Effect of Annealing on the Rheological and Thermal Properties of Aliphatic Hyperbranched Polyester Based on 2,2-Bis(methylol)propionic Acid
Effect of Annealing on the Rheological and Thermal Properties of Aliphatic Hyperbranched Polyester Based on 2,2-Bis(methylol)propionic Acid
复制标题
退火对2,2-双羟甲基丙酸脂肪族超支化聚酯流变学和热性能的影响
DOI：
--
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
A. Zupancic
中科院分区：
文献类型：
--
作者：
E. Žagar;M. Huskić;J. Grdadolnik;A. Zigon;A. Zupancic
研究了退火对2,2-双（甲基）丙酸（Boltorn H40）第四代超支化聚酯多元醇h键结构重排的影响及其对热性能和流变性能的影响。随着退火时间的延长和温度的降低，Boltorn H40的DSC热图中吸热转变焓增大，粘弹性响应有较大的弹性贡献。非晶态Boltorn H40在退火过程中，由于形成了多个分子间氢键(−OH…OC <和/或−OH…−OH)在长线性序列之间的超支化结构。对Boltorn H40的各个组分和理想结构的树状大分子类似物的DSC、FTIR和XRD结果表明，在低摩尔质量的开放结构和低分支度的超支化物种中，结构的有序性最高。这样的物种有最长的……
We investigated the effects of annealing on the rearrangement of H-bonding structure and its influence on the thermal and rheological properties of a fourth-generation hyperbranched polyester polyol based on 2,2-bis(methylol)propionic acid (Boltorn H40). With increasing annealing time and decreasing temperature, the enthalpy of the endothermic transition in the DSC thermograms of Boltorn H40 increases, whereas the viscoelastic response shows a considerable elastic contribution. During annealing of amorphous Boltorn H40, its structure becomes more ordered as a consequence of formation of multiple intermolecular H-bonds (−OH...OC〈 and/or −OH...−OH) between long linear sequences in the hyperbranched structure. DSC, FTIR, and XRD results of the individual fractions of Boltorn H40 and an ideally structured dendrimer analogue show that the ordering of the structure is highest in the case of low molar mass hyperbranched species with an open structure and low degree of branching. Such species have the longest ave...