Covalent integration of differently structured polyester polyols improves the toughness and strength of cationically polymerized, amorphous epoxy networks

Covalent integration of differently structured polyester polyols improves the toughness and strength of cationically polymerized, amorphous epoxy networks
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不同结构的聚酯多元醇的共价结合提高了阳离子聚合、无定形环氧网络的韧性和强度

DOI:
10.1002/app.43986
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发表时间:
2016
影响因子:
3
通讯作者:
A. Hartwig
A. Hartwig
中科院分区:
化学3区
文献类型:
--
作者:
A. Arnebold;S. Wellmann;A. Hartwig

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研究了阳离子聚合的无定形环氧基共聚物中聚酯多元醇的结构-性能关系。环氧树脂在结构不同的聚酯存在下聚合。这些所得共聚物显示出改善的拉伸强度和韧性。最佳环氧化物/聚酯比例取决于聚酯的结构。聚(δ-戊内酯)(PVL)显示了所研究的聚酯中最高的酯基密度,这增强了聚合过程中以及网络中与环氧化物的物理相互作用。此外,PVL还具有出色的拉伸强度、断裂应变和韧性。在所有聚酯多元醇中,PVL导致最高的凝胶分数,或者换句话说,最完全地整合到环氧网络中。这项工作表明,存在于反应体系中的聚酯应尽可能完全地共价结合到聚合物网络中,以获得良好的无定形共聚物的机械性能。© 2016 Wiley Periodicals,Inc. J.应用聚合物Sci.2016,133,43986.
The structure–property relationship of polyester polyols in cationically polymerized, amorphous epoxy‐based copolymers is investigated. An epoxy resin is polymerized in the presence of structurally different polyesters. These resulting copolymers show improved tensile strength and toughness. The optimal epoxide/polyester ratio depends on the structure of the polyesters. Poly(δ‐valerolactone) (PVL) reveals the highest ester group density of the investigated polyesters, which enhances physical interactions with the epoxide during polymerization as well as in the network. Furthermore, PVL leads to outstanding tensile strength, strain at break, and toughness. Among all polyester polyols examined, PVL leads to the highest gel fraction or, in other words, the most complete integration into the epoxy network. This work shows that polyesters that are present in the reactive system should be covalently integrated into the polymer network as completely as possible to obtain good mechanical properties of the amorphous copolymer. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2016,133, 43986.
DOI: --
发表时间: 1981
期刊:
影响因子: --
作者:
M. R. Tant;G. Wilkes
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