Polyhydroxyurethane thermosets from novolac epoxide: Synthesis and its nanostructured blends with poly(trifluoroethylacrylate)-block-poly (N-vinylpyrrolidone) diblock copolymer
Polyhydroxyurethane thermosets from novolac epoxide: Synthesis and its nanostructured blends with poly(trifluoroethylacrylate)-block-poly (N-vinylpyrrolidone) diblock copolymer
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来自酚醛环氧树脂的聚羟基聚氨酯热固性材料：合成及其与聚（丙烯酸三氟乙酯）-嵌段-聚（N-乙烯基吡咯烷酮）二嵌段共聚物的纳米结构共混物
DOI：
10.1016/j.polymer.2020.123314
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发表时间：
2021-01-20
期刊：
影响因子：
4.6
通讯作者：
Zheng, Sixun
中科院分区：
文献类型：
--
作者：
Li, Lei;Ge, Wenming;Zheng, Sixun
以酚醛环氧树脂和二氧化碳为原料，合成了一种新型五元环状碳酸酯化合物。然后将环状碳酸酯用作前体以制备具有三官能聚醚胺（即，Jeffamine T 403）作为交联剂。为了改善热机械性能以及疏水性，PHU热固性材料通过使用聚（丙烯酸三氟乙酯）-嵌段-聚（N-乙烯基吡咯烷酮）（PTFEA-b-PVPy）二嵌段共聚物进一步纳米结构化。与普通PHU热固性材料相比，纳米结构热固性材料显示出增强的玻璃化转变温度（T-g）和机械性能。同时，表面疏水性得到了显著改善，热固性材料的水表面接触角增加到94.6度。随着PTFEA-b-PVPy的引入，纳米结构的PHU热固性材料在高温下仍然保留了优异的形状记忆和可再加工性。
A novel five-membered cyclic carbonate compound was synthesized via the reaction of novolac epoxide with carbon dioxide. The cyclic carbonate was then used as the precursor to prepare polyhydroxyurethane (PHU) thermosets with a trifunctional polyetheramine (i.e., Jeffamine T 403) as the crosslinking agent. To improve the thermomechanical properties as well as hydrophobicity, the PHU thermosets were further nanostructured by the use of a poly(trifluoroethyl acrylate)-block-poly(N-vinylpyrrolidinone) (PTFEA-b-PVPy) diblock copolymer. Compared to plain PHU thermoset, the nanostructured thermosets displayed enhanced glass transition temperatures (T-g's) and mechanical properties. Meanwhile, the surface hydrophobicity was significantly improved; the water surface contact angles of the thermosets have been increased up to 94.6 degrees. With the introduction of PTFEA-b-PVPy, the nanostructured PHU thermosets still preserved the excellent shape memory and reprocessability at elevated temperature.