
异丁基乙烯基醚活性阳离子聚合催化剂的重大进展:各种常规金属 …
使用多种金属卤化物检查了异丁基乙烯基醚(ibve)的阳离子聚合。 在适当的添加的碱,酯或醚的存在下,IBVE的活性聚合进行的几乎所有的路易斯酸(MCL Ñ ; M:铁,镓,锡,铟,锌,铝,铪,锆,铋,钛, Si,Ge,Sb)与IBVE-HCl加合物一起在0°C的甲苯中使用。
Major Progress in Catalysts for Living Cationic Polymerization of ...
Cationic polymerization of IBVE was performed using a variety of metal halides (Chart 1) in conjunction with IBVE−HCl as a cationogen in toluene at 0 °C ([IBVE] 0 = 0.76 M, [IBVE−HCl] 0 = 4.0 mM, [metal halide] 0 = 5.0 mM).
Precise synthesis of poly (IBVE- - ScienceDirect
2020年3月2日 · Achieve fast living cationic copolymerization in a microflow platform. Exhibit controllable LCST behavior and tunable Tps from 22.5 to 38.5 °C. A new type of thermosensitive copolymers composed of isobutyl vinyl ether (IBVE) units and 4-hydroxybutyl vinyl ether (HBVE) units were synthesized within 4.34 s in a microflow platform.
Fast living cationic polymerization of isobutyl vinyl ether …
2019年4月1日 · In this work, we attempted to develop fast living cationic polymerization of isobutyl vinyl ether (IBVE) tailored by reduced single nucleophile in microflow system. Living polymers were successful obtained for the systems of IBVE-HCl/FeCl3 ·DO/DO and …
Controlled microflow cationic polymerization of vinyl ethers under ...
2022年5月1日 · Here, we report a facile strategy for simplifying the strict conditions required for traditional living cationic polymerizations of various vinyl ethers including ethyl vinyl ether (EVE), propyl vinyl ether (PVE), butyl vinyl ether (BVE) and isobutyl vinyl ether (IBVE) by utilizing continuous microflow reactors and a weak Lewis acid, zinc ...
使用各种反阴离子使阳离子 RAFT 聚合多样化:从有机卤化物和各 …
使用弱或非配位的 BArF 阴离子和三硫代碳酸盐,获得了具有窄分子量分布 ( M w / M n < 1.1) 的几乎无规立构的聚 (IBVE)。 当使用非氧阴离子时,例如 SbF 6 –、PF 6 –和 BArF –, 在硫醚的存在下, αMS 的受控阳离子聚合得以实现, 而使用 TfO –发生频繁的不可逆 β-质子 ...
Anion-binding catalysis enables living cationic polymerization
2022年8月29日 · In our approach, selenocyclodiphosph (V)azanes were designed as bench-stable hydrogen-bond donors to reversibly activate dormant covalent bonds (C–X, X=Cl, carboxylate and phosphate), in turn to...
异丁基乙烯基醚的卤素键介导和受控阳离子聚合:扩大2-碘咪唑鎓 …
IBVE的HCl加合物是最合适的引发剂,和聚合反应在-1010μm的催化剂浓度下进行℃下 米 抑制醇消除从聚合物链中。 少量添加 n Bu 4 NCl(0.02当量)可有效地完成受控的阳离子聚合并获得分子量分布低于1.3的聚IBVE。
Living cationic polymerization of isobutyl vinyl ether using a …
2010年1月12日 · Cationic polymerization of isobutyl vinyl ether (IBVE) was examined using a variety of metal oxides in conjunction with IBVE–HCl adduct as a cationogen in toluene at 0 °C. Iron oxides (α-Fe 2 O 3 , γ-Fe 2 O 3 , and Fe 3 O 4 ) induced living polymerization in the presence of an added base, ethyl acetate or 1,4-dioxane, to give polymers with ...
Understanding the effects of nucleophiles in fast living cationic ...
In this work, taking the polymerisation of isobutyl vinyl ether (IBVE) as an example, the effects of various nucleophiles, namely ethyl acetate, 1,4-dioxane, 1,3-dioxolane, diethyl ether, and ethyl propionate, on the activity and stability of the propagating chains were systematically examined in a microflow system, in which IBVE-HCl/SnCl 4 was ...