization method based on carbon-magnesium / carbon-zinc bonds and its applications, belonging to the field of polymer synthesis technology. Step 1: Using living anionic polymerization, a polymer precursor with carbon-lithium or carbon-sodium bonds at the chain ends is synthesized. Step 2: Alkyl magnesium halide or alkyl zinc halide is added to the polymer precursor, causing a metal transfer reaction between the carbon-lithium or carbon-sodium bonds at the polymer precursor ends and the alkyl magnesium halide or alkyl zinc halide, yielding a polymer solution with C-Mg / C-Zn bonds at the ends. Step 3: The polymer is reacted with a specific end-capping agent to precisely introduce functional groups at the chain ends, achieving mild, efficient, and controllable end-group functionalization modification of the polymer. This invention can generate well-defined and relatively stable C-Mg or C-Zn bonds in situ at the polymer chain ends. The C-Mg / C-Zn bonds exhibit significantly enhanced resistance to air and moisture. By precisely controlling the reaction conditions and introducing a specific end-capping agent, highly efficient functionalization of the polymer chain ends can be achieved under mild conditions.
Owner:DALIAN UNIV OF TECH
PHS resin as well as preparation method and application thereof
The invention provides PHS resin as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out active anionic polymerization reaction on a monomer under the action of an initiator to obtain a prepolymer; the prepolymer is hydrolyzed; the monomer is p-tert-butoxy styrene. The molecular weight MW of the PHS resin obtained by the preparation method is 29000-30000, the molecular weight is controllable, and the PHS resin has lower molecular weight distribution index, metal impurity content, organic impurity content and water content; moreover, the monomer conversion rate is stabilized at 100%, the same molecular weight and molecular weight distribution index of PHS resin produced in each batch can be ensured, and the use requirements of KrF photoresist resin are met.
Owner:SHANGHAI JIECAI MICROELECTRONICS MATERIALS TECH CO LTD
Tailored coupling of anionic block copolymers for an increased balance between hardness and thermal stability
The invention relates to a method for the preparation of a polymer product (P1) by living anionic polymerization, wherein a coupling agent (C) and optionally a terminating agent (T) are used to form coupled polymer chains (P-P) and terminated polymer chains (P). The obtained polymer product (P1) typically has lower Shore hardness, higher Vicat softening temperature or a combination thereof compared with polymer products having a similar melt volume rate and molecular weight, but prepared by unidirectional anionic polymerization.
Owner:INEOS STYROLUTION GRP GMBH