平项山
发表于 2025-3-23 12:15:55
Recent Advances in the Controlled Synthesis of Acrylic Polymers by Group Transfer Polymerization monomer to a growing chain end carrying a silyl ketene acetal group. During addition, the silyl group transfers to the incoming monomer regenerating a new ketene acetal function (Equation)..A catalyst is required for GTP to operate. Bifluoride salts, certain Lewis acids and a variety of oxyanions w
山间窄路
发表于 2025-3-23 16:14:32
Kinetics of Group Transfer Polymerization respect to monomer and catalyst concentrations. A slightly negative order with respect to initiator concentration is observed, indicating an inhibitive function of the initiator. Termination reactions occur at lower catalyst concentrations. They are very pronounced for TBMA and result in incomplete
Original
发表于 2025-3-23 21:15:56
Group Transfer Polymerization of Methyl Methacrylate with Basic Catalystslane (MTS) as initiator (I) was performed. The use of tris(dimethylamino)sulfonium difluorotrimethylsilicate (TASF.SiMe.), one of the most preferred catalysts of Du Pont, needs the addition of acetonitrile as solvent, which unfortunately reacts with the active centres in the presence of the catalyst
adulterant
发表于 2025-3-23 23:14:47
ALDOL-GTP in Controlled Synthesis of Vinyl Alcohol Polymers0-160,000)is controlled by the aldehyde initiator. The new process, termed aldol-group transfer polymerization (aldol-GTP) involves a silyl group transfer from monomer to the carbonyl oxygen of either the initiator or the living polymer, leading to generation of a new terminal aldehyde functional gr
柳树；枯黄
发表于 2025-3-24 02:35:25
Report of Discussions and Recommendationsgation. Miller’s group and Bandermann’s group are studying the overall rate of polymerization. Miller and Bandermann have encountered induction periods; Du Pont does not. To get better agreement, we need to purify monomer, solvents, initiators, and catalyst the same way and check each other’s experi
Obvious
发表于 2025-3-24 08:03:32
Controlled Synthesis of Various Poly(Alkyl Methacrylates) by Anionic TechniquesSmall variations in polymerization conditions have a profound influence on the nature of the propagating lithium enolate. However, the effects depend largely upon the size of the ester alkyl group involved. The delicate relationship among such variables as ester alkyl group size, polymerization temp
arthrodesis
发表于 2025-3-24 11:44:17
The Anionic Polymerization of Alkyl Acrylates : A Challengey enhancement promoted by cation-binding agents is well-documented, whereas complexing the well-known alkyllithium initiators to non reactive alkyl metals or metal alkoxides can affect the kinetics and improve the stereoregulation of the polymerization. Quite interestingly, some inorganic salts, suc
comely
发表于 2025-3-24 17:02:43
Stability of Active Centres in Polymerization - Methods of Study of Short-Lived Active Centresortant in radical and cationic polymerizations. The use of indirect methods (such as trapping of intermediates) and the direct detection of radicals (by e.s.r) and of carbocations (by UV spectrophotometry) are particularly discussed..In other lectures during this meeting the determination of active
Graduated
发表于 2025-3-24 21:45:09
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Acumen
发表于 2025-3-25 01:07:52
Living and ’Immortal’ Polymerizations of Epoxide with Metalloporphyrin Catalystlished. Successive polymerization of two or more epoxides results in the formation of block copolymer with polyether chains of controlled lengths. By taking advantage of the spectroscopic characteristics of porphyrin, the structure of the growing species of the polymerization can be investigated in