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首页> 外文期刊>Journal of Applied Polymer Science >The effects of chemical structure on the shear rheology of aliphatic polycarbonates
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The effects of chemical structure on the shear rheology of aliphatic polycarbonates

机译：化学结构对脂肪族聚碳酸酯剪切流变学的影响

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Aliphatic polycarbonates are a relatively new class of polymer, which are characterized by an instability at the functional group, which makes them easily degraded and capable of biodegradation; as such, they constitute a potentially powerful group of polymers for exploitation in green technology. Rheological properties in shear flow are presented for the seven following different aliphatic polycarbonate samples: polyethylene carbonate, polypropylene carbonate, linear pentene polycarbonate, linear hexene polycarbonate, linear octene polycarbonate, cyclohexene polycarbonate, copolymer of propylene oxide (20%), and cyclohexene oxide (80%), using parallel plate rheometry. No studies of the rheological properties of aliphatic polycarbonates have been reported in the literature to date. The steady-state and the dynamic properties of these new polymers are investigated, and the resulting flow curves and the dynamic relaxation spectra of the aliphatic polycarbonate melts are presented. One of the major problems encountered in trying to characterize the melt rheology and relate behavior to the underlying molecular structure is the instability of the polymers. Because of this, a narrow processing window is present for each polymer, and it makes it impossible to compare all polymers at a constant temperature or range of temperatures in the melt. Nevertheless, some progress can be made. In all cases, the rheological response is discussed in terms of molecular characteristics, in particular, the length of the side chain and the molecular weight distribution. (C) 2004 Wiley Periodicals, Inc.
机译：脂肪族聚碳酸酯是一类相对较新的聚合物，其特征在于官能团的不稳定性，这使其易于降解并能够生物降解。因此，它们构成了潜在的强大聚合物组，可用于绿色技术中。给出了以下七个不同的脂肪族聚碳酸酯样品的剪切流变特性：聚碳酸亚乙酯，碳酸亚丙酯，线性戊烯聚碳酸酯，线性己烯聚碳酸酯，线性辛烯聚碳酸酯，环己烯聚碳酸酯，环氧丙烷共聚物（20％）和环氧丙烷（ 80％），使用平行板流变仪。迄今为止，尚未有文献报道脂族聚碳酸酯的流变性能研究。研究了这些新型聚合物的稳态和动态特性，并给出了所得的脂肪族聚碳酸酯熔体的流动曲线和动态弛豫谱。试图表征熔体流变学并将行为与潜在的分子结构联系起来遇到的主要问题之一是聚合物的不稳定性。因此，每种聚合物存在狭窄的加工窗口，并且不可能在恒定温度或熔体温度范围内比较所有聚合物。但是，可以取得一些进展。在所有情况下，均根据分子特性，尤其是侧链的长度和分子量分布来讨论流变响应。 （C）2004年Wiley Periodicals，Inc.

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