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首页> 外文期刊>RSC Advances >Preparation of a P(THF-co-PO)-b-PB-b-P(THF-co-PO) triblock copolymer via cationic ring-opening polymerization and its use as a thermoset polymer
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Preparation of a P(THF-co-PO)-b-PB-b-P(THF-co-PO) triblock copolymer via cationic ring-opening polymerization and its use as a thermoset polymer

机译：通过阳离子开环聚合制备P（THF-CO-PO）-B-PB-B-B（THF-CO-PO）三嵌段共聚物及其作为热固性聚合物的用途

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The triblock copolymer poly(tetrahydrofuran-co-propylene oxide)-b-polybutadiene-b-poly(tetrahydrofuran-co-propylene oxide) [P(THF-co-PO)-b-PB-b-P(THF-co-PO)] was synthesized via the cationic ring-opening copolymerization of tetrahydrofuran (THF) and propylene oxide (PO) in the presence of hydroxyl-terminated polybutadiene (HTPB). The copolymerization mechanism was studied using Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR), and size-exclusion chromatography coupled with multi-angle laser light scattering (SEC-MALLS). The results showed both active chain end (ACE) and activated monomer (AM) mechanisms contribute to the chain propagation process to different extents, and the copolyether segments in the triblock copolymer had a gradient microstructure accordingly. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and viscosity testing results showed that the triblock copolymer had lower T-g than HTPB, low crystallization tendency and viscosity, and excellent thermal stability. To explore its potential applications, the triblock copolymer was used to prepare elastomer by the thermosetting process. Dynamic thermomechanical analysis (DMA) and tensile test results indicated that the triblock copolymer based elastomer had lower T-g, as well as dramatically higher tan delta value and elongation at break, than HTPB based elastomer because of the introduction of copolyether segments.
机译：三嵌段共聚物聚（四氢呋喃 - 共环氧丙烷）-B-聚丁二烯-B-聚（四氢呋喃 - 共环氧丙烷）[P（THF-CO-PO）-B-PB-BP（THF-CO-PO）通过在羟基封端的聚丁二烯（HTPB）存在下通过阳离子开环共聚合成四氢呋喃（THF）和环氧丙烷（PO）。使用傅里叶变换红外光谱（FT-IR），核磁共振（NMR），核磁共振（NMR）和与多角度激光散射（SEC-MALLS）相结合的核磁共振（NMR）进行研究。结果表明，活性链末端（ACE）和活化单体（AM）机制有助于将链繁殖过程转化为不同的范围，并且三嵌段共聚物中的共聚醚区段相应地具有梯度微结构。差示扫描量热法（DSC），热重分析（TGA）和粘度测试结果表明，三嵌段共聚物的T-G具有比HTPB，低结晶趋势和粘度，以及优异的热稳定性。为了探讨其潜在的应用，三嵌段共聚物用于通过热固性方法制备弹性体。动态热机械分析（DMA）和拉伸试验结果表明基于三嵌段共聚物的弹性体具有较低的T-g，并且由于引入共同聚醚段而比HTPB的弹性体显着更高的Tan delta值和伸长率。

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