Polyester from dimethylketene and acetaldehyde: Direct copolymerization and β‐lactone ring‐opening polymerization
Polyester from dimethylketene and acetaldehyde: Direct copolymerization and β‐lactone ring‐opening polymerization
复制标题
二甲基乙烯酮和乙醛聚酯：直接共聚和β-内酯开环聚合
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
C. Bunel
中科院分区：
文献类型：
--
作者：
Marc Brestaz;N. Desilles;Guillaume Lê;C. Bunel
研究了以二甲基乙烯酮和乙醛为原料合成脂肪族聚酯的两种方法。一方面，在-60 °C的甲苯中进行直接阴离子共聚。所得聚合物主要由PE单元组成。另一方面，一个两步法，包括通过[2+2]环加成合成3，3，4-三甲基-2-氧杂环丁烷酮，然后其开环聚合，与各种引发剂和溶剂，导致预期的PE。获得了高达9000 g mol-1的分子量（通过核磁共振（NMR）测量），具有约1.2的窄的多分散性。发现这些聚合物在氮气下在高达274 °C下是稳定的，并且通过差示扫描量热法（DSC）在139 °C附近观察到归因于结晶度的宽且复杂的吸热峰。通过X射线衍射测量的结晶度接近0.45。© 2011 Wiley Periodicals，Inc.聚合物科学杂志A部分：聚合物化学，2011年
Two ways to obtain aliphatic polyesters (PEs) from dimethylketene and acetaldehyde were investigated. On the one hand, a direct anionic copolymerization was carried out in toluene at −60 °C. The resulting polymer was mainly composed of PE units. On the other hand, a two-step process involving the synthesis of 3,3,4-trimethyl-2-oxetanone by [2+2] cycloaddition, followed by its ring-opening polymerization, with various initiators and solvents, led to the expected PE. Molecular weights up to 9000 g mol−1 (measured by nuclear magnetic resonance (NMR)), with narrow polydispersity around 1.2, were obtained. These polymers were found stable up to 274 °C under nitrogen and a broad and complex endothermic peak attributed to crystallinity was observed near 139 °C by differential scanning calorimetry (DSC). The crystallinity, measured by X-ray diffraction, was close to 0.45. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011