Rheological and physical properties of aliphatic hyperbranched polyesters
Rheological and physical properties of aliphatic hyperbranched polyesters
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DOI：
10.1002/polb.10671
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发表时间：
2004-04-01
影响因子：
--
通讯作者：
Månson, JAE
中科院分区：
文献类型：
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作者：
Luciani, A;Plummer, CJG;Månson, JAE
研究了以乙氧基化季戊四醇为核心，以2,2-二-（羟甲基）丙酸重复单元为基础的一系列超支化聚酯的大小（伪代数）和端基性质对其物理和流变性能的影响。在高伪代数极限下，熔体粘度与摩尔质量的线性关系表明纠缠效应基本不存在。此外，端基的端盖对物理和流变特性的显著影响表明，分子间的相互作用主要是由分子外壳之间的接触决定的，其中端基被认为是集中的。(C) 2004 Wiley期刊有限公司
The effects of the size (pseudo-generation number) and nature of end groups on physical and rheological properties were investigated for a series of hyperbranched polyesters based on an ethoxylated pentaerythritol core and 2,2-bis-(hydroxymethyl)propionic acid repeat units. The observed linear dependence of the melt viscosity on the molar mass in the high pseudo-generation-number limit indicated that entanglement effects were substantially absent. Moreover, the marked influence of end capping of the end groups on the physical and rheological properties suggested that intermolecular interactions were dominated by contacts between the outer shells of the molecules, in which the end groups were assumed to be concentrated. (C) 2004 Wiley Periodicals, Inc.