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Engineering Benzoxazine/Epoxy/Imidazole Blends with Controllable Microphase Structures for Toughness Improvement
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-07-06 , DOI: 10.1021/acsapm.0c00507 Jun Yue 1 , Lanqi He 2 , Pei Zhao 2, 3 , Yi Gu 3
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-07-06 , DOI: 10.1021/acsapm.0c00507 Jun Yue 1 , Lanqi He 2 , Pei Zhao 2, 3 , Yi Gu 3
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Toughness improvement of thermosetting benzoxazine (BZ) /epoxy (ER) blends is of great significance to expand their applications in the field of high-performance structural parts. Introduction of multiphase structures to the thermosetting blends via in situ reaction induced phase separation is a promising way to improve their toughness. However, the influences of the blend compositions on the phase separation and phase morphology as well as the thermal and mechanical properties of blends are still not clear. Here, we prepared a variety of BZ/ER/imidazole (MZ) ternary blending systems with different compositions and found that phase separation structures, including sea-island, cocontinuous, and phase-inversion morphologies, could be controlled by tuning the composition of ER resins and MZ. At a specific composition of ER resins, increasing the MZ content is prone to form phase separation structures, and the minimum MZ content needed for phase separation increased with the ER content. What is more, when the reactivity difference between BZ and ER (ΔEα) was larger than 40%, phase separation could occur. Finally, the introduction of multiphase morphologies significantly improved the impact strength and well maintained the thermomechanical properties of ternary blends.
中文翻译：
具有可控微相结构的工程苯并恶嗪/环氧/咪唑共混物，可改善韧性
热固性苯并恶嗪（BZ）/环氧（ER）共混物的韧性改善对扩展其在高性能结构零件领域的应用具有重要意义。通过原位反应诱导的相分离将多相结构引入热固性共混物中是提高其韧性的一种有前途的方法。然而，共混物组合物对相分离和相形态以及共混物的热和机械性能的影响仍然不清楚。在这里，我们制备了各种具有不同组成的BZ / ER /咪唑（MZ）三元共混系统，发现可以通过调节ER的组成来控制相分离结构，包括海岛，共连续和相转化形态树脂和MZ。在特定的ER树脂组成下，MZ含量的增加容易形成相分离结构，相分离所需的最小MZ含量随ER含量的增加而增加。此外，当BZ与ER之间的反应性差异（ΔÈ α）为大于40％，可能发生相分离。最后，多相形态的引入显着提高了冲击强度，并很好地保持了三元共混物的热机械性能。
更新日期：2020-08-14
中文翻译：
具有可控微相结构的工程苯并恶嗪/环氧/咪唑共混物，可改善韧性
热固性苯并恶嗪（BZ）/环氧（ER）共混物的韧性改善对扩展其在高性能结构零件领域的应用具有重要意义。通过原位反应诱导的相分离将多相结构引入热固性共混物中是提高其韧性的一种有前途的方法。然而，共混物组合物对相分离和相形态以及共混物的热和机械性能的影响仍然不清楚。在这里，我们制备了各种具有不同组成的BZ / ER /咪唑（MZ）三元共混系统，发现可以通过调节ER的组成来控制相分离结构，包括海岛，共连续和相转化形态树脂和MZ。在特定的ER树脂组成下，MZ含量的增加容易形成相分离结构，相分离所需的最小MZ含量随ER含量的增加而增加。此外，当BZ与ER之间的反应性差异（ΔÈ α）为大于40％，可能发生相分离。最后，多相形态的引入显着提高了冲击强度，并很好地保持了三元共混物的热机械性能。
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