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Epoxy-based triblock, diblock, gradient and statistical copolymers of glycidyl methacrylate and alkyl methacrylates by nitroxide mediated polymerization
Reactive & Functional Polymers ( IF 5.1 ) Pub Date : 2021-08-14 , DOI: 10.1016/j.reactfunctpolym.2021.105008
Saeid Tajbakhsh 1 , Faezeh Hajiali 1 , Milan Marić 1
Affiliation  

A series of triblock, diblock, gradient and statistical copolymers of glycidyl methacrylate (GMA) and C13 methacrylates (C13MA, alkyl methacrylates with the average side-chain length of 13.0) were synthesized by nitroxide mediated polymerization (NMP) using Dispolreg 007 in 50 wt% dioxane at 90 °C. The polymers had the number average molecular weights (Mn) in the range of 23-46 kg mol−1 and dispersities (Đ) of 1.5–1.9. For the GMA/C13MA statistical copolymerization, reactivity ratios rGMA = 1.17 ± 0.09 and rC13MA = 0.65 ± 0.09 were determined. For statistical copolymers with GMA ratio (FGMA) of 0.5–0.8, the appearance of a melting point (Tm) at −43 to −19 °C and two glass transition temperatures (Tg) in the range of −53 to 11 °C indicated the possibility of micro-phase separation and a weak gradient polymerization. TGA showed ash content up to 13 wt% for GMA/C13MA copolymers at 600 °C, suggesting the possibility of high flame retardancy. Furthermore, a transition from elastic solid to viscous liquid behavior was detected by an oscillatory frequency sweep at 30 °C for triblock copolymers of GMA/C13MA (FGMA = 0.6–0.7, crossovers at 100–200 rad s−1) and gradient polymers with high GMA content (FGMA = 0.88, crossover at 10 rad s−1).



中文翻译:

甲基丙烯酸缩水甘油酯和甲基丙烯酸烷基酯的环氧基三嵌段、二嵌段、梯度和统计共聚物通过氮氧介导聚合

使用 Dispolreg 007 通过硝基氧介导聚合 (NMP) 合成了一系列甲基丙烯酸缩水甘油酯 (GMA) 和 C13 甲基丙烯酸酯 (C13MA,平均侧链长度为 13.0 的甲基丙烯酸烷基酯) 的三嵌段、二嵌段、梯度和统计共聚物,重量为 50 % 二恶烷在 90 °C。该聚合物的数均分子量(中号Ñ在23-46公斤mol的范围内)-1和分散度(Đ的1.5-1.9)。对于 GMA/C13MA 统计共聚反应,确定了反应性比率r GMA  = 1.17 ± 0.09 和r C13MA  = 0.65 ± 0.09。对于具有 GMA 比率 ( F GMA) 为 0.5–0.8,-43 至 -19 °C的熔点 (T m ) 和-53 至 11 °C 范围内的两个玻璃化转变温度 (T g ) 表明微相的可能性分离和弱梯度聚合。TGA 显示 GMA/C13MA 共聚物在 600 °C 时的灰分含量高达 13 wt%,表明具有高阻燃性的可能性。此外,对于 GMA/C13MA(F GMA  = 0.6–0.7,100–200 rad s -1 的交叉)和梯度聚合物的三嵌段共聚物,在 30 °C 下通过振荡频率扫描检测到从弹性固体到粘性液体行为的转变具有高 GMA 含量(F GMA  = 0.88,在 10 rad s -1处交叉)。

更新日期:2021-08-20
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