Structure-to-properties relationship of aliphatic hyperbranched polyesters

被引:48
作者
Zagar, Ema [1 ]
Huskic, Miroslav [1 ]
Zigon, Majda [1 ]
机构
[1] Natl Inst Chem, SI-1000 Ljubljana, Slovenia
关键词
hyperbranched; polyesters; structure-property relations; thermal properties; viscoelastic properties;
D O I
10.1002/macp.200600672
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
We investigated the effects of annealing on the rearrangement of the H-bond network microstructure and its influence on the thermal and rheological properties of the second pseudo-generation hyperbranched (HB) polyester based on 2,2-bi.s(methylol)propionic acid (Boltorn H20) in comparison to the fourth pseudo-generation HB polyester (Boltorn H40). During annealing the hydroxyl groups of HB polyesters form H-bonds with other hydroxyl or carbonyl groups. The formation of -OH...-OH H-bonds is favored at shorter annealing times, higher annealing temperatures, and for low pseudo-generation HB polyester, which has a low average molar mass, degree of branching, and core functionality. At temperatures up to 80 degrees C, Boltorn H20 indicates faster and more extensive H-bond formation as compared to Boltorn H40. This is reflected in its larger cleavage enthalpies and higher elastic contribution to the viscoelastic response. At 90 degrees C and above, the process of H-bond formation is delayed. Therefore, Boltorn H20 exhibits only viscous behavior in rheological measurements, and in DSC curves it shows strong exothermic transitions while heating the sample.
引用
收藏
页码:1379 / 1387
页数:9
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